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Xin Liu,1,* Miao Tang,2,* Tian-Yi He,1 Shuang Zhao,1 Hui-Zhou Li,1 Zhao Li,1 Yue-Xian Guo,3 Xiu-Li Wang1 1Department of Anesthesiology, The Third Hospital of Hebei Medical University, Shijiazhuang, Hebei, 050051, People’s Republic of China; 2Department of General Surgery, The Second Hospital of Hebei Medical University, Shijiazhuang, Hebei, 050000, People’s Republic of China; 3Department of Surgery, The Third Hospital of Hebei Medical University, Shijiazhuang, 050051, People’s Republic of China*These authors contributed equally to this workCorrespondence: Xiu-Li Wang, Department of Anesthesiology, The Third Hospital of Hebei Medical University, No. 139 Ziqiang Road, Shijiazhuang, Hebei, 050051, People’s Republic of China, Tel +86-13313019968, Email wangxl311@126.comObjective: This study aimed to investigate the effect of resveratrol (Res) on paclitaxel (PTX)-induced cognitive impairment and elucidate the underlying molecular mechanisms.Methods: Morris Water Maze (MWM) test was used to evaluate the mice’s spatial learning and memory abilities. Western blotting was applied to detect protein expression of receptor-interacting protein (RIP3), mixed lineage kinase domain-like protein (MLKL), silencing information regulator 2 related enzyme 1 (SIRT1), peroxisome proliferator activated receptor coactivator-1 (PGC-1α), NADPH oxidase 2 (NOX2), NOX4, postsynaptic density zone 95 (PSD95), arginase-1 (Arg-1) and inducible nitric oxide synthase (iNOS). Immunofluorescence of RIP3, MLKL, Arg-1, Iba-1 and iNOS was conducted to observe the apoptosis of hippocampal cells and the polarization of microglia. qRT-PCR was performed to detect BDNF mRNA expressions. DHE staining was used to assess the level of oxidative stress response. Golgi-Cox staining and dendritic spine counting were applied to visualize synaptic structural plasticity. Postsynaptic density was performed by transmission electron microscope. ELISA was used to detect the contents of tumour necrosis factor alpha (TNF-α), IL-1β, IL-4, and IL-10.Results: PTX-induced cognitive impairment model was constructed after the application of PTX, represented as longer latency to platform and less platform crossing times over the whole period in PTX group. After Res treatment, the above indicators were reversed, indicating that cognitive function was improved. Moreover, Res reduced neuronal apoptosis and oxidative stress through SIRT1/PGC-1α pathway in mice, manifesting as down-regulated expression of RIP3, MLKL, NOX2 and NOX4. Meanwhile, Res increased the density of dendritic spines and the expression of PSD95 and BDNF, thereby ameliorating the PTX induced synaptic damage. Besides, M2 microglia was in the majority, eliciting the expression of anti-inflammatory cytokines IL-4 and IL-10 after Res treatment in PTX+Res group, while immunofluorescence images results demonstrated an decrease in the proportion of M2 microglia a following SIRT1 inhibitor EX-527.Conclusion: Res improves PTX-induced cognitive impairment in mice by activating SIRT1/PGC-1α pathways to regulate neuronal state and microglia cell polarization.Keywords: resveratrol, paclitaxel, SIRT1/PGC-1α, microglia, M2 polarization

Depending on the in situ ligand transformation of 3,5-di(1,2,4-triazol-1-yl)benzonitrile (DTCN) to 3,5-di(1,2,4-triazol-1-yl)benzoic acid (DTCA) under hydrothermal condition, three polyoxometalate-based copper complexes, [CuI 4CuII 2(OH)2(H2O)4(DTCA)4(HPMoVI 10MoV 2O39)] (1), [Cu4(OH)2(H2O)4(DTCA)2(SiW12O40)]·11H2O (2), and {Cu2Cl(H2O)(HDTCA)2[CrMo6(OH)6O18)]}·4H2O (3), have been isolated through changing the polyoxoanions. Introducing Keggin-type polyoxoanions [PMo12O40]3− or [SiW12O40]4− to reaction systems, both 1 and 2 display 3-D framework structures containing Cu/DTCA metal-organic belts, and a kind of poly-Keggin chain derived from [PMo12O40]3− polyoxoanions exist in 1. When the Anderson-type polyoxoanion [CrMo6(OH)6O18)]3− is utilized, a 2-D grid-like layer resulted in 3, in which the DTCA ligands are embedded, revealing that the polyoxoanions have key roles in regulating the structures of complexes. The investigations on electrochemical properties and photocatalytic activities for the degradation of organic dyes of 1–3 have been carried out.

Three new polyoxometalate (POM)-based metal–organic complexes, {Ni3(Hpytty)2[AlMo6(OH)5O19](H2O)4(CH3O)}·5H2O (1), {Ni3(Hpytty)2 [CrMo6(OH)5O19](H2O)10}·6H2O (2), and {Co2(pytty)[γ-Mo8O26]0.5 (H2O)...

Two multifunctional metal-organic coordination polymers, namely, [Cu(4-bpah)(2,6-PDA)] (1) and [Cu(4-bpah)(3-NIP)]·H2O (2), where 4-bpah = N, N′-bis(4-pyridinecarboxamide)-1,2-cyclohexane, 2,6-H2PDA = pyridine-2,6-dicarboxylic acid, 3-H2NIP = 3-nitrophalic acid, have been hydrothermally synthesized and structurally characterized by IR, TG, and single crystal X-ray diffraction analyses. Complex 1 is a 1D infinite helix chain structure. Complex 2 possesses a 2D polymeric layer containing two kinds of meso-helical chains: [Cu-4-bpah]n and [Cu-3-NIP]n. The adjacent 1D chains for 1 or the adjacent 2D layers for 2 are further linked by hydrogen bonding interactions to form 2D or 3D supramolecular networks, respectively. The fluorescent, electrochemical and photocatalytic properties of complexes 1-2 have also been investigated.

Liquid chromatograph-mass spectrometer (LC/MS) based labeled with isobaric mass tags for relative and absolute quantitation (iTRAQ) analyses were performed to identify differentially expressed proteins from normal and cancerous human colorectal tissues. Around 802 proteins were identified, 68 proteins of which were defined as differentially expressed proteins. Bioinformatics analysis indicated that these differentially expressed proteins correlated with several specific cellular processes and pathways which have relationships with pathological changes of colorectal cancer (CRC). EHD2 were selected to verify its expression patterns and localization using western blotting and immunohistochemistry respectively. LC/MS-based iTRAQ proteomic approach would provide new information about the character of CRC.

Three copper(II) isomers, [Cu(dtcd)(DNBA)2]n (1–3) (HDNBA = 3,5-dinitrobenzoic acid, dtcd = N,N-di(4H-1,2,4-triazole)cyclohexane-1,4-dicarboxamide), were synthesized in a one-pot reaction, and structurally characterized. Polymer 1 shows a 1-D single chain in which dtcd connect adjacent Cu2+ ions, while DNBA− is monodentate. In 2, every two Cu2+ ions are linked by carboxylate of a DNBA− in a chelate-bridging mode into a binuclear unit, which is further connected by dtcd ligands into a 1-D double chain. In 3, dtcd connect Cu2+ ions via triazole nitrogens to generate 1-D single chains, which are further extended into a 2-D network by the amide oxygens of a dtcb from an adjacent chain. The pH plays an important role in product distribution of 1–3. The coordination behaviors of dtcd and DNBA− also influence the final structures. Luminescent properties of 1–3 have been investigated.

A Keggin-type polyoxometalate (POM)-based complex, [Ag5(L)3 (H2O)2]·6H2O (1) (L = N,N′-bis(3-pyridinecarboxamide)-1,2-ethane), has been hydrothermally synthesized. Compound 1 shows a 3D + 3D interpenetrating network with a (3,4,4,4)-connected (4 × 62)2(42 × 62 × 82)(65 × 8)2 topology, and it represents the first example of interpenetrating POM-based complex based on flexible bis-pyridyl-bis-amide ligands. Moreover, the electrochemical behavior and luminescence of 1 have been investigated.

A new organopolymolybdate polymer, [Zn2(H2biim)4(Hbiim)2][H2(γ-Mo8O26)]·8H2O (1) (H2biim = 2,2′–biimidazole), was synthesized under hydrothermal conditions. In 1, H2biim has chelate and linking roles. Three H2biim chelate one Zn to form a cationic metal-organic subunit; two subunits link one octamolybdate through Mo–N bonds, forming a two-supporting anion. There are abundant π…π stacking interactions between these anions inducing a 1-D supramolecular chain. The electrochemical behavior and photoluminescence of 1 have been studied.

Two metal–organic coordination polymers, [Cu3(4-bpcb)2(1,2,4-btc)2(H2O)2] (1) and [Cu3(3-bpcb)3(btec)1.5] (2), have been synthesized from hydrothermal reaction of copper chloride with mixed ligands [4-bpcb = N,N′-bis(4-pyridinecarboxamide)-1,4-benzene, 3-bpcb = N,N′-bis(3-pyridinecarboxamide)-1,4-benzene, 1,2,4-H3btc = 1,2,4-benzenetricarboxylic acid, and H4btec = 1,2,4,5-benzenetetracarboxylic acid]. X-ray diffraction analysis reveals that 1 exhibits a 2-D layer structure and 2 possesses a three-dimensional (3-D) network. In 1 and 2, CuII ions are connected by bridging 1,2,4-btc or btec to form 2-D polymeric layers. Cu-1,2,4-btc layer does not propagate into a 3-D coordination framework in 1 due to 4-bpcb showing monodentate coordination (via ligation of only one pyridyl nitrogen). In 2, Cu-btec 2-D layers are further extended into a 3-D network with (64.82)3 topology by 3-bpcb ligand in μ 2-bridging coordination (via ligation of two pyridyl nitrogens). The different structures of the two complexes illus...

Two new Keggin-based hybrid compounds, [Cu2(pdon)3][PMoVI 11MoVO40]·3H2O (1) and [Mn2Cl(H2O)2(pdon)4][PMo12O40]·2H2O (2) (pdon = l, l0-phenanthroline-5,6-dione) (pdon), were synthesized under hydrothermal conditions. By using different metal ions and tuning the ratio of metal to ligand, pdon shows different coordination modes. In compound 1, pdon with three kinds of coordination modes link CuII ions to form a 1D wave chain and Keggin-type polyanions [PMoVI 11MoVO40]4− fringe this 1D chain; hydrogen bonding interactions extend these 1D chains into a 2D supramolecular network. Compound 2 exhibits a discrete structure, in which pdon shows a single chelating coordination. Electrochemical properties of the title compounds have been investigated.

Two new Pb(II) coordination polymers, [Pb(3-pdip)(L1)] · 0.5H2O (1) and [Pb(4-pdip)(L2)] (2) [L1 = heptane diacid, L2 = hexane diacid, 3-pdip = 2 -(3-pyridyl)imidazo[4,5-f]1,10-phenanthroline, 4-pdip = 2 -(4-pyridyl)imidazo[4,5-f]1,10-phenanthroline], have been obtained from hydrothermal reactions of Pb(II) nitrate with two flexible fatty carboxylic acids and two phenanthroline derivatives. Single-crystal X-ray diffraction analysis reveals that 1 is a 1-D staircase-like double chain coordination polymer extended by binuclear [Pb2N4O8] subunits and pairs of L1 ligands. Compound 2 exhibits a 2-D (4,4) network based on bi-metallic [Pb2N6O8] units and (L2)2/(4-pdip)2 double linkers. Furthermore, adjacent chains of 1 and layers of 2 are extended into 3-D supramolecular networks by π–π stacking interactions between aromatic rings of phenanthroline groups. The organic carboxylic acids with different lengths show great influence on the shapes of Pb(II)-carboxylate double chains. Phenanthroline derivatives possess...

Through tuning the oxidation states of CuI/II, two Keggin-based compounds with different topologies, [ (btx)4(P O40)] (1) and [ (btx)4(SiW12O40)] (2) (btx = 1,6-bis(1,2,4-triazol-1-y1)hexane), were synthesized and structurally characterized. In 1, there exist decanuclear CuI circuits, which are linked through N1-containing btx ligands to construct a grid-like 2-D layer. Three sets of these layers interpenetrate to build a three-fold interpenetrating framework. The Keggin polyanions connect the adjacent three-fold interpenetrating frameworks to construct a 3-D structure. In 2, the CuII-btx moiety shows a (66) 3-D hexagonal channel-style framework. The Keggin polyanion offering four terminal oxygen atoms incorporates with this metal–organic framework imbedding the channels. The different oxidation states of copper ions (+I/+II) induces distinct coordination modes of btx and Keggin polyanions and affects the whole structural topologies. Tuning the oxidation states of copper ions is an effective strategy for ...

By using the flexible bis(triazole) ligand 1,2-bis(1,2,4-triazol-1-yl)ethane (bte), a polyoxometalate-templated compound, [Zn2(bte)4(SiW12O40)]·2H2O (1), was synthesized under hydrothermal conditions. The compound was characterized by single-crystal X-ray diffraction, elemental analyses, IR spectroscopy, photoluminescence spectroscopy, and cyclic voltammetry. Compound 1 is constructed from two motifs: the [SiW12O40]4− polyanion and a bi-nuclear metal-organic circle [Zn2(bte)2]4+. The polyanion exerts a template role, inducing the formation of the bi-nuclear circle. The circles build a 1-D circle connecting circle chain through sharing the same Zn ions. Adjacent circles in the chain are vertical with each other. The template polyanion is surrounded by four circles from four different 1-D chains, forming a 3-D supramolecular structure.

Two new cobalt complexes based on benzene tricarboxylates 1,2,4-H3BTC (1,2,4-H3BTC = 1,2,4-benzenetricarboxylate) or 1,3,5-H3BTC (1,3,5-H3BTC = 1,3,5-benzenetricarboxylate), and the bent dipyridyl ligand 2,5-bis(3-pyridyl)-1,3,4-oxadiazole (3-bpo) or its 4-pyridyl N-donor analog (4-bpo), formulated as [Co(1,3,5-BTC)(4-bpo)(H2O)3]2[Co(H2O)6] · 10H2O (1) and [Co3(1,2,4-BTC)2(3-bpo)2(H2O)12] (2), have been hydrothermally synthesized and characterized by elemental analyses, IR spectroscopy, TG analyses, and single-crystal X-ray diffraction. Structure analysis reveals that 1 is a 3-D porous supramolecular network based on the 1-D polymer chain , in which discrete [Co(H2O)6]2+ units and lattice water molecules are dispersed. In 2, bridging 3-bpo and 1,2,4-BTC connect cobaltions to form a trinuclear cobalt unit. Adjacent trinuclear cobalt units are further linked by π–π stacking interactions and hydrogen-bonding interactions to form a 3-D supramolecular framework. Electrochemical properties of cobalt(II) compoun...

Three new polymeric frameworks, [Cd(bbbi)(ita)(H2O)] · H2O (1), [Cd(bbbi)(fma)] (2), and [Cd(bbbi)(fma)(H2O)] · 2H2O (3) (bbbi = 1,1-(1,4-butanediyl)bis-1 H-benzimidazole, H2ita = itaconic acid, and H2fma = fumaric acid), have been hydrothermally synthesized and structurally characterized by single-crystal X-ray diffraction. Complex 1 is a 2-D (4,4) network containing infinite 1-D zigzag Cd(II)-bbbi chains linked by auxiliary ita ligands. In the structure of 2, infinite 1-D linear Cd(II)-bbbi chains are linked by fma ligands to generate an undulated 2-D (4,4) network. In 3, an in situ ligand transformation occurred with malate converted to H2fma by dehydration. Thus, a 2-D (4,4) grid network constructed from bbbi and fma was obtained. The carboxylates with different substituents play an important role in the formation of the final frameworks and coordination modes of Cd(II). Thermal stability and luminescent properties of 1–3 were investigated.

A novel biodegradable graft co-polymer based on cellulose diacetate (CDA) and poly(p-dioxanone) was synthesized by ring-opening polymerization of p-dioxanone (PDO). The molecular structure of co-polymers was characterized by one- and two-dimensional NMR. The graft co-polymers with different lengths of PPDO side-chains could be controllably synthesized by changing the in-feed ratio of CDA/PDO. It was found that the PPDO content had great effect on the thermal transition behavior, crystallization ability and thermal stability of the graft co-polymer. The in vitro degradation rates of CDA-g-PPDO were higher than that of linear PPDO due to their lower crystallinity. Moreover, porous microspheres of graft co-polymers with a diameter of about 5 μm, prepared through the solvent evaporation of water-in-oil emulsion (W/O), indicated it may have potential applications in drug-delivery systems.

In this study, two new Mn(II) complexes consisting of a phenanthroline derivative and organic acid ligands, [Mn(3-PIP)(1,3-bdc)] n (1) and [Mn(3-PIP)2(1,4-bdc)] n (2) (3-PIP = 2-(3-pyridyl)-imidazo[4,5-f] 1,10-phenanthroline, 1,3-H2bdc = benzene-1,3-dicarboxylic acid, 1,4-H2bdc = benzene-1,4-dicarboxylic acid), have been synthesized via hydrothermal reaction and characterized by Fourier transform infrared (FT-IR) spectra, elemental analyses, and single-crystal X-ray diffraction. Complex 1 is a one-dimensional (1-D) twisted double chain bridged by 1,3-bdc. The 3-PIP ligands in a parallel fashion are alternately attached to both sides of the 1-D double chain. Complex 2 exhibits a 1-D zigzag chain, to which pairs of crossed 3-PIP ligands are alternately attached. The two complexes are further extended into three-dimensional (3-D) supramolecular structures by hydrogen-bonding and π–π stacking interactions. The N-donor ligands with an extended π-system play a crucial role in formation and stabilization of the ...

The dissolution behavior of chitin in a series of ionic liquids containing alkylimidazolium chloride, alkylimidazolium dimethyl phosphate, and 1-allyl-3-methyl-imidazolium acetate has been studied. Chitin with a low degree of acetylation and low molecular weight can be readily dissolved in ionic liquids, while those with a high degree of acetylation can also be dissolved in ionic liquids with various critical solution temperatures (CST) mainly depending on the structure of the chitin and the ionic liquids. The results indicated that the dissolution behavior of chitin in ionic liquids was affected by the degree of acetylation (DA), the crystallinity, and the molecular weights of chitin, as well as the nature of the anion of the ionic liquid.

The effect of an ultrahigh rubber acrylonitrile-butadiene-styrene (ABS) impact modifier resin (UHR-ABS) on the mechanical properties of an intumescent flame-retardant ABS composite was characterized. Samples were obtained by compounding ABS and an intumescent flame-retardant master batch that was prepared using an intumescent flame-retardant composite (IFRC) with ABS and/or UHR-ABS as well as by direct compounding IFRC, UHR-ABS, and ABS. The incorporation of UHR-ABS resulted in reduction in the storage modulus, damping behavior and glass transition temperature, as evidenced by dynamic mechanical analysis. With increasing mass fraction of the UHR-ABS, the tensile strength and the flexural strength decreased gradually, and the notched impact strength increased, but the increase was more significant for compounding IFRC, UHR-ABS, and ABS than for compounding ABS and IFRC master batches. SEM micrographs of the fresh fracture surface of the composites were used to estimate the mechanism of the increased notche...

Two new coordination polymers [Cd(TIP)(1,3-bdc)] n (1) and {[La(TIP)(1,3-bdc)1.5] · 0.2H2O} n (2) (TIP = 2-(2-thienyl)imidazo[4,5-f]1,10-phenanthroline and 1,3-H2bdc = isophthalic acid) were synthesized from hydrothermal reactions and characterized by elemental analyses, IR, and single-crystal X-ray diffraction. Complexes 1 and 2 are ribbon structures with different configurations bridged by 1,3-bdc ligand, further extended into 3-D supramolecular structures by π–π stacking and hydrogen bonding interactions. The most interesting feature of these two complexes is that TIP with the large π-system and additional hydrogen bonding group plays a crucial role in the formation of different weak interactions. Thermal properties and fluorescence of 1 and 2 are also investigated in the solid state.

A new 3-D copper(II) complex, formulated as [Cu2(btec)(en)2] n (1) [H4btec = benzene-1,2,4,5-tetracarboxylate, and en = ethylenediamine], was hydrothermally synthesized and structurally characterized by elemental analysis, IR spectroscopy, thermal gravimetric analysis, and single crystal X-ray diffraction. The structural analysis of 1 reveals that copper(II) connect by μ6-bridging btec to form a 3-D coordination polymer, in which four carboxylates of btec show monodentate and bidentate coordination. Complex 1 was used as solid bulkmodifier to fabricate renewable carbon paste electrode (1-CPE) by direct mixing method. The cyclic voltammogram of 1-CPE displayed one-electron quasi-reversible redox waves in potential range 300 to −300 mV due to Cu(II)/Cu(I). Moreover, 1-CPE showed electrocatalytic activity toward the reduction of nitrite.

The flame retardancy, thermal degradation, combustion behaviors and mechanical properties of a pure polypropylene (PP)/thermoplastic polyurethane (TPU) blend, and PP/TPU blends containing flame retardants, ammonium polyphosphate (APP), pentaerythritol (PER), and melamine cyanurate (MCA), as well as the surface-treated rectorite clay (REC), were investigated by the limiting oxygen index (LOI) test, vertical burning test (UL-94), thermogravimetric analysis (TGA), cone calorimetry, and mechanical testing machines. The results showed that the PP/TPU blend containing 25 wt% of the composite flame retardants, composed of APP/PER/MCA/REC (40/40/20/3 w/w/w/w), had the best flame retardancy and integrated mechanical properties: LOI value of 28.0% and UL-94 rating of V-0; the values of tensile strength, elongation at break, impact strength, and flexural strength were 21.3 MPa, 44%, 5.8 kJ m−2, and 28.8 MPa, respectively. Compared with the pure PP/TPU blend, the flame-retardant PP/TPU blend had increased fire perfor...

In order to obtain poly(ethylene terephthalate) (PET) engineering plastics with good flame retardancy, heat resistance, and mechanical properties, a novel phosphorus-containing copolyester (PET-co-DDP)/organo-montmorillonite (OMMT 1%) nanocomposite (PET-co-DDP/OMMT) was prepared by in situ intercalating polymerization. Nonisothermal crystallization kinetics and nanoscale morphology of this composite have been investigated by scanning electron microscopy (SEM), transmission electron microscopy (TEM), and differential scanning calorimetry (DSC). Based on the results of the nonisothermal crystallization kinetics, the flame-retardant copolyester PET-co-DDP has a lower crystallization rate than pure PET, while PET-co-DDP/OMMT nanocomposite has a higher crystallization rate than pure PET. Based on the Augis and Bennett method, the activation energies for nonisothermal crystallization of pure PET, PET-co-DDP, and PET-co-DDP/OMMT nanocomposite were evaluated as 101, 138, and 76 kJ mol−1, respectively. All the evi...

Montmorillonites modified by hydroxyethylhexadecyldimethyl ammonium bromine were used to prepare poly(ϵ-caprolactone) (PCL)/montmorillonite (MMT) nanocomposites by in situ ring-opening polymerization of ϵ-caprolactone. Wide-angle X-ray diffraction (WAXD) analysis illustrated that an exfoliated structure of PCL/MMT nanocomposite was obtained. The nonisothermal crystallization kinetics of poly(ϵ-caprolactone) and PCL/MMT nanocomposite was investigated by differential scanning calorimetry (DSC) at various cooling rates. The values of half-time of crystallization (t1/2) and crystallization rate constant (Zc) showed that crystallization rate increased with the increase of cooling rates for both PCL and PCL/MMT nanocomposite; however, the crystallization rate of PCL/MMT nanocomposite was faster than that of PCL at a given cooling rate.

Microwave-assisted synthesis of poly(L-lactic acid)-poly(ethylene glycol) copolymers(PLEG) by single-step polycondensation of L-lactic acid and poly(ethylene glycol) has been studied. The synthetic conditions, including catalysts, reaction time, pressure and feed weight ratios (mLA/mPEG)on the molecular weights, yields and appearance of the copolymershave been discussed. PLEG copolymers with a weight-average molecular weight of 11000 g/mol can be obtained when L-lactic acid and PEG800 mixture is irradiated for about 60 min under a reduced pressure of around 40 mmHg using SnCl2·2H2O as catalyst. The higher feed weight ratios of mLA/mPEG lead to copolymers with higher molecular weight. The products are characterized by 1H-NMR, GPC and DSC. It is found that the resultant polymers have a relatively narrow polydispersity index (PDI), which is lower than 1.3. The higher glass transition and melting temperatures of the copolymers can be obtained when the content of PEG is lower. Microwave irradiation accelerates...

Polypropylene (PP)/ethylene-octene copolymer (POE) blends with 10–50wt% POE composition were prepared using a twin-screw extruder in the melt state. Mechanical properties of PP and PP/POE blends were tested and the effect of POE content on the crystalline morphology and structure, melting and crystallization behavior, compatiblilty, phase morphology, and the interface cohesiveness of the blends were investigated by polarizing optical microscope (POM), wide-angle X-ray diffraction (WAXD), differential scanning calorimetry (DSC), dynamic mechanical thermal analysis (DMTA), and scanning electron microscopy (SEM). The relationship between mechanical properties and microstructure of the PP/POE blends is discussed. The results showed that POE had a dual function of both reinforcing and toughening PP in the range from 10–40wt%, which was attributed to the integrated functions of the degree of crystallinity of the PP phase, phase morphology, and interface cohesiveness of the blend.

In order to prepare intumescent flame retardant acrylonitrile-butadiene-styrene (ABS) composites with only a small decrease in their mechanical properties, we investigated the effect of adding an elastomeric polyacrylate latex and the surfactant TX-10 phosphate to modify the ammonium polyphosphate, melamine, and calcium 3-hydroxy-2, 2-bis(hydroxymethyl) propyl phosphate normally used, which resulted in an intumescent flame retardant composite (IFRC) powder with the aim of improving compatibility. These ABS/IFRC composites were compared with standard material containing unmodified intumescent flame retardant (NIFR) by investigating their thermal properties, melt characteristics, mechanical properties, and microstructure. The data showed that the glass transition temperature of the ABS/IFRC composites decreased slightly in all cases, the complex viscosity of the ABS/IFRC composites was remarkably reduced, and the mechanical properties improved in comparison with the material containing NIFR. A slight increa...

A new 3-D cobalt(II) mixed ligand, metal-organic framework {[Co2(bpp)2(DNBA)4H2O] · MDNBA} (1), (bpp = 1,3-di(4-pyridyl)propane, DNBA = 3,5-dinitrobenzoate and MDNBA = methyl-3,5-dinitrobenzoate) was synthesized in aqueous-methanol medium. X-ray structural analysis of 1 revealed that the dinuclear cobalt clusters interlinked by two μ-carboxylates and a μ 2 water molecule, acting as a node, are connected to four other clusters through bridging bpp to generate an extended neutral 3-D network. MDNBA was in-situ synthesized and encapsulated in the framework as a guest molecule. Moreover, the fluorescence spectrum shows 1 exhibits blue fluorescent emission in the solid state at room temperature.

A new 1-D cadmium(II) mixed ligand dimer supramolecular ladder [Cd2 L 4(3,5-DNBA)2]H2O (1), (L = 3-(2-pyridyl)pyrazole and 3,5-DNBA = 3,5-dinitrobenzoate) was synthesized by hydrothermal methods. X-ray structural analysis of complex 1 revealed that two cadmium(II) cores are bridged by two deprotonated pyrazole groups of L, leading to dinuclear cadmium(II) [Cd2 L 4(3,5-DNBA)2]. The dimers are joined by hydrogen-bonding interactions between two different cadmium(II) dimers to form a one-dimensional ladder-like framework and stabilized by weak π–π interactions. Moreover, the fluorescence spectrum of compound 1 exhibits blue fluorescent emission in the solid state at room temperature.

Starch, one of the most inexpensive and most readily available of all natural polymers, can be processed into thermoplastic materials only in the presence of plasticizers and under the action of heat and shear. Poor water resistance and low strength are limiting factors for the use of materials manufactured only from starch, and hence the modification of starch is often achieved by blending aliphatic polyesters. In this review, the literatures concerning the properties of various blends of starch and aliphatic polyesters have been summarized. The biodegradable rates of blends can be controlled to a certain extent depending on the constitutions of blends, and the mechanical properties of blends are close to those of traditional plastics such as polyethylene and polystyrene. The reduction of their sensitivity to humidity makes these materials suitable for the production of biodegradable films, injection-molded items, and foams.

This paper reviews the synthesis, properties, and applications of biodegradable polymer, poly(p-dioxanone) (PPDO), and its copolymers. Recent progress in ring-opening polymerization of p-dioxanone employing several effective catalysts is described. Properties of PPDO are given. The copolymers based on PPDO are also discussed.