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Acid gas, as a kind of polluting gas, poses a great threat to human health. Therefore, there is a need for a material that can detect it, and it is of great significance to find and deal with acid gas leakage in time. In this paper, the fluorescent micromolecule NAP‐OH, a naphthalimide derivative modified by morpholine, was introduced into polyurethane as an end‐capping agent, and the prepared nanometer fluorescent sensing material E‐NAP0.5/PU by electrospinning technology exhibited a sensitive ratiometric fluorescence response behavior to acid gas. The E‐NAP0.5/PU's specific surface area was 9.142 m2/g and its diameter was 200–400 nm. In 6 ppm HCl gas, TFA and FA gases, the response time of E‐NAP0.5/PU (deep orange red) films were 2, 20, and 40 s, and the colors were green, light green and light orange‐red, respectively. This showed that the membrane has great potential application in distinguishing acid gases. In addition, the E‐NAP0.5/PU changed from orange‐red to colorless within 30 s in SO2 gas with a concentration of 360 ppm. The detection limits of E‐NAP0.5/PU for HCl, TFA, FA and SO2 gases were 996 ppb (0–10 ppm), 660 ppb (0–8 ppm), 724 ppb (0–10 ppm) and 39 ppm (0–360 ppm), respectively. More importantly, E‐NAP0.5/PU could be reused multiple times. After five times of recovery, the E‐NAP0.5/PU film still recovered to its original fluorescence intensity, and kept a good response to acid. The 1H NMR and fluorescence spectra results indicated that the possible mechanism for acid gas detection of NAP‐OH was attributed to the protonation of morpholine group. To sum up, E‐NAP0.5/PU had a broad application prospect in acid gas detection. [ABSTRACT FROM AUTHOR]

Herein, the coumarin derivative was chosen as the luminescent parent and co-polymerized with a low-toxicity, highly hydrophilic terminal hydroxy polyethylene glycol to obtain the water-soluble probe P(Cou-PEG-LD). The probe P(Cou-PEG-LD) possessed improved biocompatibility, interference resistance and photostability. Moreover, the probe exhibited optimal targeting properties toward lipid droplets and was successfully applied for dynamic monitoring of lipid droplet levels in HeLa cells. Interestingly, the sensitive labeling of the intracellular lipid droplet content using the probe P(Cou-PEG-LD) enabled the differentiation of starved and normal cells. The probe had also been successfully applied to zebrafish bioimaging and such specific features represented the great potential of the probe for disease prediction and treatment monitoring. [ABSTRACT FROM AUTHOR]

ABSTRACT A novel aromatic acetal-based acid-labile monomer 2-phenyl-5-ethyl-5-acryloxymethyl-1,3-dioxacyclohexane (HEDPA) was synthesized and polymerized by reversible addition fragmentation chain transfer (RAFT) polymerization using alkynyl functional chain transfer agent (CTA-Alk). Afterward, a series of amphiphilic diblock copolymers composed of fixed hydrophobic poly(2-phenyl-5-ethyl-5-acryloxymethyl-1,3-dioxacyclohexane) (PDAEP) segments and various lengths of hydrophilic mPEG segments were prepared through click reaction between alkynyl-terminated PDAEP and azido-terminated mPEG. The self-assembly behaviors of the diblock copolymers were investigated by dynamic light scattering (DLS), transmission electron microscopy (TEM), fluorescence spectroscopy, and 1H NMR. These results indicated that the diblock copolymers could self-assemble into nano-sized micelles with PDAEP cores and PEG coronas in aqueous solution. DLS, fluorescence spectroscopy and UV-vis spectroscopy were used to monitor the pH-triggered assembly/disassembly transition of the micelles. These results showed that the assembly/disassembly transition behaviors of the diblock copolymers micelles can be adjusted by changing the lengths of the mPEG segments. © 2015 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2016, 54, 1537-1547 [ABSTRACT FROM AUTHOR]

A New Strategy to Synthesize , -Dihydroxy Multiblock Copolymers via [CpRu(CH3CN)3]PF6/Quinaldic Acid Catalyst B Inside Back Cover b : In article number 1900135, Xiaodong Fan and co-workers report a new strategy to synthesize random and alternating multiblock copolymers (MBCs) via polycondensation of terminal hydroxyl groups in macromolecular monomers. GRAPH. [Extracted from the article]