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Friction is one of the key factors in the manufacture of ropes, and has an important influence on the mechanical behavior of many fiber assemblies. For this reason, the understanding and the evaluation of the coefficients of friction between fibers is an essential step in the development of numerical rope models. This paper describes tests on a modified, upscaled version of the ASTM (American Society for Testing and Materials) standard yarn-on-yarn abrasion test device, which allows measurement of the friction coefficient between polyamide rope yarns. It is shown that the inter-fiber angle has a significant influence on the friction coefficient, and the direction of movement relative to the filament has to be considered in the determination of this coefficient. A normalized representation allows friction coefficients measured for a range of test conditions to be plotted on a single curve. The abrasion test device allows the friction coefficient to be measured throughout abrasion tests. It is concluded that lower friction leads to higher abrasion resistance and longer lifetime.

The present study highlights the influence of support and monomer properties on the performance of thin-film composite (TFC) membranes. For this purpose, a series of polyamide-cellulose acetate thin-film composite nanofiltration (TFC-NF) membranes were prepared by interfacial polymerization technique using cellulose acetate (CA) membrane as support and the monomer of cyclohexane-1,3,5 tricarbonylchloride (HTC) as an organic phase. The effect of the cellulose acetate concentration on the pore size of the membrane support was investigated using 15%, 16.5%, 18%, 19.5%, and 21.5% of cellulose acetate. m-phenylenediamine (MPD), piperazidine (PIP), and 1,3- cyclohexanebis (methylamine) (CHMA) were studied as monomers. Results displayed that PIP/HTC membrane is more hydrophilic and has more intense granular and convex structure with rougher surface compared to the other prepared membranes. The water flow and the porosity depended on the cellulose acetate concentration. The decrease in porosity complied well with permeability, contact angle, and SEM analysis. The membrane performances were evaluated for the retention of NaCl, CaCl, and NaSO retention. Comparing the NaSO rejection with CaCl and NaCl, the former is higher than the latter.

A new kind of bio-based polyamide 5,6 (PA56) fiber has been synthesized from adipic acid and 1,5-pentanediamine. In this report, the characterization, antistatic treatment, mechanical properties, m...

Formaldehyde-based resins are widely used in the field of wood adhesives. However, high formaldehyde emission is still a serious problem. Therefore, a low-toxic wood adhesive was successfully synth...

Thermally stable and organo-soluble polyamides synthesized by polycondensation reaction of diacid monomer, 2, 5-bis (4-carboxymethylene phenyl) 3, 4-diphenyl furan (BCMPDF) with various commerciall...

Fused deposition modeling (FDM) is an additive manufacturing (AM) technique that has emerged as a suitable application in different areas, including machine design and manufacturing. The main advan...

Thin-film composite (TFC) membranes with a polyamide (PA) active layer are the industry standard in desalination applications. The layer-by-layer (LbL) approach provides more precise control over t...

This research aimed to evaluate the improvement of the mechanical properties of composites and their reduction of weight induced by milkweed floss (MW). As MW is severely affected by surface treatm...

The new aromatic m-catenated diamine, N-(3,5-diaminophenyl)-4-(naphthalen-7-yloxy)benzamide was synthesized from 2-naphthol and 4-fluoro benzonitrile as starting materials. A series of novel aromat...

The paper deals with the investigation results of nanocomposites based on polyamide-6 (PA6) and montmorillonite (MMT) intercalated by polyvinylpyrrolidone (PVP). Nanocomposites were obtained by mix...

Graphene (G) was produced and melt-blended with polyamide 6 (PA6) to study the mechanical, electrical, and flame-hindrance characteristics of PA6-G compounds. It resulted that G is well dispersed in PA6 up to 2.0 wt owing to electrostatic contact. A clear increment in degradation temperature and a drop in extreme degradation degree is detected from the thermogravimetric experiment for PA6-G compounds. The G inclusion to PA6 amended flame-protection of PA6-G compounds by delaying smoke density and reduction of flammable gas. This work proved an appropriate formulation of polymer/G compounds applied to engineering materials; develop the types of compounds with nano-additives. © 2021 Informa UK Limited, trading as Taylor & Francis Group.

The aim of this study was to fabricate novel antimicrobial nanocomposite materials by in-situ syntheses of Cu-based nanoparticles on PET and PA fabrics. The synthesis comprised three steps: (i) modification of PET and PA fabrics with biopolymer alginate in order to improve uptake of Cu2+-ions, (ii) sorption of Cu2+-ions from the solution of precursor salt and (iii) reduction of adsorbed Cu2+-ions in an alkaline solution of sodium borohydride. The influence of concentration of alginate and copper(II) sulphate solutions on Cu2+-ions uptake and total copper content after reduction was evaluated. The presence of Cu-based nanoparticles was proved by FESEM and XRD analysis. XRD analysis revealed the presence of CuO and Cu2O on the PET and PA fibers, respectively. Larger amounts of mostly agglomerated nanoparticles were detected on PET fiber surface than on the PA fiber surface. This observation is in line with results of AAS measurements confirming that the total content of Cu on the PET fabric was nearly 30% higher compared to PA fabric. Nanocomposite containing PET fibers provided excellent antimicrobial activity against Gram-negative bacteria E. coli, Gram-positive bacteria S. aureus and yeast C. albicans. On the other hand, nanocomposite comprising PA fibers ensured maximum antibacterial and fungistatic activities.

Biobased PA56 is an innovative type of biobased polyamide that is regarded as the most potential material to replace traditional petroleum-based polyamide. However, biobased PA56 exhibits poor notc...

A solvent-free and easy method to directly functionalize pristine graphene by maleic anhydride (MA) based on Diels-Alder cycloaddition reaction was reported. Functionalized graphene/Polyamide 66 (F...

Nanocomposites of Polypropylene/Polyamide 66 (iPP/PA66) with a weight ratio of (70/30) filled with stearic acid-treated nanosized CaCO3 were melt compounded in the presence of a fixed amount of gra...

Multi jet fusion (MJF) is an emerging powder three-dimensional (3D) printing technology with an ultrafast printing speed, in which polyamide 12 (PA12) is the main material currently utilised. Altho...

Thermally stable and organo-soluble polyamides synthesized by polycondensation reaction of novel diacid monomer, 2,2'-[pyridine-2,6-diylbis(oxy-4,1-phenylene)]diacetic acid with various commerciall...

Two chain extenders having different molecular structures; an alternating copolymer of ethylene and maleic anhydride (EMA) and a novel chain extender, dimeric 2,4-toluene diisocyanate (DTDI), both ...

In this study, thin-film nanocomposite nanofiltration (TFN) membranes were fabricated using interfacial polymerisation by incorporating modified cellulose nanoparticles (mNCs). In the first place, ...

Nanosilica (silica nanoparticle) has unique nanostructure, properties, and wide-ranging applications. Polyamide belongs to the category of thermoplastic polymer which may occur both naturally and s...

Polyamides (PAs) are repeatedly exposed to environments of varying humidity throughout their service life. Due to their hygroscopic nature, moisture diffusion can alter the polymer properties, some...

To reduce the lead time and costs for developing short run production injection moulding tools the potential of additive manufactured mould inserts is investigated. These hybrid moulds are compared...

Currently used humidity sensors have a large size which seriously hinders their applications in many special fields. Therefore, a facile way for fabricating miniaturized humidity sensors is desired...

In this study, reduced graphene oxide sheets (RGO) were previously modified by silane coupling when composited with Poly (phenylene sulfide) (PPS)/polyamide 6 (PA6) blends with a mass proportion of...

Textile industry produces huge amounts of wastewater containing synthetic dyes and impurities. Contaminants include toxic dyes, which can be found in dyeing wastewater. In textile industry, various...

To improve the flame retardant and anti-dripping property of polyamide fabric, Graphene oxide (GO), Melamine and TAC（Triallyl cyanurate） were used as finishing agents to modify polyamide fabric by ...

Selective Laser Sintering (SLS) is an accepted and improving technique for additive manufacturing in many different areas, from the applications of aerospace to automotive, consumer products to den...

This review encompasses detailed knowledge about recent advancement in the synthesis of novel Nanohybrids. The materials based on matrix component as epoxy and Polyamide with the specified carbon n...

The present study focuses on fabrication and characterization of halloysite nanotube (HNT) filled polyamide 6,6 nanocomposite fibers. HNTs were incorporated into the spinning solution at various co...

Maleic anhydride grafted ethylene octene copolymer toughened acrylonitrile butadiene styrene/polyamide 6 composites, strengthened with varying amounts of E-glass fibre (EG) were successfully develo...

This work proposes a digital methodology for producing patient-specific wrist immobilisation splint and evaluates form, fit and functional aspects of the fabricated splint by finite element analysi...

An efficient and low-cost method was developed for the preparation of pedunculoside from the dried barks of Ilex rotunda using crystallization combined with polyamide column chromatography. The kin...

Structural, conductive and dielectric properties of hybrid Polypyrrole (PPy)-TiO2 nanocomposite-coated polyamide fabric (PA-PPy/TiO2) synthesized by in-situ oxidative polymerization of pyrrole on t...

Recently, carbon fiber reinforced thermoplastics (CFRTP) have been widely used for various applications instead of carbon fiber reinforced thermosetting plastics (CFRP). Some matrix resins of CFRTP...

Epoxy-sized carbon fibre (ESCF) was modified by post-oxidation in air atmosphere at polyamide 66 matrix process temperature for enhancing the interfacial property of the composite. The influence of...

Using polysulfone (PSf) as the substrate, a polyamide thin-film composite membrane was synthesised via interfacial polymerisation of hyperbranched polyethyleneimine-functionalised multiwalled carbon nanotubes (HPEI/MWCNTs) and trimesoyl chloride (TMC). The prepared HPEI/MWCNT/PSf nanocomposite membrane was evaluated for the removal of Pb(II). The morphology and physicochemical properties of the prepared membranes were characterised using scanning electron microscopy (SEM), contact angle measurements and flux measurements. The adsorption studies were evaluated using inductively coupled plasma optical emission spectroscopy (ICP-OES). The prepared composite membranes (HPEI/MWCNT/PSf) showed improved Pb(II) removal and enhanced hydrophilicity. The modified membranes were found to be more hydrophilic (contact angle = 63.23°) compared to the neat PSf membrane (contact angle = 122.22°). The water flux for the modified membranes increased linearly with applied pressure. The HPEI/MWCNT/PSf-1% membrane adsorbed more than 95% of Pb(II) ions within 10 minutes.

Thermal, mechanical, and gas barrier properties of aluminosilicate (AS) filled Polyamide 66 (PA66) composites were characterized and, by extension, an applicability of the composites to the automot...

In this paper, the effects of hyperbranched polyamide on the properties of sisal fiber reinforced polypropylene composites were studied. And the microstructure, fluidity, mechanical properties, and...

Thermoplastic polyurethane (TPU) and carbon nanotubes (CNTs) were incorporated into polyamide 6 in an attempt to enhance notched impact resistance and damping performance. The morphology, mechanica...

Polyimides form an important class of high-performance polymers. Polyamides with aromatic macromolecular architecture have revealed excellent conducting, mechanical, and thermal properties for aero...

In this study, a green and efficient method was demonstrated to produce few-layer graphene (FLG) with high quality and yield via liquid-phase exfoliation (LPE) of graphite in sodium dodecyl benzene...

A novel trademark fabric coating filler was prepared by modifying CaCO3 with double-site stearic acid, and the double-site stearic acid modified CaCO3 filler was applied in polyamide coating to ach...

In this article, a simple and novel approach was presented for fabricating thermal-induced color-changing multi-layer composite fabrics (TICCF) with silver plating, polyurethane (PU) coating, and t...

Polymers are the long chain organic materials that are held together by directional covalent bonds. These kind of organic materials are either synthesized or naturally obtained and they have wide r...

A new monomeric building block was prepared via three consecutive reactions. 4-(4-Nitrobenzyl)pyridine was catalytically reduced to 4-(4-aminobenzyl)pyridine by converting the nitro to amino group....

A glass fiber bulk yarn fabric with a graphite coating was produced, with the glass fiber bulk yarn fabric used as the base material, E44 epoxy resin as adhesive, low molecular 650 polyamid...

Internal pores in composite materials generated during fabrication processing can induce negative influences on the physical properties. Among them, the fatigue life under repetitive loadings is on...

Polyesteramide (PEA) based hot melt adhesive (HMA) was successfully designed containing a high content of renewable mass. The PEA HMA was synthesized based on dimer acid (DA), catechol, ethylenedia...

The presence of metals in industrial wastewater is a major health risk in many places in the world. On pilot, the suitability of a thin film polyamide nanofiltration composite membrane (SNTE NF270-...