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Methoxy-poly(ethylene glycol)-block-poly(l-lactide-random-glycolide) (mPEG-PLGA) with relatively high monomer conversion, fixed LA/GA ratio, controlled molar mass, and random PLGA sequences was synthesized under microwave irradiation at 120 °C. The microstructure, i.e., the sequence of lactyl and glycolyl units, of the PLGA block was analyzed using proton and carbon-13 nuclear magnetic resonance spectroscopy...
In order to simulate the effect of non-rubber components on strain-induced crystallization (SIC) in natural rubber (NR), sacrificial metal-ligand bonds are incorporated, for the first time, into cis-1,4 polyisoprene cured by sulfur. The incorporation of sacrificial bonds is found to bring in much smaller onset strain for SIC and higher crystallinity compared with the cis-1,4 polyisoprene with sulfide...
Both pH-sensitive hydrogels and chiral hydrogels have evoked large interest in recent years. In the study, we designed and prepared a novel type of hydrogels simultaneously showing pH-sensitivity and chirality. Such hydrogels were prepared by free radical co-polymerization using N-acryloyl-l-alanine as chiral hydrophilic monomer and octadecyl acrylate as hydrophobic monomer, with K2S2O8 as initiator...
Electrospun polyacrylonitrile (PAN) copolymer nanofibers (particularly those after the post-spinning stretching process) are expected to be an innovative type of precursors for making continuous carbon nanofibers with superior mechanical properties. In this study, three types of unidirectionally aligned PAN-based nanofibers including homo-PAN, binary-PAN (a PAN copolymer with itaconic acid units),...
The combination of fumed silica (SiO2) with carbon black (CB) for improving thermal stability, flame retardancy and mechanical properties of linear low density polyethylene (LLDPE) was investigated. The temperature at the maximum weight loss rate of LLDPE was dramatically increased by 92 °C, and the peak value of heat release rate measured by cone calorimeter was significantly reduced by 80.7%. The...
Continuous bundles of aligned electrospun polyacrylonitrile (PAN) copolymer nanofibers were prepared via collection with flowing water at varied temperatures. The morphological and structural properties, as well as the density and residual solvent amount, of electrospun nanofibers in different bundles were investigated. The results indicated that with the increase of water temperature, both diffusion...
Molybdenum-phenolic resin (Mo-PR) was grafted onto the surface of multi-walled carbon nanotubes (MWCNTs) to obtain modified MWCNTs (CNT-PR). Compared to epoxy resin, epoxy resin/CNT-PR nanocomposites showed the improvements in flame retardancy and mechanical properties. Structural characterization showed that the grafted Mo-PR improved the dispersion of MWCNTs in epoxy resin and enhanced the interfacial...
Electrospun polyacrylonitrile (PAN) copolymer nanofibers with diameters of ∼0.3 μm were prepared as highly aligned bundles. The as-electrospun nanofiber bundles were then stretched in steam at ∼100 °C into 2, 3, and 4 times of the original lengths. Subsequently, characterizations and evaluations were carried out to understand morphological, structural, and mechanical properties using SEM, 2D WAXD,...
The effect of combination between a trace of halogenated compounds (such as ferric chloride and ammonium bromide) and Ni 2 O 3 particles on the carbonization of polypropylene (PP) was investigated during combustion. The results showed a synergistic catalysis of combined halogenated compounds with Ni 2 O 3 in promoting the formation of the residual char during combustion...
Effects of organically modified montmorillonites (OMMTs) with different type and amount of modifiers on flame retardancy of polystyrene (PS) have been studied. The results from morphology analysis, gas chromatography–mass spectrometry and cone calorimeter have showed different mechanisms for the flame retardancy of PS/OMMTs composites, depending on surface property of OMMTs. One is the catalysis of...
Polystyrene (PS) was completely immiscible with a liquid crystalline polymer (LCP), a copolyester of p-hydroxybenzoic acid and poly(ethylene terephthalate). As revealed by differential scanning calorimetry and scanning electron microscopy (SEM), chemically modified PS, sulfonated PS (SPS) and four of its salts, were miscible with the LCP. Each LCP/SPS blend had only one composition-dependent glass...
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