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In situ synchrotron small angle X-ray scattering (SAXS) and wide angle X-ray diffraction (WAXD) were carried out to study the lamellar and crystalline structural evolutions of poly(ethylene terephthalate) (PET) fiber during cold (20 °C) and hot (200 °C) drawing. The stress-strain curves were divided into two zones, i.e. linearly stress developing zone (zone I) and yield zone around fracture (zone...
Nd-based ternary catalyst systems are widely used for rubber industry. The effect of alkylaluminum cocatalysts has been investigated for decades. However, there is a lack of structural evidence, especially the quantitative result to illustrate the inner reasons. In the present paper, the effect of different alkylaluminum cocatalysts to the polymerization performance of isoprene has been studied. Catalysts...
A biotin-functionalized amphiphilic star-shaped block copolymer, POSS-(PCL-b-PDMAEMA)8-biotin, with an inorganic POSS nucleus, a hydrophobic poly(ɛ-caprolactone) (PCL) middle layer, a hydrophilic poly(2-(dimethylamino)ethyl methacrylate) (PDMAEMA) outer corona was synthesized for the targeting delivery and pH-responsive release of hydrophobic pheophorbide A (PPa) photosensitizers. In aqueous solution,...
Three different monomers have been used to prepare novel Bergman cyclization-based porous organic polymers (BCPOPs). The synthesis route to BCPOPs is facile and highly-effecient. Meanwhile, BCPOPs show high physicochemical stability and excellent porosities. The Brunauer–Emmett–Teller specific surface area of BCPOPs is up to 860 m2 g−1, while the carbon dioxide uptake reaches to 11.1 wt% (1.0 bar...
Distribution of nanoparticles in nanocomposites is one of the most important roles to design unique morphologies and properties; however, up to now, it is still very difficult to control distribution of nanoparticles in polymer matrix. Here we show a simple approach to fabricate ferroferric oxide (Fe3O4) nanoparticles with controllable chain-like distribution in poly(ε-caprolactone) (PCL) by a magnetic...
Well-defined PANI rhombic plates are produced via a cetyl trimethyl ammonium bromide (CTAB) micellar soft template route in low acid environment. Lamellar micelles consisting of CTAB and ammonium persulfate (APS) molecules not only serve as both soft templates and oxidant for oxidative polymerization of aniline, but also provide intermolecular interactions to assemble two-dimensional PANI sheets to...
Microporous films with tunable honeycomb structures were fabricated based on the self-assembly of a series of clusto-supramolecular star polymers (CSPs) guided by breath figure templates. The CSPs consist of a hydrophilic polyoxometalate cluster core and several hydrophobic polystyrene arms that are electrostatically connected to the core, in which three Keggin-type polyoxometalate clusters [CoW12...
Organic semiconducting/ferroelectric blend films attracted much attention due to their cross-talk-free resistive property. Blend films were fabricated from the co-dissolved solution of both semiconducting and ferroelectric components. Spinodal decomposition induced phase separation which was the key structure for determination of resistive property in such blend films. However, till now only seldom...
Molecular modeling of crosslinked polymers often follows arbitrary pathways for network generation, with different precursor topology from experimental systems. We use coarse-grained molecular simulation to study the effects of precursor choice on the predicted network structure and properties. Three sets of precursors with different molecular architectures are designed such that they would form identical...
Deposition of polydopamine on substrates is a facile and effective method of surface modification and the deposited polydopamine can reduce silver ions to form silver nanoparticles (AgNPs) for antibacterial applications. However, polydopamine deposition is a time-consuming process that usually requires 24 h to produce a dense surface coating. Since oxidation of dopamine is critical for its polymerization,...
The effect of strengthening of interaction between single fluorescent probes and polymer matrix to the probes' dynamics is investigated using single molecule fluorescence defocus microscopy. By introducing multiple hydroxyl groups to the fluorescent probes (perylene diimide derivatives) which builds up hydrogen bonds between the probe and polymer matrix, the dynamics is discovered to be retarded....
Tough hydrogels with adjustable stiffness are expected for adapting application as various biomaterials. Oppositely charged polyelectrolytes form tough and self-healing physical polyion-complex (PIC) hydrogels via formation of inter-chain ionic bonds with a wide distribution in bond strength. The strong bonds serve as permanent crosslinking to impart elasticity and the weak bonds as reversible sacrificial...
A dianhydride monomer 2, 5-bis(3, 4-dicarboxyphenoxy)-4′-phenylethynyl biphenyl (PEPHQDA) containing a chain extendable phenylethynyl pendant group has been successfully synthesized via successive nucleophilic substitution, Sonogashira cross-coupling, hydrolysis and dehydration reactions. A flexible microporous polyimide network has been prepared based on the use of triamine (TAPOB), affording hyperbranched...
Polymer fibers' thermal conductivity along its axis direction are usually much better compared to that of the bulk. Many researches indicate that three main factors have significant impact on polymer fiber's thermal conductivity, which are crystallinity, molecular alignment and crystalline grain orientation of the polymer. Most research focus on polyethylene (PE) because of its relatively high crystallinity...
Crystallinity distribution of natural rubber around filled micrometer-size glass beads under different strains are studied with in-situ micro-focused scanning X-ray diffraction (μ-SXRD), where the glass beads are taken to serve as a model of filler. The experimental results suggest, due to the gradient stress field around the glass bead, the oscillatory distribution of crystallinities around the glass...
In this study, attempts have been put to prepare toughened polylactide (PLA) through melt blending with acrylonitrile butadiene rubber (NBR) via melt mixing process. The influences of acrylonitrile (ACN) content on the compatibility, microstructure, tensile properties and impact resistance have been investigated. A matrix-dispersed droplet morphology was noted for all blend samples, and the rubber...
As the most important material of metalized capacitors, dielectric polymers with large energy density (Ue), promising discharging efficiency (η), and elevated breakdown strength (Eb) are dreadfully requested for energy storage purpose. During the charging and discharging circles, the Joule heat could cause significant temperature rising and undesirable early failure in the capacitors. Few of the known...
A series of electron-acceptor polymers, copolymers and blends were used in all-polymer BHJ photodetectors and the effect of acceptor compositions on the key device parameters of dark current density and photocurrent was investigated. Compared with acceptor polymers and polymer blends, the devices based on acceptor copolymer showed lowered dark current and higher photocurrent, due to optimal molecular...
Poly(2,6-dimethyl-1,4-phenylene oxide) (PPO) is utilized for gas separation membranes. It has a relatively high free volume with high gas permeabilities but suffers from low selectivities. PPO polymers with Mn's from 2000 to 22,000 g/mole were synthesized and blended with a poly(arylene ether ketone) derived from bisphenol A and difluorobenzophenone (BPA-PAEK). DSC showed that the blends with all...
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