Materials Literature
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Abstract Methoxy poly(ethylene glycol)‐ b ‐poly(ε‐caprolactone) (MPEG‐PCL) or MPEG‐ b ‐poly( L ‐lactide) (MPEG‐PLLA) diblock copolymers were prepared by the polymerization of CL or LA, using MPEG as an initiator in the presence of stannous octoate. MPEG‐ b ‐poly(ε‐caprolactone‐ ran ‐ L ‐lactide) (MPEG‐PCLA) diblock co…
Abstract The copolymerization of carbazole (CZ) and 3‐methylthiophene (3MeT) was successfully performed electrochemically in freshly distilled boron trifluoride diethyl etherate by direct anodic oxidation of the monomer mixtures, although the oxidation potentials of CZ and 3MeT were quite different. The electrochemica…
Abstract Multilayered polyelectrolyte assemblies fabricated using hydrolytically degradable polyamines ( 1 – 3 ) erode gradually when incubated in physiologically relevant media. This investigation sought to characterize physically and chemically the erosion of films fabricated from these polymers and sodium poly(styr…
Ausgezeichnete Ausbeuten und Enantioselektivitäten ermöglicht ein Molybdän-Bishydroxamsäure-Katalysator bei der asymmetrischen Oxidation von Olefinen mit einem achiralen Oxidationsmittel an Luft und bei Raumtemperatur (siehe Schema; acac=Acetylacetonat). Eine Vielzahl an endständigen, cis- und trisubstituierten Olefin…
Abstract UV‐curable, organic–inorganic hybrid materials were synthesized via sol–gel reactions for tetraethylorthosilicate, and methacryloxypropyl trimethoxysilane in the presence of the acrylated phenylphosphine oxide resin (APPO) and a bisphenol‐A‐based epoxy acrylate resin. The sol–gel precursor content in the hybr…
Abstract Directly starting from lactic acid (LA) and poly(ethylene glycol) (PEG), biodegradable material polylactic acid‐polyethylene glycol (PLEG) was synthesized via melt copolycondensation. The optimal synthetic conditions, including prepolymerization method, catalyst kinds and quantity, copolymerization temperatur…
Abstract Effects of filler on microstructure and toughening behavior of cyanate ester (CE)/bentonite (BT) nanocomposites with different content of BT have been studied by positron annihilation lifetime spectroscopy, X‐ray diffraction, transmission electron microscopy, dynamic mechanical analysis, etc. The interesting…
A hole lot of protein: A method to immobilize proteins at defined positions at the single-molecule level has been developed by using templates structured by block-copolymer lithography to generate ultrahigh-density protein nanoarrays (see image). Carbohydrate–lectin (RCA or WGA) interactions on the nanoarray surface h…
Abstract The effect of the processing molding temperature on the properties and crystalline structure of acrylonitile‐butadiene rubber (NBR)/nylon 6,66,1010 (trinylon) thermoplastic vulcanizates (TPV) was studied. With decreasing molding temperature, the stress at 100% and elongation at break of TPV changed slightly,…
Abstract Dynamic modulus of elasticity (MoE) and shear modulus of wood‐filled polypropylene composite at various filler contents ranging from 10% to 50% was determined from the vibration frequencies of disc‐shaped specimens. Wood filler was used in both fiber form (pulp) and powder form (wood flour). A novel compatibi…
Abstract This article reports the chemical modification of an atactic polypropylene performed in solution. To model the process, a Box‐Wilson experimental design was used, taking in to consideration the concentrations of maleic anhydride and dycumile peroxide, as well as reaction time, as independent variables. The dy…
Abstract The time‐dependent rheological behavior of a series of 3‐hydroxybuytrate‐based semicrystalline copolymers is employed to determine the expected rheological curves that would be generated in the absence of any polymer degradation. Both dynamic frequency sweep and shear rate sweep experiments were analyzed. A m…
Abstract Fractionated components of Bombyx mori silk fibroin, which were hydrolyzed with protease, were prepared with a preparative‐recycling high‐performance‐liquid‐chromatography system to evaluate the protective effects of molecular‐weight‐controlled B. mori silk fibroin components on H 2 O 2 ‐injured neuronal cell…
Abstract Bound rubber (BdR) is considered as a measure of the filler–polymer interaction in rubber compounds. The variation of the BdR content with storage time was studied in chlorobutyl compounds filled with fillers like carbon black, carbon–silica dual phase filler (CSDPf), silica, and nanoclays. The effect of the…
Abstract MPEG–PCL diblock copolymers consisting of methoxy polyethylene glycol (MPEG) and poly(ϵ‐caprolactone) (PCL) as drug carriers were synthesized by ring‐opening polymerization. It is possible to control the balance between hydrophilic and hydrophobic by changing the MPEG and the ratio of ϵ‐CL to MPEG. Implantabl…
Abstract Core–shell poly(acrylic acid)/polystyrene/SiO 2 (PAA/PS/SiO 2 ) hybrid microspheres were prepared by dispersion polymerization with three stages in ethanol and ethyl acetate mixture medium. Using vinyltriethoxysilane (VTEOS) as silane agent, functional silica particles structured vinyl groups on surfaces were…
The excitation energies of small ZnS nanoclusters characterized in previous studies have been calculated using TDDFT. The relativistic pseudopotentials of Stevens et al have been used, including Zn 4s(2) electrons and S 3s(2) and 3p(4) electrons as valence electrons. Results obtained with these pseudopotentials are co…
Abstract The temperature profiles of wood sawdust/polypropylene (PP) composite melts during cooling were experimentally investigated with a cooling jacket apparatus connected to the end of an injection‐molding machine. Real‐time melting temperature was measured with an unsheathed thermocouple array coupled with a high…
Abstract Poly(2‐chloroaniline)/silica (P2ClAn)/SiO 2 nanocomposites have been chemically prepared by oxidative polymerization of 2‐chloroaniline in acidic medium containing SiO 2 . The prepared composites were characterized by FTIR, UV–vis, TGA, XRD, SEM, ESEM, conductivity, and magnetic susceptibility. The incorporat…
Abstract Distributions of carbon black in 30/70% (w/w) natural rubber (NR)/acrylic rubber (ACM) blends were investigated as a function of the carbon black content and type using a dynamic mechanical thermal analysis (DMTA) technique. Two different types of carbon black (N220 and N330) were used, and 10–50 phr carbon b…