Showing papers in "Polymer in 1994"

TL;DR: In this article, a particulate-leaching method was developed to prepare highly porous biodegradable polymer membranes, which involved the casting of polymer/salt composite membranes followed by the dissolution of the salt.

TL;DR: The synthesis and properties of poly(3,4-ethylenedioxythiophene) (PEDOT) are reported in this article, where the authors show that PEDOT shows a low band-gap, 0.5 eV lower than that of polythiophene.

TL;DR: In this article, the polymerization behavior of a series of multifunctional methacrylate and acrylate monomers was studied using differential scanning calorimetry to characterize the reaction rate profiles.

TL;DR: In this paper, structural features and variations of poly(trimethylsilylpropyne) (PTMSP) are discussed along with the structural features necessary to achieve the best combination of high permeability combined with high selectivity.

TL;DR: In this article, the synthesis and properties of polyaniline are discussed. But the most important result in this paper is a totally new reaction mechanism for the synthesis of polyanoiline, being the most detailed and comprehensive mechanism published to date.

TL;DR: In this article, a comparison of the physical properties between dendritic, hyperbranched and linear polyester structures showed that thermal properties, such as glass transition temperature and thermogravimetric analysis, were independent of macromolecular architecture.

TL;DR: In this article, aniline can be conveniently polymerized directly into conducting material using an emulsion polymerization technique, which is carried out in non-polar or weakly polar solvents in the presence of a functionalized protonic acid that acts simultaneously as a surfactant (emulsifier) and as a protonating agent (dopant) for the resulting electrically conducting polyaniline.

TL;DR: In this article, the effect of small bubbles on the impact properties of polycarbonate foams of microcellular polycarbonates (PC) was studied to gain an understanding of the effect that small bubbles have on impact properties.

TL;DR: The first and remarkably facile synthesis of optically active polyaniline has been achieved via the enantioselective electropolymerization of aniline on indium-tin-oxide-coated glass electrodes in aqueous solution containing (1S)-(+)- or (1R)-(−)-10-camphorsulfonic acid (HCSA) as mentioned in this paper.

TL;DR: The criteria for internal cavitation of rubber particles have been evaluated in this article and it is shown that internal rubber cavitation can be considered as an energy balance between the strain energy relieved by cavitation and the surface energy associated with the generation of a new surface.

TL;DR: In this paper, free-radical copolymerization of poly(methyl methacrylate) (PMMA)-montmorillonite adducts was performed by two distinct processes.

TL;DR: A review of the literature concerning PHA-containing blends has been summarized in this paper, where the thermal and crystallization behavior of the blends, their mechanical properties, morphology and biodegradability have been reviewed.

TL;DR: A series of phenylethynyl-terminated imide oligomers were prepared by the reaction of aromatic dianhydride(s) with a stoichiometric excess of aromatic diamine(s), at calculated number average molecular weights of 1500-9000 g mol−1 and end-capped with phenylynylphthalic anhydrides in N-methyl-2-pyrrolidinone as discussed by the authors.

TL;DR: In this article, a free-radically copolymerized version of deirdyl vinyl phosphonate has been used with styrene, methyl methacrylate, acrylonitrile and acrylamide to give copolymers containing roughly equal amounts of covalently bound phosphorus.

TL;DR: In this article, transmission electron microscopy (TEM) was used to examine the morphologies of nylon 6/ABS blends compatibilized with a styrene/maleic anhydride (SMA) copolymer containing 25% SMA 25.

TL;DR: The first microbially produced biodegradable poly(R)-3-hydroxyalkanoate (PHAs) polyester was presented in this paper, where the unsaturated pendent groups were incorporated in the polymer by tailoring the carbon source for biosynthesis.

TL;DR: In this article, a change in the lamellar morphology of poly(R)-3-hydroxybutyrate (PHB) homopolymer has been attributed to the constraint imposed on the amorphous chains by the crystals.

TL;DR: In this paper, the authors consider the four criteria recently proposed by one of us (JMG) for defining a thermoreversible gel and use them with syndiotactic polystyrene/solvent systems.

TL;DR: In this paper, the essential work method was used to obtain the fracture toughness of polymeric films by using two specimen geometries to test each of two nylons and the criterion was then used to find the fracture hardness of three polyethylenes, a cast, amorphous poly(ethylene terephthalate) and two kaptons.

TL;DR: Several trifunctional, hydroxy-telechelic polyester and poly(ester-carbonate) homopolymers and copolymers were synthesized by the triol-initiated, ring-opening bulk polymerization of d,l -lactide, glycolide, e-caprolactone, and/or trimethylene carbonate as mentioned in this paper.

TL;DR: A thermally induced associative polymer was developed by grafting lower critical solution temperature side chains onto a water-soluble backbone as discussed by the authors, based upon the thermodynamic properties of the pendent chains acting as reversible crosslinkers with varying temperature.

TL;DR: In this paper, the ultrasonic degradation of water-soluble polymers pullulan, poly(ethylene oxide) and polyvinylpyrrolidone was studied at a frequency of 500 kHz.

TL;DR: In this article, a new crystal modification induced by strain was found in uniaxially oriented fibres of poly(tetramethylene succinate), which had a planar zigzag conformation of T10 (all trans) and a fibre identity period of 11.90 A.

TL;DR: The hexagonal form I' of poly(1-butene is epitaxially crystallized on 4-bromo and 4-chlorobenzoic acids as mentioned in this paper.

TL;DR: In this paper, compression-moulded sheets of bacterially produced poly(β-hydroxybutyrate) (PHB) blended with synthetic poly(e-caprolactone) (PCL) were investigated over the complete composition range from pure PHB to pure PCL.

TL;DR: In this article, the isothermal crystallization process from the melt in nylon-6,6 was followed in situ by X-ray diffraction, which confirmed the first-order transition character of the transformation temperature.

TL;DR: In this article, four different liquid crystalline diepoxides were synthesized and different scanning calorimetry and Fourier transform infra-red (FTI) was used to monitor the polymerization.

TL;DR: The morphology of binary blends of a maleated triblock copolymer (with an ethylene/butene midblock and styrene endblocks, SEBS-g-MA) with a series of nylon materials was investigated and the results compared with previous work for nylon 6 and nylon 6,6 as discussed by the authors.

TL;DR: In this article, it was shown that overoxidation starts on the polymer adjacent to the electrode and then advances to the polymer facing solution, where the original positive charges on polypyrrole (-NH + -) are mostly replaced by -NH-, accompanied by the loss of counterions.

TL;DR: In this paper, the hygrothermal degradation of a glass fiber/epoxy unidirectional composite is investigated by moisture sorption/desorption experiments and dynamic mechanical thermal analysis.