Showing papers in "European Polymer Journal in 1987"

TL;DR: In this paper, six novel poly(vinylsulphobetaines) have been prepared by polymerization of the corresponding monomers by adding tertiary amines to alkenyl sulphonylchlorides.

TL;DR: In this article, a convenient route for synthesizing polystyrene-b-poly(ethylene oxide) block copolymer was established for synthesising polystyryl lithium, prepared by initiating the polymerization of styrene with sec-butyl lithium, was endcapped by reaction with ethylene oxide.

TL;DR: In this paper, the authors examined the oxidative degradation of two high density polyethylene (HDPE) samples, differing in unsaturation and metal impurity content, using thermogravimetry, differential scanning calorimetry (DSC), viscometry and infra-red spectroscopy.

TL;DR: In this article, the crosslinking polymerization of acrylamide and N,N′-methylene-bis-acrylamides in aqueous solution at 22°C has been studied by H.R. 1H-NMR spectroscopy.

TL;DR: In this article, the curing reactions of new N, N ′-diglycidylimides containing trimellitimide units were described using several polyfunctional curing agents, viz. aromatic primary diamines and phthalic anhydride.

TL;DR: The thermal properties of poly(vinyl alcohol) pseudo-gel obtained by freezing have been investigated by differential scanning calorimetry in the temperature range 200-390 K as mentioned in this paper.

TL;DR: The morphology of poly(ethylene oxide)/poly(vinyl acetate) (PEO/PVAc) blends was examined using small angle X-ray scattering (SAXS) and optical microscopy as discussed by the authors.

TL;DR: In this paper, a model of cross-link reactions of polyurethane resin, including diisocyanate and polyethertriol prepolymers, is described, where all samples are placed inside a wave guide where the waves propagate in a progressive TE01 mode.

TL;DR: In this article, a complete analysis of the various steps of the curing mechanism is made through the variations of the temperature of the samples under electromagnetic treatment and those of the associated dielectric loss.

TL;DR: In this article, the compatibility of blends of polystyrene with ethylene-propylene-diene rubber was studied using an ultrasonic method and the variation of the velocity of ultrasonic wave with composition of the blend is not linear.

TL;DR: In this paper, the synthesis of 2-acryloylthioxanthone monomer is described together with its copolymerization with acrylic monomers such as methyl methacrylate.

TL;DR: In this paper, Castor oil and toluene-2,4-diisocyanate were reacted to form liquid prepolyurethane under various experimental conditions, varying the NCO/OH ratio.

TL;DR: In this paper, a viscometric analysis of ternary systems polymer-1/polymer-2/solvent was performed using ternaries of the polymers and showed two crossover points corresponding to the two critical concentrations of polymers.

TL;DR: In this paper, an optimized experimental procedure has been developed for the 13C-NMR analysis of polyethylenes, which was performed at 62.5 MHz in 60-80 (w/w)% mixtures in trichlorobenzene.

TL;DR: The theory of additive solubility of low-molecular compounds in non-polar polymers is considered in this article, where the theory is illustrated with experimental data.

TL;DR: In this paper, polycarbonates were synthesized from phosgene and three different diphenols under phase transfer conditions, using quarternary ammonium and phosphonium salts and dichloromethane as solvent.

TL;DR: In this paper, a mixture of polystyrene of molecular weights from 4000 to 80000 g/mol with poly(α-methylstyrene) was made by freeze-drying from benzene solutions.

TL;DR: The effect of several compounding ingredients on the reversion of accelerated sulphur vulcanization of natural rubber (NR) has been examined in this article, where it was found that antidegradants increase reversion, the effect being more prominent with 2-mercaptobenzimidazole Reversion appears to be typical only for the polyisoprene structure and it can be overcome by blending with SBR at appropriate ratios

TL;DR: In this article, it was concluded that the initiating centres are peroxides POOP′, where P′ is a small perfluorinated fragment, and also trapped peroxy radicals PO 2 · which undergo deoxygenation.

TL;DR: In this paper, the Gabriel method was used to extract DMAO from dimethylchloromethylphosphine oxide (DMAO) for reducing the combustibility of rigid polyurethane foams.

TL;DR: In this article, the possibility of interchange reactions in blends of the polyarylate of bisphenol A and the polyhydroxyether of polycarbonate A was considered by examining the changes in the melt-viscosity for various mixing times.

TL;DR: Because the rate constants of reaction of these phosphites with peroxyl radicals are only in the range of 10 2 M −1 sec −1 and 100 times smaller than those of phenols, phosphites should be less active as primary antioxidants than phenols.

TL;DR: In this paper, the thermal behavior of poly(ethylene oxide) and poly(vinyl chloride) blends in the solid state has been examined by differential scanning calorimetry.

TL;DR: In this article, the authors described the formation by dispersion polymerization of coloured copolymer particles of diameter greater than 5 microns, characterized by size, visible absorption spectra, and solution properties of the copolymers.

TL;DR: In this article, the authors investigated the kinetics of aqueous polymerization of acrylonitrile initiated by peroxomonosulphate Co(II) redox system in the range 30-50°C under nitrogen at a fixed ionic strength of 0.30 mol · dm −3.

TL;DR: In this article, the diphenylzine-water system was used as a catalyst for styrene oxide polymerization in benzene solution at 25, 60 and 90°, and 13C-NMR analysis indicates that the resulting PSO always has a head-to-tail arrangement, independent of the molar ratio of H2O/Ph2Zn.

TL;DR: In this article, the authors investigate the formation successive of quatre complexes: le premier impliquant uniquement les fonctions carboxyles, le second forme par deprotonation d'une fonction amide, les troisieme and quatrieme provenant de la deprotion d'un seconde fonct amide avec maintien ou non des liaisons cuivre-carboxylate.

TL;DR: In this article, various parameters were found to be important in the cure of epoxy resin, those concerned with the kinetics of the heat evolved from the reaction (such as the order, rate constant and activation energy) and those related to the thermal properties of the resin, such as thermal diffusivity and heat capacity.

TL;DR: In this paper, size exclusion chromatography (SEC) and 13C-NMR analyses have been used to measure long chain branching indices in low density, free radical-polymerized polyethylenes.

TL;DR: In this paper, the dependence of the critical micelle temperature on concentration was determined for four polystyrene-block-polyisoprene copolymers in n-hexadecane.