Showing papers in "European Polymer Journal in 1977"

TL;DR: In this paper, the influence of the molecular weight on the relative quantum yield of the pyrene groups has been analyzed according to the general kinetic treatment of diffusion controlled quenching processes.

TL;DR: In this article, the effects of thermal processing on the chemical and physical properties of low density polyethylene are strongly dependent on the amount of oxygen present in the mixer, and it is concluded that hydroperoxides are the most important initiators during the early stages of photo-oxidation of normally processed polymers.

TL;DR: In this article, it was suggested that the peroxide decomposing and chain breaking antioxidants which are effective synergists during thermal oxidation of LDPE are antagonistic during photo-oxidation; it is suggested that this may be due to sensitisation of the photolytic destruction of the dithiocarbamates by oxidation products of the phenol.

TL;DR: In this article, the authors investigated the influence of solvents on the auto-associated oligomers and on polymerization kinetics of acrylic acid and found that the auto acceleration is caused by a "matrix effect" of the poly(acrylic acid) formed in the early stages of the reaction.

TL;DR: The kinetics of the free-radical copolymerisation of styrene and maleic anhydride at 60° in bulk and in several solvents have been studied in this paper.

TL;DR: In this paper, arylene-vinylene polymers with moderate d.c. conductivity ( ca. 1 μmho m −1 at room temperature) were used to measure the electric field relaxation.

TL;DR: In this paper, the properties of dilute solutions of polyvinylpyrrolidone in various solvents are studied by measurements of viscosity and osmotic pressure.

TL;DR: In this paper, six highly crosslinked polystyrene-supported phosphines have been prepared by suspension copolymerization, and used to convert alcohols in high yield to chloroalkanes, in carbon tetrachloride as co-reagent and solvent.

TL;DR: In this paper, the mechanism of photo-oxidation of both low density and high density polyethylenes has been studied kinetically, and the results are consistent with the view that when substantial quantities of carbonyl compounds are present in the polymers by photolysis of thermally formed hydroperoxides, they are intimately involved as initiators in the photooxidation by Norrish I photolyisation of ketones.

TL;DR: In this article, the photochemistry and emission properties of a series of samples prepared under differing oxygen partial pressures suggest that these carbonyl groups originate from in-chain peroxides.

TL;DR: In this article, the synthese et l'etude des proprietes physicochimiques en solution diluee de polystyrenes ramifies en etoile a 4 branches and en peigne are presented.

TL;DR: In this paper, the photo-oxidative degradation of ABS, MBS and MABS were compared using i.r. and u.v. spectroscopy, gel permeation chromatography, colour measurement and falling weight impact tests.

TL;DR: The rubber damping peak of pure polybutadiene (PB) cannot be measured by a visco-elastomeric technique (Rheovibron).

TL;DR: In this article, a priori, the oligomeres polyamides-11 ω,ω' dicarboxyliques par le butanol ou l'alcool benzylique have been prepared with des masses of molaires choisies.

TL;DR: In this paper, the authors investigated intramolecular excimer formation for three polystyrene model molecules (2,4-diphenylpentane, 2,4,6-triphenylheptane and 2, 4,6,8-tetraphenylnonane).

TL;DR: In this article, it was shown that processes leading to the introduction of peroxide groups into polybutadiene also lead to photo-sensitization of modified polystyrene (HIPS).

TL;DR: In this article, a new quantitative method is proposed for determination of labile chlorine in PVC, based on reaction of the labile atoms with phenol and analysis of the product by u.v. spectroscopy.

TL;DR: In this paper, the relative viscosity of a rod-like macromolecule is derived for a model where the axial ratio is independent of the molecular weight of the model.

TL;DR: In this article, the effects of alkyl(aryl)tin salts of maleic and thioglycolic acids and their esters upon the rate of dehydrochlorination and crosslinking, and on the absorption spectrum of PVC during degradation in vacuum at 190°.

TL;DR: For the system hydroxypropyl cellulose/water, results from free diffusion and osmotic pressure measurements are reported over a very large concentration interval and at temperatures remote from as well as close to 0-conditions as mentioned in this paper.

TL;DR: In this paper, a theoretical study on the flexibility of polyamidoacids and polyimides containing planar cycles connected by different types of joints was carried out, where the authors considered polyaminoacids as a sequence of linear links joined at some angles with free rotation about the links.

TL;DR: In this article, it is proposed that the two components are formed at two distinct and independent active centres, and the presence of these groups at the active centre accounts for the influence of the Bu group on the stereospecificity of the polymerization.

TL;DR: In this paper, an analysis of the kinetics of generation of Quinolide Peroxides (QP) in polymer and other organic compounds during oxidation inhibited by hindered phenols is presented.

TL;DR: In this paper, sedimentation coefficients for three polystyrene fractions (molecular weights 1.1 × 10 5, 3.9 × 10 6 and 1.8× 10 6 ) in toluene and transdecalin (θ-conditions) up to high concentrations were reported.

TL;DR: In this article, block co-polymers of polystyrene with 1-t-butyl aziridine and with 1-(2 phenylethyl)-2-methyl Aziridine have been prepared using as initiator dormant polystyryl perchlorate.

TL;DR: In this paper, l'influence de la nature du catalyseur [Ti(OBu)4 est retenu], de sa concentration, de la masse molaire des oligomeres, de the duree de la reaction, de de la temperature, of la pression, of the vitesse d'agitation.

TL;DR: In this paper, the copolymer glycidyl methacrylate-ethylene dimethachrylate with ethyl amine and 2-hydroxyethyl amine was employed to prepare new types of macroporous complexing resins.

TL;DR: In this article, α-methylstyrene has been irradiated at room temperature in dichloroethane or tetrahydrofuran solution and in bulk with 15 MeV electrons (pulse duration: 30 psec-1 μsec) and transient absorptions with maxima at 465 and 680 nm were found.

TL;DR: In this paper, a kinetic scheme has been proposed involving production of initiating radicals from oxidation of thiourea by ceric ions and termination exclusively by the interaction of the chain radicals with ceric ion.

TL;DR: In this paper, the copolymerization kinetics of N -ethylmethacrylamide with methylene bis-acrylide are affected by the gel effect, as for most vinyl-divinyl systems.