Showing papers in "European Polymer Journal in 1971"

TL;DR: In this article, the concentration dependence of the osmotic pressure over a wide range of concentrations (up to 0·2 g/cm 3 ) was established; the influence of molecular weight and the molecular weight heterogeneity of the samples was studied.

TL;DR: The structure of poly-p-phenylene sulphide has been determined through the application of X-ray diffraction methods as mentioned in this paper, and the structure appears to be similar to that of polyphenylene oxide, and the planes of the phenylene groups are alternately at +45° and −45° to the (100) plane.

TL;DR: In this article, the influence of sample preparation on the DTA and TG behavior of polyacrylonitrile has been studied, and various properties of the exotherm are discussed in terms of structural abnormalities and impurity effects.

TL;DR: In this paper, low temperature isothermal heating of polyacrylonitrile in inert atmospheres is shown to produce changes similar to those occurring during the exothermic initial stage of programmed pyrolysis.

TL;DR: In this article, the fusion process, melting temperature and heat of fusion of carefully crystallized fractions of isotactic polypropylene (molecular weights from 5·4 × 104 to 2·2 × 105) have been investigated.

TL;DR: In this article, the polymerization of a group of vinyl monomers in a radio-frequency glow discharge has been studied with particular reference to the potential application as a gas-phase surface coating process.

TL;DR: The thermal behavior of polyacrylonitrile was studied by DTA and TG as mentioned in this paper, and it was shown that PAN exhibits a very sharp exotherm at about 260°, caused by the oligomerization of nitrile groups.

TL;DR: The thermal oxidation of polyacrylonitrile at temperatures between 200° and 375° has been studied in this paper, where a structure comprising a cyclized polyacrylitrile chain with epoxide oxygen bonding to the apex carbons of the polycyclic arrangement was found.

TL;DR: In this article, the kinetics of ethylene oxide polymerization in THF, with Na, K and Cs-naphthalene complexes as initiators, have been studied in detail.

TL;DR: In this paper, the optical properties of aromatic and aliphatic polyisocyanates in solution have been investigated and the most probable conformation of AlIC in nonpolar solvents is the planar cis chain.

TL;DR: In this article, the reaction of ozone with polymers with main chains containing CC bonds, aromatic rings or saturated hydrocarbon links was studied, where the reaction proceeds through unstable intermediates such as the bipolar ion −C + − −H OO − or peroxy-radicals, which can isomerize or degrade, causing decomposition of macromolecules.

TL;DR: In this paper, the site of ring cleavage in the ring-opening polymerization of low strained cycloolefins (induced by tungsten halide based Ziegler-Natta catalysts) has been investigated.

TL;DR: In this paper, it was shown that the degree of swelling of the gel in good solvents increases with increasing dilution of the system with water; when the critical dilution is exceeded, the increase in the extent of swelling in heterogeneous gels is much slower.

TL;DR: Grafting of MMA on wool and modified wool fibres (viz reduced, KCN-treated, acetylated, alkylated and dinitrophenylated wool) was studied using the ceric ion technique.

TL;DR: In this article, a new method is described for the evaluation of antioxidants for polypropylene by torsional braid analysis, which shows the dominating influence of antioxidant volatility on the lifetime of articles with a high surface area to volume ratio (e.g. fibres and films).

TL;DR: In this article, the degradation of polychloroprene in the presence of air or nitrogen has been studied. But the main stage of dehydrochlorination occurs at higher temperatures than for PVC, under programmed heating conditions; it is not so clearly separated in temperature range from the subsequent carbonization as in the case of PVC.

TL;DR: In this paper, the authors studied the structural and mechanical changes during drawing of polyethylene of low density (highly branched Lupolen and linear ACX of extremely high molecular weight) by small angle X-ray scattering, observation of true stress-strain curves, crystallinity determination from density and calorimetric investigation of the debris after fuming nitric acid treatment.

TL;DR: In this article, the widths of the hyperfine lines in the ESR spectrum of a nitroxidelabeled polystyrene in toluene solution were measured. And the correlation times for rotational diffusion at three temperatures have been measured.

TL;DR: The degradation behavior of graft copolymers in the presence of styrene or of a styrene/methyl methacrylate mixture has been studied by thermogravimetry, estimation of hydrogen chloride, thermal volatilization analysis, and flash pyrolysis/g.l.c. as discussed by the authors.

TL;DR: In this paper, the double frequency component of the birefringence, which is generated when alternating fields are applied to the solutions, has been detected and used to determine molecular parameters for a synthetic polymer.

TL;DR: In this article, the degradation of polychloroprene/poly(methyl methacrylate) blends, using thermal volatilization analysis and infrared spectroscopy, was compared with that previously found for PVC/PMMA blends.

TL;DR: Graft copolymers of poly(vinyl chloride) and methyl, butyl, and heptyl methacrylate polymers were prepared by mastication of PVC in presence of the respective monomers; they have been studied by thermogravimetry, estimation of hydrogen chloride, thermal volatilization analysis, and flash pyrolysis/g.l.c. as discussed by the authors.

TL;DR: In this paper, colour scales with uniform graduation have been constructed for the unambiguous specification of grades of the discoloration, allowing an unequivocal diagrammatic representation of the degradation process of PVC.

TL;DR: Polymer type, temperature, crystallinity and orientation effects on fracture mode, discussing macroload carrying capacity, nylon fiber tie chains and molecular behavior was discussed in this article, where the authors also discussed the macro load carrying capacity of nylon fiber-tie chains.

TL;DR: The number of polymer molecules depends rather on the concentration of sodium caprolactam than on the ratio c 3 c a. as discussed by the authors showed that at temperatures around 200°, condensation and cleavage reactions occur with polymerization, leading to a change in the number of macromolecules.

TL;DR: In this article, it was shown that during the first hour the reaction is dependent on intensity and temperature but later it is independent of these two parameters, and that the dehydrochlorination reaction occurs in two parts.

TL;DR: In this article, a predicted polyethylene molecular weight calibration is obtained from the experimental polystyrene standards calibration using equations which assume that hydrodynamic volume and the unperturbed mean-square end-to-end distance are universal calibration parameters.

TL;DR: In this article, a variation of l'inhibition d'un groupe fluorescent porte par une chaine polymerique avec the concentration of un inhibiteur bon solvant du polymere en terme de concentration locale a l'interieur de la pelote.

TL;DR: In this paper, the size of the Kuhn statistical segment (A), characterizing the rigidity of macromolecules, was determined from hydrodynamic models using the theory of a persistent model.

TL;DR: In this paper, a study of the heat and entropy of melting of polypivalolactone (PPL) as well as the kinetics of PPL crystallization was performed by differential scanning calorimetry.