Showing papers in "European Polymer Journal in 1976"

TL;DR: In this paper, a complete conformational analysis of the poly-α-butene chain was performed and it was shown that chain polymorphism occurs between two different minima of the energy surface separated by a very low energy gap.

TL;DR: In this paper, an estimate of the minimum length of regular helix sequences sufficient for the appearance of helix bands and regularity bands in the spectra of isotactic polypropylene and its deuterated analogue was given.

TL;DR: In this paper, the thermal stabilities of two series of segmented polyurethane fibres have been compared with their chemical structure by comparing the changes in weight loss and DTA peaks with chemical structure.

TL;DR: In this paper, 2-hydroxyethyl methacrylate was prepared by solution polymerisation using carefully purified monomer, which was characterised by osmotic pressure and light scattering measurements.

TL;DR: In this article, the authors evaluate the importance of u.v. screening, peroxide decomposition and excited state quenching in the mechanism of action of a variety of metal complex stabilisers, screening and additive studies were carried out in high density polyethylene and in model hydrocarbons.

TL;DR: In this article, it was shown that the nickel dibutyl dithiocarbamate (NiDBC) and nickel acetophenone oxime (NiOx) stabilisers function by auto-synergistic mechanisms involving u.v. screening and conventional chain-breaking and preventive antioxidant processes which operate during thermal processing operations as well as during environmental exposure.

TL;DR: The thermal degradation of copolymers of vinyl acetate with methyl methacrylate, styrene and ethylene has been investigated using thermal volatilization analysis and thermogravimetry, together with analysis of volatile and involatile degradation products as discussed by the authors.

TL;DR: In this article, it is shown that the type of gas and the process parameters can control the events of the two groups so that events on the surface and changes of the gas composition both determine the film growth kinetics independently but may lead to similar dependences on pressure, current density, etc.

TL;DR: In this paper, copolymerization of 2-hydroxyethyl methacrylate (HEMA) with methyl-methacryl (MMA), ethyl-acetyl (EA), n -butyl-acryyl (BA), and n-butylacrylated (BA) was studied in bulk at 60° using benzoyl peroxide as initiator.

TL;DR: In this article, the processes of thermal and photo-oxidation of high impact polystyrene have been shown to be closely related and the rubber phase is shown to behave as a photo-pro-oxidant.

TL;DR: In this paper, Brabender et al. show that in the case of tetrahydrofuranne a 60°, le catalyse de le stearate de zinc forme catalyse, en presence d'acide chlorhydrique, l'oligomerisation de l'hexadiene provenant de la deshydrochloruration.

TL;DR: In this paper, a correlated series of isotactic aliphatic polymers (polypropylene (PP), poly-α-butene, poly-3-methylbutene (P3MB), poly-(S)-3methylpentene-1 (P(S)3MP) and isotactic polystyrene (PS) was considered.

TL;DR: In this paper, the authors propose a variation du rapport molaire du taxogene au telogene and l'emploi de divers catalyseurs metalliques permettent d'orienter la reaction vers un degre de polymerisation donne.

TL;DR: In this article, the rate and energy of polymerization of acrylonitrile initiated by V5-thiourea or V5+-ethylene thiourerea were investigated at 30, 35 and 40°C in nitrogen.

TL;DR: In this paper, a re-etudie l'homopolymerisation radicalaire de l'anhydride maleique en solution dans le benzene and caracterise les polymeres resultants.

TL;DR: In this article, the polarization of copolymers was measured as a function of their copolymer composition in glassy solution at 77 K and compared with that of the model compounds.

TL;DR: In this paper, le chloro-4-hexene-2 (C4H2) reaction is catalysee par le chlorure de zinc and the polymerisation de la fonction epoxyde.

TL;DR: In this article, conditions de reaction and notamment le role of l'oxyde mercurique employe comme catalyseur are precises, and esters, amides et alcools derives des acides precedents sont egalement synthetises.

TL;DR: In this paper, the authors effectue des mesures de pression osmotique sur des solutions moyennement concentrees (v2 ⩽ 0.1 g/cm3) of polystyrenes lineaires and ramifies en bon et mauvais solvant (benzene and cyclohexane) a differentes temperatures.

TL;DR: In this article, the radical polymerization of methyl α-cyanoacrylate containing propane sultone at about 2 × 10 −2 mol dm −3 can be initiated at 60° by azobisisobutyronitrile or by benzoyl peroxide; amonic polymerization is not completely suppressed under these conditions but it is of minor importance.

TL;DR: In this paper, the equilibrium rigidity of poly-ϱ-benzamide (PPBA) and other aromatic polyamides with phenyl rings included in the chain in the para position has been investigated.

TL;DR: In this paper, the fluorescence quenching of polystyrene by oxygen at room temperature was investigated and the diffusion coefficient of oxygen in poly styrene films was taken as 3.1 × 10 −7 cm 2 /sec.

TL;DR: In this paper, the authors describe a method of preparation mises au point permettent de travailler sur des quantites importantes qui ont permis de faire des essais d'epuration dans l'industrie (voir partie III).

TL;DR: In this article, the authors discuss the influence of temperature and the nature of the carbanion terminal on polystyrene reaction and show that the presence of copolymeres sequences in polystyrenes can be used for amorcer la polymerisation radicalaire du methacrylate de methyle and du chlorure de vinyle.

TL;DR: In this paper, the Fixman partition function for an infinite chain is shown to be not only divergent but nonasymptotic, and the existence of the asymptotic expansion of the chainexpansion parameter α2 in terms of powers of the usual parameter z being assumed, it is extremely likely that these coefficients oscillate and increase rapidly with m. The theory of Gordon and Tutte on these sums is summarised and appropriately extended for application to the pre-averaging technique.

TL;DR: In this paper, it was shown that the trans-trans-trans and trans-cis-trans forms can be formed by an SN2 propagation reaction between the three-membered cyclic sulphonium ion and monomer, followed by a degradation reaction occurring via a back-biting mechanism.

TL;DR: In this article, it was shown that the crystallization rate is lower for more densely crosslinked polymers under the same drying conditions, and that the region of main growth of crystallites (degrees of crystallinity between 5 and 35%) could be expressed by an Avrami equation.

TL;DR: In this article, the authors propose a method to determine the conditions that rendent the selective telomerisation selective, i.e., the catalyseurs redox mis en oeuvre sont des composes du cuivre et du fer.

TL;DR: In this paper, two glass transition temperatures are observed in DSC-thermograms from blends of suspension-polymerized vinyl chloride and ethylenevinyl acetate copolymer (Levapren 450M, 45 wt % VAc).

TL;DR: In this article, a chiral polymer complex, containing N-alkylated amino acid residue and copper(II) ion, was used partially to resolve some optically active amino acids.