Showing papers in "European Polymer Journal in 1991"

TL;DR: The first polyphosphazene synthesis dates from the work of Allcock published in 1964 and since then, new synthetic routes have been developed, each of them characterized by specific advantages, viz. simplification, better control over molecular weights and cross-linking processes, possibility of substitution with alkyl or aryl groups.

TL;DR: In this paper, a modified chitosan is discussed using elemental analysis and NMR spectroscopies, and the results are consistent with N-monoalkylation.

TL;DR: The method of Hindeleh and Johnson and the method of Ruland and Vonk were employed for determination of the crystallinity in polyethylene, polypropylene and polyethyleneterephtalate as discussed by the authors.

TL;DR: In this paper, the degradation of amorphous poly(ethylene terephthalate) sheet material is investigated under various environmental conditions [dry, wet soil, 100% and 45% relative humidity (RH) and u.v. irradiation] by measuring the rate of chain scission using viscometric analysis at several temperatures.

TL;DR: In this paper, four conjugated poly(Schiff base sulphide) (PSBS) polymers have been synthesized and the properties and structures of the polymers and the monomers have been studied.

TL;DR: In this article, a detailed characterization of the resulting samples was performed, to establish whether these hetero-arm star copolymers exhibit the expected structure, and they showed that the resulting poly(t. tert.BuA) branches grow from the living cores of the PS star molecules.

TL;DR: In this paper, the Brabender Plastic Order was used to measure steady shear viscosities from a capillary rheometer, thermal properties from DSC and morphologies from SEM.

TL;DR: In this article, the production of unsaturation by hydrogen abstraction from monomer (transfer reaction) during the polymerization of bulk propylene oxide catalysed by potassium alkoxide in the presence of 18-crown-6 ether was assessed by NMR spectroscopy.

TL;DR: In this paper, arylpropargyl ether terminated monomers have been synthesized, (pHCCCH2OC6H4)2CMe2 (I) and the analogous model monomer pHC(CCH 2OC 6H4CME2Ph (II) having a single arylpargyl group.

TL;DR: In this paper, the morphology and electrical conductivity of EPM-PS blends containing carbon black have been studied and a detailed image analysis of the micrographs has made quantitative treatment possible.

TL;DR: In this article, reaction ratios for anionic copolymerization of ethylene oxide and propylene oxide in bulk over the temperature range 0 −80°C were determined by two methods, the first using the variation of copolymers composition with monomer feed composition according to the Mayo-Lewis equation, and the second using the triad sequence distribution derived from 13 C-NMR spectra.

TL;DR: In this paper, a poly(methacrylic acid) core and poly(styrene) shell were synthesized from poly(stylrene-b-methylenediamine) (SAI, Mn = 5.35 × 104) by casting from dioxane with hexamethylenediamines and N,N′-dicyclohexyl carbodiimide as the crosslinking reagents.

TL;DR: In this paper, conditions for the synthesis of fibrous aluminosilicate imogolite from solutions containing hydroxyaluminium cations and orthosilicic acid have been investigated.

TL;DR: In this article, the inherent viscosities of the polymers were in the range 0.26 −1.37 dl/g, and their thermotropic liquid crystalline properties were examined by DSC, microscope observations and thermogravimetric analysis.

TL;DR: In this article, a cross-linked copolyesters containing kraft lignin were synthesized with sebacoyl chloride and terephthalyl chloride by bulk polymerization.

TL;DR: In this article, the authors attributed the difference to the ladder sheet structure proposed for poly(m-phenylenediamine) (PmPDA) in terms of overall decomposition and dopant retention temperatures.

TL;DR: In this paper, a study of red phosphorus (P) and nitrogen compounds as flame retardants/smoke suppressants for thermoplastic polymers [plasticized poly(vinyl chloride), polystyrene, high density polyethylene and poly(methyl methacrylate)], both on their own and in combination with a brominated flame retardant (decabromobiphenyl), was made.

TL;DR: In this paper, the authors discuss the influence of photoamorceur on the vitesse et le rendement quantique de polymerisation of polyurethanne-acrylate photoreticules.

TL;DR: In this article, copolymerization of butyl acrylate (BA) with glycidyl acid (GA) or methacrylate was used for toughening epoxy resins.

TL;DR: In this article, the authors used differential scanning calorimetry and i.r. spectra techniques to study the mixture of poly(methyl methacrylate) (PMMA) with poly(vinyl acetate) (PVAc) and showed that PMMA is miscible with PVAc at all compositions.

TL;DR: In this article, a Diels-Alder reaction of 4-methyl-1,3-phenylene-bis(2-furanylmethyl carbamate) with bis(maleimides) was carried out in 1,4-dioxane as solvent, as well as in bulk, followed by aromatization of tetrahydrophthalimide intermediates.

TL;DR: In this article, the synthese d'un nouveau type d'agents tensioactifs non ioniques particulierement adaptes a l'extraction des proteines membranaires.

TL;DR: In this article, the rate of anionic polymerization of bulk propylene oxide catalysed by potassium alkoxide in the presence of 18crown-6 ether was followed dilatometrically.

TL;DR: In this article, the effect of varying the amount of 3-(methacryl-amidinopropyl)trimethylammonium chloride (MAD) on the emulsion copolymerization of styrene and MAD with azo-bis(isobutyramidine hydrochloride) as initiator was made.

TL;DR: In this article, the components of the solubility parameters of some polyols have been determined based on the use of three mixtures of solvents and the point of maximum interaction between the mixture and the polyol was obtained from the maximum value of the intrinsic viscosity.

TL;DR: In this paper, it was shown that the extension of the π-conjugated system of the phenyl groups by attachment of chromophoric groups does not cause a detectable shift of the u.v. absorption band.

TL;DR: MgCl 2 adducts with methyl and ethyl alcohols were prepared and characterized using magnesium, chloride and carbon contents, i.r.t. spectroscopy, powder X-ray diffraction, N 2 BET surface area and scanning electron microscopy as discussed by the authors.

TL;DR: In this article, the influence of diols on photopolymerization of 1,2-epoxy-6-(9-carbazolyl)-4-oxahexane (ECOH) has been examined.

TL;DR: In this paper, the photopolymerisation de monomeres acryliques a structure carbamate ou oxazolidone se developpe 5 fois plus rapidement.

TL;DR: In this paper, the trans → cis photo-isomerization kinetics were measured at 337 nm using polarized light with the electric vector either parallel or perpendicular to the stretching direction of the matrix.