Showing papers in "European Polymer Journal in 1996"

TL;DR: In this paper, the mechanical properties of sisal fiber composites of several thermoset resin matrices, [polyester, epoxy, phenol-formaldehyde] and a thermoplastic matrix [low density polyethylene (LDPE)] were evaluated with respect to fibre length and fibre loading.

TL;DR: In this article, the authors compared the electronic spectra of pernigraniline with that of poly-p-phenylenediamine, and proposed a ladder structure composed an alternating sequence of benzenoid and quinoniimine moieties.

TL;DR: In this article, the problem of the misinterpretation of polydispersity index as a single and unique measure of the width of molecular weight distributions (MWD) is discussed and the origin and solutions of the problem are clearly described via several theoretical distribution functions.

TL;DR: In this paper, a systematic study of the influence of temperature on the swelling extent of filler-free crosslinked polydimethylsiloxane (PDMS) networks is reported; 22 different liquids have been investigated between 30 and 80 °C. Data interpretation has been performed according to Arrhenius and Flory-Huggins theories.

TL;DR: In this article, the oxidative thermal degradation of poly(ethylene oxide) and poly(propylene oxide) at 150 °C in air was studied, and the structure of the residual polymer investigated using NMR.

TL;DR: In this paper, the Flory-Huggins theory was applied to ternary mixtures with constant interaction parameters and negligible elastic contribution, and it was shown that the theory offers reasonable prediction for apolar liquids in an elastomeric matrix (system 1), while approximate isotherm patterns with significant discrepancies are obtained with apolar liquid in a thermoplastic (system 2).

TL;DR: In this article, the gas permeability and free volume of polyester copolymers were studied using the positron annihilation lifetime spectroscopy (PALS) technique to indicate the relative size and concentration of free volume cavities.

TL;DR: In this article, the effect of processing conditions on the electrical and dynamic behavior of carbon black (CB) filled ethylene/ethylacrylate copolymer (EEA) composites was investigated.

TL;DR: In this article, the photoreactivities of the polymers were investigated as thin films and in solution using gel permeation chromatography, and the thermal stability of polymers was measured by thermogravimetric analysis in air and nitrogen.

TL;DR: In this article, the effect of preparation conditions on the chemical composition and morphology of the supports and catalysts is discussed with the aid of elemental analysis and microscopy, where the ethanol content had a strong effect on the MgCl 2 · nEtOH adduct preparation, and its precipitation and dealcoholation are very important factors that must be considered for good morphology to be attained in the spherical catalysts and polymers.

TL;DR: In this article, the authors studied the polyesterification of glycerol, phthalic anhydride and rubber seed oil leading to the formation of alkyd resins at temperatures between 230 and 250 °C.

TL;DR: The electrical conductivity of compression moulded samples depends on the concentration of polypyrrole, and reached values from 4 × 10−10 to 5 × 10 −3 S cm −1, which is about seven orders of magnitude higher than the conductivity in the blends prepared by mechanical mixing of PP and PPy in the same PPy concentration range.

TL;DR: In this article, the extent of graft polymer formation was measured in terms of graft level, molecular weight of the grafted polymer chains, and frequency of grafting, and it was found that although the reaction conditions were similar, the frequencies of grafts of the monomers were not of the same order of magnitude.

TL;DR: In this paper, corn starch was melt-blended in a twin screw extruder with a maleic anhydride functional group that could interact with the hydroxyl groups in the starch.

TL;DR: In this paper, the effect of stoichiometry on the dynamic and mechanical properties of epoxy resins cured with two different poly(propylene oxide) based amines was investigated and a good correlation between the toughness of these materials and their strength and ductility has been found.

TL;DR: In this article, a matrix assisted laser desorption/ionisation time-of-flight mass spectrometry (MALDI-TOF MS) is used to mass characterise several low molecular weight, commercially available PS, PMMA and PEG samples.

TL;DR: In this article, the influence of non-ionic (HEMA) structure defects introduced in poly(acrylic acid) on the complex formation with PEO (23200) at pH 3?3.

TL;DR: Alkyl radicals were produced and proved to be present (ESR) in polyacrylonitrile fibres which had been exposed to electron beams as mentioned in this paper, and by giving the irradiated fibres thermal treatment, it was possible to achieve a radical cyclisation of the PAN fibres.

TL;DR: In this article, density and viscometric studies were conducted on solutions of blends of polystyrene (PS) and polyvinyl acetate (PVAc) at 30 °C in toluene, methyl ethyl ketone (MEK) and tetrahydrofuran (THF) at 2% total solid content.

TL;DR: In this article, acrylic acid (AAc) was grafted onto a polypropylene backbone by a mechanochemical graft copolymerization reaction initiated by benzoyl peroxide (BPO) in a twin screw extruder.

TL;DR: In this paper, the cure reactions of a diglycidyl ether of bisphenol A-based epoxide resin (DGEBA) with dodecyl succinic anhydride (DDSA) as the curing agent and tris(dimethyl amino methyl)phenol (DMP-30) with a polyamide as curing agent were studied using an isothermal approach over a range of temperatures.

TL;DR: In this paper, a water soluble derivative of benzophenone was used to initiate the grafting of acrylamide onto a copolymer styrene-(ethylene-co-butene)-styrene (SEBS).

TL;DR: In this article, cyclic voltammograms were measured of thin poly(arylene-1,3,4-oxadiazole) films on glassy carbon, Pt and ITO glasses.

TL;DR: The ultrasonic velocity and density of liquid mixtures of water and poly(ethylene glycol)-200 have been measured at 30 °C as discussed by the authors, and the variation of sound velocity and adiabatic compressibility with concentration shows a change in the slope at a mole ratio of four indicating the formation of tetrahydrate.

TL;DR: In this article, the effect of monomer and initiator concentrations on percent grafting, grafting efficiency, homopolymer formation and torque generation was studied in a brabender plastic order (BPCR) and a twin screw extruder (TSE) using peroxide initiators.

TL;DR: In this paper, the graft copolymerization of acrylic acid on to acrylonitrile-butadiene-styrene terpolymer (ABS) was studied by the use of the anthracene photosensitized formation of hydroperoxides in the butadiene portion of the polymer.

TL;DR: In this paper, a mixture of low density polyethylene (PE) and ethylene propylene diene rubber (EPDM) was vulcanized using two different sulfur accelerator curative systems.

TL;DR: In this article, the sorption and diffusion of seven aliphatic esters into tetrafluoroethylene/propylene copolymeric membranes have been studied by the weight gain assay method at 25, 40, 55 and 70 °C.

TL;DR: A detailed study on the thermal behavior of two molecular weight fractions of poly(3-octylthienylene) (M w = 13,000 and 24,000 by GPC) was performed using DSC, XRD and FTIR spectroscopies and optical microscopy as mentioned in this paper.

TL;DR: In this paper, the optimal conditions for the preparation of 5-chloro-8-quinolinyl acrylate (AQ) and methacrylic acid (MA) were found.