Showing papers in "Polymer in 1995"

TL;DR: An emulsion freeze-drying method for processing porous biodegradable copolymers of polylactic and polyglycolic acid (PLGA) scaffolds was developed in this article.

TL;DR: In this paper, the effects of annealing on the thermal properties, morphologies and mechanical properties of poly( l -lactide) (PLLA) films were investigated by differential scanning calorimetry, polarizing microscopy and tensile testing.

TL;DR: In this paper, the polymerization of L-lactide was catalysed with Sn(II)2-ethylhexanoate (SnOct 2 ) in the presence or absence of benzyl alcohol.

TL;DR: In this paper, the authors studied the curing reactions of benzoxazine precursors based on bisphenol A and aniline to determine the feasibility of processing them into final phenolic parts.

TL;DR: In this paper, the properties of films of these blends were evaluated using differential scanning calorimetry, dynamic mechanical thermal analysis and Instron tensile testing, and compared with similar blend films made with poly(3hydroxybutyrate-co-3-hydroxyvalerate) (PHBV, 11.6% HV content).

TL;DR: In this article, a physically based, three-dimensional constitutive model was developed for simulating this wide range of features in models of polymer products and processes, and is therefore an example of a glass-rubber constitutive approach.

TL;DR: In this article, the spherulitic structure, growth rates and melting behavior of blends of bacterially produced poly(d(−)-3-hydroxybutyrate) and poly(l-lactide) were investigated using polarized light microscopy.

TL;DR: In this article, the development of morphology from pellet-sized particles to submicrometre droplets during the polymer blending process is investigated for several polymer blends in order to determine the morphology at short mixing times, a model experiment is developed that allows the matrix to be dissolved away so that the dispersed phase may be observed directly using scanning electron microscopy.

TL;DR: In this article, the individual behavior of α- and β-spherulites in polypropylene samples which have been subjected to tensile and shear loading is reported.

TL;DR: In this paper, a model is proposed to elucidate the deformation and toughening mechanisms of rubber-modified polyamides using scanning electron microscopy (SEM), TEM, small-angle X-ray scattering and various mechanical tests.

TL;DR: In this paper, structural changes in nylon-6 fibres were analysed using X-ray diffraction (X.r.d) and optical birefringence measurements.

TL;DR: Differential scanning calorimetry was utilized for investigating the isothermal crystallization of poly(3-hexylthiophene) (P3HT) sample over a wide range of temperatures.

TL;DR: Degradation product pattern and morphology changes as means to differentiate abiotically and biotically aged degradable polyethylene have been studied in this paper, where the degradation product patterns and morphology change as a means of differentiation.

TL;DR: In this paper, single gas permeabilities, selectivities and activation energies of thin (∼ 0.5 gmm), intermediate and thick amorphous glassy polymer films of a polysulfone (Udel 1700) and a polyimide (6FDA-IPDA) were investigated.

TL;DR: In this paper, the role of the interconnected silica-rich particles within the polyimide-rich matrix in depressing the α-relaxations and reducing accordingly the thermal expansion coefficient of the film or coating by an extent substantially greater than can be expected from the usual additivity rules.

TL;DR: In this paper, the results of scanning probe microscopy studies of the surface morphology of ordered molecular films from organic low-molecular-mass and polymeric compounds are discussed, including self-assembled monolayers, Langmuir-Blodgett films and composite molecular films fabricated from different organic compounds.

TL;DR: A series of electrochemical measurements, including corrosion potential, corrosion current, Tafel's constants and polarization resistance, have been made on polyaniline-coated cold rolled steel specimens under various conditions as mentioned in this paper.

TL;DR: In this article, the first glucan mini-sheet most likely to form is the one with the lowest energy in the cellulose Iα and Iβ crystallization, respectively, and the convergence of mini-crystals to form the crystalline microfibril.

TL;DR: In this article, a model for the build-up of cure stresses is proposed, in which stresses are generated by the cure shrinkage and decay by viscoelastic relaxation.

TL;DR: In this paper, a review of the general aspects of temperature rising elution fractionation (t.r.e.f) and its application in polymers with high crystallizability is presented.

TL;DR: In this paper, a model for dilatational yielding in rubber-toughened polymers is developed, which is used to predict band angles and other characteristics of yielding in toughened plastics, including the conditions under which polymers yield without cavitating.

TL;DR: In this article, a bicontinuous two-phase structure was obtained when reactive PES with amine chain ends was used, which suggests that the spinodal decomposition (SD) induced by the cure reaction is suppressed and structure coarsening is delayed by the in situ formation of PES-epoxy block copolymer, so that the phase-separated structure can be fixed at an early stage of SD.

TL;DR: In this article, a comparison of two numerical methods for the deconvolution of instantaneous chain-length distribution of linear homo- and copolymers made using multiple-site-type catalysts is presented.

TL;DR: In this article, the Debye-Huckel theory of electrolyte solutions was incorporated into a Flory-type swelling model to account for Coulombic interactions between fixed and mobile ions.

TL;DR: In this paper, the polymer electrolytes M[N(CF3SO2)2]2PEOn for M = Mg, Ca, Sr and Ba have been investigated using infra-red spectroscopy.

TL;DR: In this paper, the cure kinetics and mechanisms of a diaminodiphenylsulfone-cured tetraglycidyl-4,4′-diaminmodal-methane epoxy and its blends with poly(ether imide) (PEI) of various compositions were studied using differential scanning calorimetry (d.s.c.).

TL;DR: In this paper, the formation and build-up of interfacial morphologies along a high-modulus carbon fiber (HMCF), produced by isothermal crystallization in quiescent and sheared melts of isotactic polypropylene (PP), were studied by thermo-optical methods.

TL;DR: In this article, the effects of compatibilization on the morphology and mechanical properties of isotactic polypropylene (PP) and nitrile rubber (NBR) blends were investigated with a special reference to the effect of blend ratio.

TL;DR: In this paper, the effects of stress and physical ageing on the creep compliance of high-density polyethylene (HDPE) were studied and a unified non-linear creep relation was obtained that incorporates the physical ageing effect and predicts the long-term creep behaviour with good agreement with experiments.

TL;DR: In this paper, the morphology of thin films (5-20 μm) containing holographic transmission gratings is examined by lowvoltage, high-resolution scanning electron microscopy and TEM.