Showing papers in "Polymer in 1975"

TL;DR: In this paper, it was shown that the amount of char and the incombustible gases that may be formed in thermal decomposition are very important quantitative measures of flame resistance.

TL;DR: In this paper, it is shown how differential scanning calorimetry (d.s.c.) data can be transformed to enthalpy curves which give Tg with an accuracy of ± 1K.

TL;DR: In this paper, the authors measured the Raman spectrum of poly(ethylene oxide) (PEO) M w = 3 × 10 6 and 6 × 103 in bulk and in aqueous and chloroform solution as a function of solvent concentration.

TL;DR: In this paper, a dilute solid dispersion of poly(α-methylstyrene) (PMS) within D-PMMA has been investigated at M w = 250 000.

TL;DR: In this article, a calorimetric study was carried out on blends of poly(vinylidene fluoride) (PVF 2 ), and isotactic, atactic and syndiotactic poly(methyl methacrylate) (i-, a-, and s-PMMA).

TL;DR: In this article, the compatibility behavior of poly(vinyl methyl ether) (PVME) and monodisperse polystyrene (PS) is studied for solution cast films.

TL;DR: The principle of anionic block copolymerization of styrene and divinylbenzene, first employed by Rempp and his coworkers, was further developed in this paper, where star molecules with a large number of short side chains, according to Rempp's method, were prepared in a first step, and these stars with living nuclei were used to prepare stars.

TL;DR: In this article, the effect of molecular weight on the cold drawing behavior of melt-crystallized linear polyethylene has been studied and it is shown that the draw ratio achieved under comparable conditions rises with decreasing M w, very high draw ratios (∼36) being possible for optimum morphology of the undrawn polymer.

TL;DR: In this paper, the decomposition of polystyrene samples with molecular weights ranging from 900 to 1.8 × 10 6 have been carried out making use of the differential thermogravimetric and differential scanning calorimetric techniques.

TL;DR: In this article, a theoretical model is proposed which allows the solid bed of material in the screw channel to accelerate naturally, and also allows for the presence of a film of molten material between the bed and the screw.

TL;DR: In this article, uniaxial and rotating bending fatigue tests were carried out on polypropylene, polycarbonate, poly(methyl methacrylate) (PMMA), poly(tetramethylene terephthalate) (PTMT) and glass filled PTMT to establish the general regimes of thermal softening and fatigue types of failure observed in earlier tests on acetal copolymer.

TL;DR: In this paper, the main glass transition temperatures, Tg of narrow distribution anionic polystyrene samples have been measured by differential thermal analysis (d.t.a.) and the data were verified by differential scanning calorimetry.

TL;DR: In this article, the rate constant of transesterification of DMT with ethylene glycol (EG) in the presence of various metal compounds as catalysts at 197°C, calculated from the quantity of formed methanol, was used to evaluate each metal compound in its catalytic activity.

TL;DR: In this article, the dielectric relaxation behavior of mixtures of polystyrene with the glass-forming liquids di-n-butyl phthalate, tri-tolyl phosphate and di-octyl polyphthalate has been studied over a wide range of compositions.

TL;DR: In this paper, the intensity of radiation scattering by poly(methyl methacrylate) (PMMA) chains is computed as a function of scattering angle over the range 0 4π λ) sin ( υ 2 ) A −1, on the basis of a realistic rotational isomeric state model.

TL;DR: In this paper, a method is described by which the true energy release rate at fracture may be determined from a conventional impact test, and the results are described in terms of a yield stress dependent thickness effect.

TL;DR: The domain structure and crystalline morphology of AB and ABA type block copolymers of ethylene oxide (EO) and isoprene (Ip) were investigated by using two kinds of casting solvents, non-selective (benzene) and selective (ethyl benzene) as discussed by the authors.

TL;DR: In this article, a stacked lamella model with alternating amorphous and crystalline layers was used to determine the spacings, specific volumes and melting points for a series of well characterized poly(ethylene oxide)/poly(propylene oxide) type PEP block copolymers.

TL;DR: In this paper, a mixture of isotactic and syndiotactic poly(methyl methacrylate) (i- and s-PMMA) is obtained by precipitation from chloroform and acetone solutions.

TL;DR: In this paper, the dependence of the nmr spectra on the orientation of the static magnetic field with respect to the draw direction has been studied with regards to both line shape and second moment variation.

TL;DR: In this article, a new process of specific fibrillation from melts of polymer mixtures is considered, where a complex thread consisting of hundreds of thousands of ultrafine fibrils oriented along the extrusion axis is obtained as a result of compressing the melt mixture through a single orifice (or upon extension of one stream of the polymer melt mixture).

TL;DR: In this article, spectra of polybutadienes with different contents of cis-1,4- and 1,2-units are assigned in the resonance region of the cis and trans carbon double bond.

TL;DR: In this paper, the authors measured the pressure dependence of the upper critical solution temperature in polystyrene-cyclohexane system over the pressure range of 1 to 50 atm.

TL;DR: In this article, the authors studied the crystallization of isotactic polystyrene induced by dichloromethane and acetone and deduced the critical concentration for crystallization from equilibrium absorption data.

TL;DR: In this paper, the authors used labeled plasticizers and radioactivity measurements in conjunction with weight loss, can give quantitative information on the amount of migrated plasticizer, and on amount of the liquid medium that diffuses into the polymer during the migration process.

TL;DR: By measurements of polymerization rate, grafting efficiency and number-average molecular weight of free and grafted polystyrene, the α-dicumyl peroxide initiated polymerization of styrene on cis-1,4 polybutadiene at 100°C and at low extents of reaction was studied.

TL;DR: In this article, the reactivity ratios for the free radical copolymerization of styrene and methyl methacrylate at 50°C have been evaluated in dioxane, acetone and dimethylformamide solutions.