Showing papers in "Polymer in 1980"
TL;DR: In this paper, the effects of polymer concentration on chain dimensions in good solvents are discussed in order to define the boundary between the semi-dilute and concentrated regimes, and it appears that chain dimensions should approach their unperturbed values for many systems at polymer volume fractions in the range of 0.05-0.20, independent of molecular weight.
587 citations
TL;DR: In this paper, a study has been made of the general crystallization behavior of poly(L-lactic acid), PLLA, and is intended to be the basis for further work on fibre formation processes.
418 citations
339 citations
281 citations
TL;DR: In this paper, a discharge-treated polyethylene terephthalate (PET) film has been discharge-treated under controlled conditions and the resulting surface modifications analysed via Xps (ESCA), contact angle and surface energy measurements changes in surface properties have been followed as a function of ageing time.
198 citations
TL;DR: In this article, the mechanism for crystal transformation in poly(vinylidene fluoride) by a tensile deformation at atmospheric pressure was investigated in the temperature range 25-150 °C.
198 citations
DSM1
TL;DR: In this article, the influence of the temperature on the drawing behavior of gel-fibres, which were obtained by spinning of a 2% w/w solution of high molecular weight polyethylene (M w = 1.1 × 10 6 ) in decalin, was studied in the range from 70 to 143°C.
149 citations
TL;DR: In this paper, the tensile deformation of poly(p -phenylene terephthalamide) fibres has been investigated using a series model consisting of a linear arrangement of crystallites and the deformation is largely brought about by the elastic strain and irreversible rotation of the crystallites.
141 citations
TL;DR: In this paper, the three principal refractive indices of poly(ethylene terephthalate) were found to be 1.645, 1.573, and 1.541.
138 citations
TL;DR: In this article, it was found by analysis of the composition and n.m.r. behavior of low-conversion soluble copolymers of styrene (S) with 5-60 wt% of ethylene dimethacrylate (EDMA) that cyclization strongly predominates in crosslinking copolymerization.
118 citations
TL;DR: In this article, the effect of high-dose radiation on the paraffinoid crystal lattice is investigated. But the main finding is not the occurrence of an orthorhombic-hexagonal phase transition on heating subsequent to irradiation at ambient temperature beyond a certain critical dose.
TL;DR: In this article, a planar-flow cross-slot device was used for the retraction of the molecules from full extension through birefringence observations and the relaxation time associated with this process was found to be considerably larger than that for the extension from the coiled state found in Part 1.
TL;DR: In this paper, the absorption of liquids by polymers which contain liquid-soluble inclusions is described, and it is shown that the equilibrium uptake of liquid can be calculated if several properties of the inclusion such as solubility as well as the modulus of the polymer are known.
TL;DR: In this article, the photocontractile effect observed on switching off the radiation is attributed to incomplete isomerization of a fraction of the azo residues in locations within the polymer matrix.
TL;DR: In this article, a study was carried out to investigate molecular orientation in injection moulded bars of short glass fibre reinforced polypropylene and polyethylene and found that the fibres do not appear to have any direct effect on the matrix orientation.
TL;DR: In this article, the mechanism of physical aging in isotactic polypropylene was studied in the α-region (15-80°C) by thermally stimulated creep and by creep superposition.
TL;DR: In this article, the reactivity of low-molecular weight polybutadiene (1,2-PB) and n-butyllithium (1-4-PB), and the effect of epoxy groups formed on the polymer solution viscosity has been investigated.
TL;DR: In this paper, a computerized infra-red study was carried out on blends of poly(vinylidene fluoride) (PVF2) with isotactic or syndiotactic poly(methyl methacrylate) (it- and st-PMMA) to investigate the effect of tacticity of PMMA on the interaction with PVF2.
TL;DR: In this article, the rubber phase volume fraction (RPVF) was used as a variable in the synthesis of impact polystyrene and it was found that notched Izod impact strength increased linearly with RPVF, while tensile yield strength was inversely proportional.
TL;DR: The phase diagram of polytetrafluoroethylene is enlarged by differential scanning calorimetry to include the concentration of hexafluoropropylene comonomer units.
TL;DR: In this article, the infra-red spectrum of one-way drawn PET film was measured as a function of further applied strain, the specimens being maintained under fixed strain, while the spectra were obtained for the two polarization situations where the electric vector is parallel and perpendicular to the draw direction.
TL;DR: In this article, the average values of molecular weight, chain length and sequence distributions in linear copolymerization are calculated directly, bypassing the calculation of distributions themselves, which is applicable to polymerizations possessing a first order Markovian statistical character.
TL;DR: In this article, a polycarbonate was thermally degraded in a rheometer barrel at temperatures from 300 to 330°C, and samples collected after 20, 40, 60 and 80 min were analysed by gel permeation chromatography.
TL;DR: In this article, the bulk viscosities of cyclic and linear poly(dimethyl siloxanes) in the weight-average molecular weight range 500 M 2 have been measured at 298 K using a cone-and-plate microviscometer.
TL;DR: In this article, the deformation behavior of blends containing polystyrene (PS), low density polyethylene (IdPE) and a PSPE block copolymer was analyzed with simultaneous volume measurements.
TL;DR: In this article, the authors provided support for the suggested mechanism describing the formation of the 2:1 (monomer:resorcinol) complex, in which resorcinols molecules formed hydrogen bonds to the polymer chain.