Showing papers in "Polymer in 1974"

TL;DR: In this paper, the effect of molecular weight and molecular weight distribution on the cold drawing behavior of linear polyethylene has been investigated, and the extensional modulus and melting behavior of the drawn material was also examined.

TL;DR: In this article, polarized infra-red (i.r.) spectroscopy has been used to study the changes in molecular orientation and conformation which occur on drawing poly(ethylene terephthalate) sheets.

TL;DR: Fracture and mechanical property data on a wide range of epoxy resin systems are presented in this article.The extent to which toughening can be induced by heterophase rubber inclusions depends more on the curing agent used than on the resin component.

TL;DR: In this article, a phase diagram of polyethylene/1,2,4,5-tetrachlorobenzene and hexamethyl-benzene was calculated for χ = 0.37, which gave a eutectic temperature of 135°C.

TL;DR: Graft copolymers prepared by Friedel-Crafts alkylation of the aromatic rings in polystyrene (PS) with the olefinic groups in low density polyethylene (LDPE) are found to be emulsifiers in mechanical blends of PS and LDPE Moreover, this copolymer acts as an adhesive between the two homopolymers.

TL;DR: In this paper, a statistical analysis of results on twenty different thermoplastics has shown that there is an inverse correlation between impact strength and dynamic modulus, but at best, this correlation only accounts for about two-thirds of the variance in impact strength.

TL;DR: In this paper, it was shown that the relative intensities of Tip components, attributed to different regions in the polymer, may be affected appreciably by spin diffusion s. In such cases, the relative information in no way reflect the amounts of material contributing to each component and therefore may not be used as an estimate of either mobile fraction or crystallinity.

TL;DR: The rate of crystallization of oriented poly(ethylene terephthalate) has been measured at 100°, 120° and 150°C using carefully prepared amorphous fiber samples.

TL;DR: In this article, the role of chain folding in the shrinkage of drawn poly(ethylene terephthalate) (PET) fibres has been established by using an improved infra-red (i.r.) technique.

TL;DR: In this article, general theoretical arguments are advanced to help in an understanding of the behavior of a single molecular chain with intramolecular forces of van der Waals type, and evidence for this pattern of behaviour is adduced from a lattice model of a selfavoiding walk with near-neighbour attractive forces using ideas which have proved useful in critical phenomena.

TL;DR: The theory of the polarized fluorescence from fluorescent molecules incorporated in an oriented solid polymer is developed for a very general model of the optical behaviour of the molecules and it is concluded that any observed intensity can be expressed in terms of the components of a fourth rank tensor.

TL;DR: In this paper, a quantitative treatment for the absorption of polarized infra-red radiation at normal incidence by a transversely isotropic polymer film is presented, where an approximate treatment of the internal field problem is also carried out.

TL;DR: In this article, a new X-ray diffraction procedure is established for the determination of crystallinity, crystallite size, and the relative proportions of cellulose II and cellulose IV in viscose rayons.

TL;DR: In this article, the fracture process in rigid poly(vinyl chloride) has been investigated and a value of 1·05 × 10−3MN/m is obtained for the energy of formation of a new surface in undrawn material.

TL;DR: The crystal thickness of PTFE has been measured for a variety of crystallization conditions and the data are fitted by the kinetic theory of chain folding as well as are those for chain-folded polyethylene as mentioned in this paper.

TL;DR: In this paper, the polyuronides (uronic acid containing polymers) are considered for the first time as a coherent group and the influence of the chemical structure, the glycosidic linkages and the charged substituents on the molecular conformations is considered together with the marked association with water which these molecules display.

TL;DR: In this article, the polarization dependence of the intensity of the Raman scattering from uniaxially oriented samples of poly(methyl methacrylate) was measured at wavenumber shifts 486, 562, 604 and 1732 cm−1.

TL;DR: In this paper, the kinetics of thin films of isotactic polystyrene have been determined using transmission electron microscopy and morphological changes accompanying crystallization have also been investigated as a function of solvent, supercooling and strain prior to crystallization.

TL;DR: In this paper, the molar cyclization equilibrium constants for cyclics [NH(CH2)5CO]x with x = 1−6 were measured for an undiluted melt equilibrate of nylon-6 at 525K using gel permeation chromatography as the principal analytical technique.

TL;DR: In this paper, the authors studied the variation of refractive index increment d n d c with molecular weight using solutions of monodisperse polystyrenes and showed that the linear relationship holds only for low molecular weights.

TL;DR: In this paper, a natural rubber (NR) gum mix with a conventional N -cyclohexyl-2-benzothiazylsulphenamide (CBS) accelerated sulphur system (0.5:2.5 CBS/S) was vulcanized at temperatures from 140°C to 200°C.

TL;DR: A short review on the literature of aromatic polyarylates synthesis is given in this article, where the authors describe the preparation of some monomers; preparation of the polymers by different chemical processing routes; physical properties; moulding behaviour.

TL;DR: In this paper, a commercial sample of polyvinylidene fluoride (PVF 2 ) was fractionated and characterized and the following relationships were found: ( η ) = 1.93 × 10 −4 M 0.677 (in dimethylacetamide at 25°C).