Journal ArticleDOI
The cold-drawing of high density polyethylene
J. M. Andrews,I. M. Ward +1 more
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In this article, the cold drawing of high density polyethylene has been studied over a wide range of temperatures and strain rates for a series of samples of very different molecular weight distribution, and a natural draw-ratio was observed which was almost independent of temperature and strain rate, but was sensitive to the weight average molecular weight.Abstract:
The cold-drawing of high density polyethylene has been studied over a wide range of temperatures and strain rates for a series of samples of very different molecular weight distribution. A natural draw-ratio was observed which was almost independent of temperature and strain rate, but was sensitive to the weight average molecular weight. A good correlation was observed between the Young's modulus of the drawn mono-filaments and the natural draw-ratio, and it is proposed that the Young's modulus is primarily related to molecular orientation rather than to interlamellar ties.read more
Citations
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Journal ArticleDOI
Molecular model of drawing polyethylene and polypropylene.
TL;DR: In this paper, it was shown that high molecular weight samples with many interlamella links exhibit a smaller draw ratio than lower molecular weight material, and that the three stages are intermixed in the neck.
Journal ArticleDOI
Deformation mechanisms in crystalline polymers
P. B. Bowden,Robert J. Young +1 more
TL;DR: The mechanisms which have been suggested to explain the deformation of crystalline polymers are reviewed in this article, where emphasis has been placed upon the type of information that can be gained from experimental observations and on the extent to which those observations are consistent with suggested deformation mechanisms and current ideas on polymer structure and morphology.
Journal ArticleDOI
Determination of the plastic behaviour of solid polymers at constant true strain rate
C. G'sell,John J. Jonas +1 more
TL;DR: In this paper, a tensile testing method is described in which the samples are tested atconstant local true strain rate, and it is concluded that the positive curvature of the log σ flow curve is responsible for the stabilization of flow localization associated with cold drawing.
Journal ArticleDOI
Preparation of ultra-high modulus linear polyethylenes; effect of molecular weight and molecular weight distribution on drawing behaviour and mechanical properties
G. Capaccio,I. M. Ward +1 more
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.
Journal ArticleDOI
Time resolved simultaneous small- and wide-angle X-ray scattering during polyethylene deformation—II. Cold drawing of linear polyethylene
TL;DR: In this article, the cold drawing behavior of a range of unoriented linear polyethylenes was investigated using the technique of simultaneous small-and wide-angle X-ray scattering during deformation.
References
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Journal ArticleDOI
The necking and cold-drawing of rigid plastics
TL;DR: In this paper, it was shown that the modulus of many polymers is much reduced by strain and the consequent downward bending of the stress-strain curve leads to mechanical instability and so causes a neck to form.
Journal ArticleDOI
The construction of a polyethylene calibration curve for gel permeation chromatography using polystyrene fractions
T. Williams,I. M. Ward +1 more
Journal ArticleDOI
Stress-optical properties of amorphous polyethylene terephthalate fibres
P. R. Pinnock,I. M. Ward +1 more
TL;DR: The theoretical treatment of Kuhn and Grun has been employed to calculate the polarizability of the random link and the number of effective cross-links per molecular chain this article.
Journal ArticleDOI
The influence of temperature on the plastic deformation of polyethylene
R. Corneliussen,Anton Peterlin +1 more
TL;DR: The thermal history of the starting material, quenched, slowly cooled, or annealed, affects the draw behavior as mentioned in this paper, and the long period is independent of the physical conditions of the initial sample.
Journal ArticleDOI
The cold drawing of high polymers
I. Marshall,A. B. Thompson +1 more
TL;DR: In this paper, it was shown that amorphous polyethyleneterephthalate cold draws in the shoulders of a neck when stretched at room temperature depend on the temperature and speed of stretching, and on the initial specimen cross-section and birefringence.
Related Papers (5)
Preparation of ultra-high modulus linear polyethylenes; effect of molecular weight and molecular weight distribution on drawing behaviour and mechanical properties
G. Capaccio,I. M. Ward +1 more