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Dynamic Mechanical Properties of the Transcrystalline Regions in Two Polyolefins

Dynamic Mechanical Properties of the Transcrystalline Regions in Two Polyolefins The dynamic Young's moduli E of molded films of a polyethylene and a polypropylene were found to decrease with increasing thickness t. An upper limit of E appears to exist when the film thickness is reduced to less than 1 mil. For thicker films, E is inversely proportional to t. Finally, the modulus approaches a lower asymptotic value when t is in excess of 20 mil. The results can be represented quantita tively by a model in which the surface transcrystalline region and the bulk phase of the polymer respond in a parallel com bination to the applied stress. The modulus of the trans crystalline region in each polymer is higher than that of the bulk phase. The thickness of a surface region is about 12μ in polypropylene and 15μ in polyethylene. The effects of thermal history and the nature of the molded surface were examined briefly. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Elastoplastics SAGE

Dynamic Mechanical Properties of the Transcrystalline Regions in Two Polyolefins

Kwei, T.K.; Schonhorn, H.; Frisch, H.L.
Journal of Elastoplastics , Volume 1 (1): 8 – Jan 1, 1969
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References (7)

Publisher
SAGE
Copyright
Copyright © by SAGE Publications
ISSN
0022-071X
DOI
10.1177/009524436900100105
Publisher site
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Abstract

The dynamic Young's moduli E of molded films of a polyethylene and a polypropylene were found to decrease with increasing thickness t. An upper limit of E appears to exist when the film thickness is reduced to less than 1 mil. For thicker films, E is inversely proportional to t. Finally, the modulus approaches a lower asymptotic value when t is in excess of 20 mil. The results can be represented quantita tively by a model in which the surface transcrystalline region and the bulk phase of the polymer respond in a parallel com bination to the applied stress. The modulus of the trans crystalline region in each polymer is higher than that of the bulk phase. The thickness of a surface region is about 12μ in polypropylene and 15μ in polyethylene. The effects of thermal history and the nature of the molded surface were examined briefly.

Journal

Journal of Elastoplastics – SAGE

Published: Jan 1, 1969

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