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Ultradrawing Behavior of One- and Two-stage Drawn Gel Films of Ultrahigh Molecular Weight Polyethylene and Low Molecular Weight Polyethylene Blends by Jen-Taut Yeh; Sheng-Shan Chang; Meng-shung Yen is a Materials Science article available to read on EtoBox.

What is Ultradrawing Behavior of One- and Two-stage Drawn Gel Films of Ultrahigh Molecular Weight Polyethylene and Low Molecular Weight Polyethylene Blends about?

The ultradrawing behavior of gel films of plain ultrahigh molecular weight polyethylene (UHMWPE) and UHMWPE/low molecular weight polyethylene (LMWPE) blends was investigated using one-and two-stage drawing processes. The drawability of these gel films were found to depend significantly on the temperatures used in the one-and two-stage drawing processes. The critical draw ratio ( c ) of each gel film prepared near its critical concentration was found to approach a maximum value, when the gel film was drawn at an ''optimum'' temperature ranging from 95 to 105°C. At each drawing temperature, the one-stage drawn gel films exhibited an abrupt change in their birefringence and thermal properties as their draw ratios reached about 40. In contrast, the critical draw ratios of the two-stage drawn gel films can be further improved to be higher than those of the corresponding single-stage drawn gel films, in which the two-stage drawn gel films were drawn at another ''optimum'' temperature in the second drawing stage after they had been drawn at 95°C to a draw ratio of 40 in the first drawing stage. These interesting phenomena were investigated in terms of the reduced viscosities of the soluti

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Author

Jen-Taut Yeh; Sheng-Shan Chang; Meng-shung Yen

Publisher

John Wiley and Sons; Wiley (John Wiley & Sons); John Wiley & Sons Inc.; Wiley (ISSN 0021-8995)

Published

1998

Language

EN

Field

Materials Science (Physical Sciences)