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Elastic modulus and thermal conductivity of ultradrawn polyethylene

✍ Scribed by C. L. Choy; Y. W. Wong; G. W. Yang; Tetsuo Kanamoto

Publisher
John Wiley and Sons
Year
1999
Tongue
English
Weight
191 KB
Volume
37
Category
Article
ISSN
0887-6266

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✦ Synopsis

The axial and transverse Young's modulus and thermal conductivity of gel and single crystal mat polyethylene with draw ratios Ο­ 1-350 have been measured from 160 to 360 K. The axial Young's modulus increases sharply with increasing , whereas the transverse modulus shows a slight decrease. The thermal conductivity exhibits a similar behavior. At Ο­ 350, the axial Young's modulus and thermal conductivity are, respectively, 20% and three times higher than those of steel. For this ultradrawn material both the magnitude and the temperature dependence of the axial Young's modulus are close to those of polyethylene crystal. The high values of the axial Young's modulus and thermal conductivity arise from the presence of a large percentage (Ο³85%) of long needle crystals.

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The effect of different thermal treatments on the elastic modulus of high-density polyethylene has been studied in order to determine which of the parameters defining the polymer morphology has the major effect on the modulus. After examination of the effects of crystallinity, spherulite size, and l