Time‐Temperature Strain and Molecular Weight Effects in the Environmental Stress Cracking of 0.95 Density Polyethylene
作者:
Glenn E. Fulmer,
期刊:
Transactions of the Society of Rheology
(AIP Available online 1966)
卷期:
Volume 10,
issue 2
页码: 501-512
ISSN:0148-6055
年代: 1966
DOI:10.1122/1.549063
出版商: The Society of Rheology
数据来源: AIP
摘要:
Reduced variables of time‐temperature and molecular weight are used to describe the stress relaxation failure of 0.95 density polyethylene in a stress cracking agent, Igepal CO‐630. This method was previously shown to work for 0.96 density linear polyethylene. The 0.95 density polyethylene has an apparent activation energy of 38 kcal for stress cracking. This is appreciably higher than the 22 kcal found for 0.96 density linear polyethylene. A much higher dependence on molecular weight was also found. The 0.95 density polyethylene has a lifetime that is proportional toMv5.8while the 0.96 density polyethylene has a lifetime proportional toMv3.4.Some data are also shown which indicate a difference in the sensitivity to strain for the two materials. This can lead to appreciably longer lifetimes for the 0.95 density polyethylene at low strain.
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