Yang Chen, Yanzhou Lei, Huawei Zou*, Mei Liang**, and Ya Cao
The State Key Lab of Polymer Materials Engineering, Polymer Research Institute of Sichuan University,
Chengdu 610065, China
*e-mail: hwzou@163.com
**e-mail: liangmeiww@163.com
Received October 30, 2013;
Revised Manuscript Received December 26, 2013
Abstract—Five bimodal polyethylene samples with different molecular parameters were studied in order to
understand the incidence of molecular architecture on the environment stress cracking resistance (ESCR). The
results showed that the tensile strain hardening stiffness at low strain rate was shown to be a fast and reliable
indicator for evaluating ESCR of polyethylene. The reduction of chain dimension from phase separation would
lead to the decrease of the possibility for a molecular in melt to form a tie molecular but an increasing number
of short chain branch content was shown to increases strain hardening stiffness or tie chains. Physical chain
entanglements were established as another source of inter-lamellar linkages that contribute to ESCR of poly-
ethylene. Within the similar branch content and no phase separation, due to an increasing in plateau modulus
was shown to increases hardening stiffness or ESCR of resins.
DOI: 10.1134/S0965545X14050058
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