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A Model for Predicting the Ultimate Strength of Styrene-Diene Thermoplastic Elastomers Based on the Failure Processes at the Molecular Level

Published online by Cambridge University Press:  01 February 2011

Qiumei Zeng  and
Jeremy W. Leggoe
Qiumei Zeng
Affiliation:
Chemical Engineering Department, Texas Tech University, Lubbock, TX, 79409
Jeremy W. Leggoe
Affiliation:
Chemical Engineering Department, Texas Tech University, Lubbock, TX, 79409
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Abstract

The objective of this investigation is to formulate a model to predict the theoretical strength for styrene-diene thermoplastic elastomers (TPEs) that takes into account the failure processes occurring at the molecular level. Styrenic TPEs may fail via either chain pull-out, in which the polystyrene (PS) end-blocks are pulled out of the glassy PS domains, or chain scission, in which the C-C bonds in the elastomer mid-blocks are ruptured. By relating the microscopic deformation of an individual chain to the macroscopic strain rate, the maximum force a chain can sustain is obtained. The theoretical strength of the material is then computed by determining the force sustained by the PS domains and matrix chain sections intersecting a planar unit area at the onset of failure. The model has been used to investigate the effect of PS molecular weight, PS content, and strain rate on the ultimate strength.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 882: Symposium EE – Linking Length Scales in the Mechanical Behavior of Materials , 2005 , EE7.7
Copyright
Copyright © Materials Research Society 2005

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