Viscoelastic relaxation times of a homogeneous block copolymer

The molecular theory of viscoelasticity has been modified in a previous publication for homogeneous block copolymers; the theory predicts that the maximum relaxation time of the block copolymer can be computed with the knowledge of submolecular sizes and monomeric friction coefficients. Stress‐relax...

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Bibliographic Details
Published in:Journal of polymer science. Polymer symposia 1974, Vol.46 (1), p.55-67
Main Authors: Shen, Mitchel, Hansen, David R.
Format: Article
Language:English
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Summary:The molecular theory of viscoelasticity has been modified in a previous publication for homogeneous block copolymers; the theory predicts that the maximum relaxation time of the block copolymer can be computed with the knowledge of submolecular sizes and monomeric friction coefficients. Stress‐relaxation experiments were carried out for two samples of styrene‐(α‐methyl styrene)‐styrene triblock copolymers. Maximum relaxation times were determined from the viscoelastic master curve through the use of procedure X developed by Tobolksy and Murakami. Experimental results were found to be in reasonable agreement with theoretical predictions. The theory also predicts the existence of a singularity in the distribution of relaxation times at very short relaxation times, but as is discussed, this prediction cannot be verified by existing experimental techniques.
ISSN:0360-8905
1936-0959
DOI:10.1002/polc.5070460106