Accession Number : AD0774769
Title : Viscoelastic Relaxation Times of a Homogeneous Block Copolymer.
Descriptive Note : Technical rept.,
Corporate Author : CALIFORNIA UNIV BERKELEY DEPT OF CHEMICAL ENGINEERING
Personal Author(s) : Shen,Mitchel ; Hansen,David R.
Report Date : 15 AUG 1973
Pagination or Media Count : 30
Abstract : The molecular theory of viscoelasticity 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-(alpha-methyl styrene)-styrene triblock copolymers. Maximum relaxation times were determined from the viscoelastic master curve through the use of Procedure X developed by Tobolsky and Murakami. Experimental results were found to be in satisfactory agreement with theoretical predictions. (Modified author abstract)
Descriptors : *Polymers, *Viscoelasticity, *Stress relaxation, Polystyrene, Mathematical models
Subject Categories : Plastics
Distribution Statement : APPROVED FOR PUBLIC RELEASE