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