Viscoelastic Relaxation Times of a Homogeneous Block Copolymer.

摘要

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)