Accession Number : AD0752622
Title : Viscoelastic Properties of Heterophase Blends of Homopolymers and Block Copolymers.
Descriptive Note : Technical rept.,
Corporate Author : CALIFORNIA UNIV BERKELEY DEPT OF CHEMICAL ENGINEERING
Personal Author(s) : Choi,G. ; Kaya,A. ; Shen,M.
Report Date : 15 NOV 1972
Pagination or Media Count : 27
Abstract : Stress relaxation and dynamic mechanical measurements were carried out for two types of heterophase polyblends. One is obtained by blending homopolymers of butadiene and styrene (high impact polystyrene of HIPS); the other by blending homopolymer of butadiene with a triblock copolymer of styrene-butadiene-styrene (SBS/B). It was found that for HIPS, time temperature superposition is difficult, and the shift factors cannot be adequately interpreted by a reasonable model. For SBS/B it is impossible to carry out superposition. Possible mechanisms giving rise to the new transition are discussed. (Author)
Descriptors : (*STYRENE PLASTICS, VISCOELASTICITY), MIXTURES, TRANSITION TEMPERATURE, ELASTOMERS, ADDITIVES, RUBBER, BONDING, COMPOSITE MATERIALS
Subject Categories : Plastics
Distribution Statement : APPROVED FOR PUBLIC RELEASE