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