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Viscoelastic properties of heterophase blends of homopolymers and block copolymers
Author(s) -
Choi G.,
Kaya A.,
Shen M.
Publication year - 1973
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.760130311
Subject(s) - materials science , copolymer , viscoelasticity , styrene butadiene , polystyrene , superposition principle , dissipation factor , composite material , styrene , relaxation (psychology) , modulus , glass transition , dynamic mechanical analysis , time–temperature superposition , dynamic modulus , stress relaxation , polymer , creep , dielectric , psychology , social psychology , physics , optoelectronics , quantum mechanics
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 or 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. Modulus‐temperature and loss tangent curves determined by dynamic mechanical experiments indicate the presence of new transition near −40°C. Possible mechanisms giving rise to this new transition are discussed.