Viscoelastic properties of heterophase blends of homopolymers and block copolymers
1973; Wiley; Volume: 13; Issue: 3 Linguagem: Inglês
10.1002/pen.760130311
ISSN1548-2634
AutoresGwangyong Choi, Ahmet Kaya, M. Shen,
Tópico(s)Asphalt Pavement Performance Evaluation
ResumoAbstract 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.
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