Time-Temperature Superposition in Styrene/Butadiene/Styrene Block Copolymers

Autor:	D. G. Fesko, N. W. Tschoegl
Rok vydání:	1974
Předmět:	Materials science Styrene-butadiene Polymers and Plastics General Chemical Engineering Kraton Analytical Chemistry Styrene chemistry.chemical_compound Polybutadiene chemistry Time–temperature superposition Phase (matter) Polymer chemistry Copolymer Polystyrene Composite material
Zdroj:	International Journal of Polymeric Materials. 3:51-79
ISSN:	1563-535X 0091-4037
DOI:	10.1080/00914037408072375
Popis:	The dynamic mechanical response of a styrene/butadiene/styrene (SBS) block copolymer with segment molecular weights of 16,000/78,000/16,000 (designated as Shell 16/78/16) was determined at various temperatures between -83 and +86°C at frequencies between 0.1 and 1000 Hz. The data were shifted into a master curve according to a procedure developed for thermorheologically complex materials and utilizing an additive compliance model. Data on two other triblock copolymers, Kraton 102, and an SBS triblock copolymer exhibiting a continuous polystyrene phase (designated NBS 10/30/10), are also presented. A noteworthy feature of all three triblock copolymers is a long-drawn-out intertransition plateau in which the modulus changes very little for many decades of time. The modulus is high because of the presence of the polystyrene phase and trapped entanglements in the polybutadiene phase. The extent of the plateau, effectively the distance between the two glass transitions, depends on temperature because ...
Databáze:	OpenAIRE
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