Microhardness of styrene/butadiene block copolymer systems: Influence of molecular architecture

Autor:	Rameshwar Adhikari, M. E. Cagiao, Konrad Knoll, G. H. Michler, Sven Henning, I. Puente, F. J. Baltá-Calleja
Rok vydání:	2003
Předmět:	Materials science Styrene-butadiene Polymers and Plastics General Chemistry Indentation hardness Surfaces Coatings and Films Styrene chemistry.chemical_compound Polybutadiene chemistry Chemical engineering Phase (matter) Polymer chemistry Materials Chemistry Copolymer Polystyrene Glass transition
Zdroj:	Journal of Applied Polymer Science. 90:1670-1677
ISSN:	0021-8995
DOI:	10.1002/app.12837
Popis:	The influence of molecular architecture on the mechanical properties of styrene/butadiene block copol- ymers was investigated by means of the microhardness technique. It was found that the microhardness of the sty- rene/butadiene block copolymers is dictated by the nature of microphase separated morphology. In contrast to poly- mer blends and random copolymers, in which the micro- hardness generally follows the additivity rule, the behavior of the investigated block copolymers was found to signifi- cantly deviate depending on their molecular architecture. The glass-transition temperature of the polystyrene phase (Tg-PS), which practically remained constant and that of the polybutadiene phase (Tg-PB), which varied with the change in the block copolymer architecture, apparently do not in- fluence the microhardness values of the block copolymers. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 90: 1670 -1677, 2003
Databáze:	OpenAIRE
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