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5710457 
Journal Article 
VISCOSITY REDUCTION OF STYRENE-BUTADIENE-STYRENE BLOCK CO-POLYMER MELTS - PLASTICIZATION OF THE INTERPHASE 
Sivashinsky, N; Soong, DS 
1983 
Journal of Polymer Science, Part B: Polymer Letters
ISSN: 0449-2986 
21 
6 
459-465 
English 
WOS:A1983QT41900010 
Recognition of the origin of the anomalously high eta inspired the present work, which aims at finding an effective means to reduce eta encountered in the melt processing of styrene-butadiene-styrene (SBS). To achieve this goal, a small amount of relatively short styrene-butadiene-rubber (SBR) molecules was added into SBS. The added SBR is expected to reside primarily in the mixed interphase, presumably due to its thermodynamic compatibility with the interphase and its short-chain nature allowing itself to be accomodated in the region. The interpretation offered for the observed viscosity reduction of SBS via the addition of a small amount of SBR hinges on the assumption that the added SBR resides primarily in the interphase region. Dynamic mechanical measurements of the pure SBS and SBS-SBR blends provided the needed evidence to support this assumption.