Dynamic Mechanical and Morphological Studies of Homopolymer/Block Copolymer Blends.
Abstract
A triblock copolymer of styrene-butadiene-styrene (SBS) was blended with a high and a low molecular weight polybutadiene (designated as PB(H) and PB(L) respectively). Electron micrographs of these blends show that PB(L) was solubilized into the butadiene domains of the SBS; while PB(H) was present in a separate phase. Dynamic mechanical data of the SBS/PB(L) blends indicate the presence of an intermediate loss peak between those of the glass transitions of the styrene and butadiene blocks in SBS, which can be attributed to the slippage of untrapped entanglements of PB(L) chains. Similar data for blends containing PB(H) also shows an intermediate loss peak, which is, however, due to crystallization and melting of the poly-cis-butadiene chains. Dynamic mechanical data for crosslinked blends were also taken for comparison.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 15, 1975
- Accession Number
- ADA004643
Entities
People
- L. Toy
- M. Niinomi
- Meikun Shen
Organizations
- University of California, Berkeley