Structure and Viscosity of Poly(dimethylsiloxanes) with Random Branches

Enrique M. Valles, Chris Macosko

Research output: Contribution to journalArticle

92 Scopus citations

Abstract

Viscosity rise and extent of reaction were followed during the stepwise polymerization of vinyl-terminated poly(dimethylsiloxane) with tri- and tetrafunctional hydrosilanes. Gel point results and Mw data by light scattering agree with predictions from branching theory. This indicates that the influence of side reactions, substitution effects, and ring formation is small. The bulk viscosity of the branched molecules was found to correlate with the weight average molecular weight of the longest linear chain through the molecules, ML, w and with gMw where g is the ratio of branched to linear polymer radii of gyration.

Original languageEnglish (US)
Pages (from-to)521-526
Number of pages6
JournalMacromolecules
Volume12
Issue number3
DOIs
StatePublished - Jan 1 1979

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