Gel point of a PDMS model network polymer: Comparison of experiment with model predictions

Sundar K. Venkataraman, Larry Coyne, Francois Chambon, Moshe Gottlieb, H. Henning Winter

Research output: Contribution to journalConference articlepeer-review

Abstract

A model network polymer was used to measure the critical extent of reaction, pc, at the liquid-solid transition point, the gel point. The model polymer system is composed of a vinyl-terminated polydimethylsiloxane (PDMS) prepolymer and a siloxane crosslinker with an average functionality very close to the ideal value of 4. Molecular weight of the PDMS as measured by GPC agrees with values from intrinsic viscosity and Vapor Pressure Osmometry (VPO). The gel point of the crosslinking system was defined as the instant at which the viscoelastic sample exhibits power law behavior. The extent of reaction pc=p(tc) was measured by FTIR, and compared to the value predicted by mean field theories. The measured value of pc=0.5775±0.01 agrees extremely well with the predicted value.

Original languageEnglish
Pages (from-to)367
Number of pages1
JournalPolymeric Materials Science and Engineering, Proceedings of the ACS Division of Polymeric Materials Science and Engineering
Volume58
StatePublished - 1 Dec 1988
Externally publishedYes
EventThird Chemical Congress of North America - Toronto, Ont, Can
Duration: 6 Jun 198810 Jun 1988

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