Properties of Networks Formed by End Linking of Poly(dimethylsiloxane)

Enrique M. Valles; Chris Macosko

doi:10.1021/ma60070a025

Properties of Networks Formed by End Linking of Poly(dimethylsiloxane)

Enrique M. Valles, Chris Macosko

Chemical Engineering and Materials Science

Research output: Contribution to journal › Article › peer-review

125 Scopus citations

Abstract

Networks with well-defined structures were prepared by end linking vinyl-terminated poly(dimethylsiloxane) chains with tri- and tetrafunctional silanes. Modulus and extent of reaction were followed continuously on several systems. If trapped entanglements are accounted for, the modulus rise can be modeled quantitatively with branching theory. The effect of entanglements is demonstrated by changing molecular weight of the chains and by dilution. Comparison of data between tri- and tetrafunctional cross-linkers indicates clearly the importance of junction mobility. The C₂Mooney-Rivlin constant is small. Sol fraction and swelling data are also in reasonable agreement with predictions from branching theory.

Original language	English (US)
Pages (from-to)	673-679
Number of pages	7
Journal	Macromolecules
Volume	12
Issue number	4
DOIs	https://doi.org/10.1021/ma60070a025
State	Published - Jan 1 1979

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abstract = "Networks with well-defined structures were prepared by end linking vinyl-terminated poly(dimethylsiloxane) chains with tri- and tetrafunctional silanes. Modulus and extent of reaction were followed continuously on several systems. If trapped entanglements are accounted for, the modulus rise can be modeled quantitatively with branching theory. The effect of entanglements is demonstrated by changing molecular weight of the chains and by dilution. Comparison of data between tri- and tetrafunctional cross-linkers indicates clearly the importance of junction mobility. The C2Mooney-Rivlin constant is small. Sol fraction and swelling data are also in reasonable agreement with predictions from branching theory.",

author = "Valles, {Enrique M.} and Chris Macosko",

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AU - Valles, Enrique M.

AU - Macosko, Chris

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N2 - Networks with well-defined structures were prepared by end linking vinyl-terminated poly(dimethylsiloxane) chains with tri- and tetrafunctional silanes. Modulus and extent of reaction were followed continuously on several systems. If trapped entanglements are accounted for, the modulus rise can be modeled quantitatively with branching theory. The effect of entanglements is demonstrated by changing molecular weight of the chains and by dilution. Comparison of data between tri- and tetrafunctional cross-linkers indicates clearly the importance of junction mobility. The C2Mooney-Rivlin constant is small. Sol fraction and swelling data are also in reasonable agreement with predictions from branching theory.

AB - Networks with well-defined structures were prepared by end linking vinyl-terminated poly(dimethylsiloxane) chains with tri- and tetrafunctional silanes. Modulus and extent of reaction were followed continuously on several systems. If trapped entanglements are accounted for, the modulus rise can be modeled quantitatively with branching theory. The effect of entanglements is demonstrated by changing molecular weight of the chains and by dilution. Comparison of data between tri- and tetrafunctional cross-linkers indicates clearly the importance of junction mobility. The C2Mooney-Rivlin constant is small. Sol fraction and swelling data are also in reasonable agreement with predictions from branching theory.

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ER -

Properties of Networks Formed by End Linking of Poly(dimethylsiloxane)

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