Critical extent of reaction of a polydimethylsiloxane polymer network

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

doi:10.1016/0032-3861(89)90253-X

Critical extent of reaction of a polydimethylsiloxane polymer network

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

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

41 Scopus citations

Abstract

A direct rheological technique was used to measure the critical time for gelation, t_c, of a well characterized polydimethylsiloxane (PDMS) polymer network. This technique is based on the observation that the gel point of crosslinking systems occurs at the instant at which the viscoelastic behaviour reduces to power-law relaxation (critical state described by the gel equation). The extent of reaction, p(t), was measured by a Fourier-transform infra-red method. The measured value of the critical extent of reaction, p_c = p(t_c) = 0.57 ± 0.01, agrees extremely well with the value predicted by mean-field theory. This agreement is an independent confirmation of the observation that power-law relaxation is a property of the polymer at the gel point.

Original language	English
Pages (from-to)	2222-2226
Number of pages	5
Journal	Polymer
Volume	30
Issue number	12
DOIs	https://doi.org/10.1016/0032-3861(89)90253-X
State	Published - 1 Jan 1989
Externally published	Yes

Keywords

crosslinking polymer
gel equation
gel point
polydimethyl siloxane

ASJC Scopus subject areas

Organic Chemistry
Polymers and Plastics
Materials Chemistry

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10.1016/0032-3861(89)90253-X

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title = "Critical extent of reaction of a polydimethylsiloxane polymer network",

abstract = "A direct rheological technique was used to measure the critical time for gelation, tc, of a well characterized polydimethylsiloxane (PDMS) polymer network. This technique is based on the observation that the gel point of crosslinking systems occurs at the instant at which the viscoelastic behaviour reduces to power-law relaxation (critical state described by the gel equation). The extent of reaction, p(t), was measured by a Fourier-transform infra-red method. The measured value of the critical extent of reaction, pc = p(tc) = 0.57 ± 0.01, agrees extremely well with the value predicted by mean-field theory. This agreement is an independent confirmation of the observation that power-law relaxation is a property of the polymer at the gel point.",

keywords = "crosslinking polymer, gel equation, gel point, polydimethyl siloxane",

author = "Venkataraman, {Sundar K.} and Larry Coyne and Francois Chambon and Moshe Gottlieb and Winter, {H. Henning}",

note = "Funding Information: The authors gratefully acknowledge the valuable assistancoef ReginaD orn at the Max-Planck-Institufitir PolymerforschunMg,a inz, West Germanyf,o r the g.p.c. and v.p.o, measurementas,n d of Dr S. Curran of the Monsanto Chemical Co. for the functionalitym easure-ments. The study is supportedb y the Center for the University of MassachusettsI ndustry Research in Polymersa nd by NSF Grant MSM 8601595.",

year = "1989",

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doi = "10.1016/0032-3861(89)90253-X",

language = "English",

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T1 - Critical extent of reaction of a polydimethylsiloxane polymer network

AU - Venkataraman, Sundar K.

AU - Coyne, Larry

AU - Chambon, Francois

AU - Gottlieb, Moshe

AU - Winter, H. Henning

N1 - Funding Information: The authors gratefully acknowledge the valuable assistancoef ReginaD orn at the Max-Planck-Institufitir PolymerforschunMg,a inz, West Germanyf,o r the g.p.c. and v.p.o, measurementas,n d of Dr S. Curran of the Monsanto Chemical Co. for the functionalitym easure-ments. The study is supportedb y the Center for the University of MassachusettsI ndustry Research in Polymersa nd by NSF Grant MSM 8601595.

PY - 1989/1/1

Y1 - 1989/1/1

N2 - A direct rheological technique was used to measure the critical time for gelation, tc, of a well characterized polydimethylsiloxane (PDMS) polymer network. This technique is based on the observation that the gel point of crosslinking systems occurs at the instant at which the viscoelastic behaviour reduces to power-law relaxation (critical state described by the gel equation). The extent of reaction, p(t), was measured by a Fourier-transform infra-red method. The measured value of the critical extent of reaction, pc = p(tc) = 0.57 ± 0.01, agrees extremely well with the value predicted by mean-field theory. This agreement is an independent confirmation of the observation that power-law relaxation is a property of the polymer at the gel point.

AB - A direct rheological technique was used to measure the critical time for gelation, tc, of a well characterized polydimethylsiloxane (PDMS) polymer network. This technique is based on the observation that the gel point of crosslinking systems occurs at the instant at which the viscoelastic behaviour reduces to power-law relaxation (critical state described by the gel equation). The extent of reaction, p(t), was measured by a Fourier-transform infra-red method. The measured value of the critical extent of reaction, pc = p(tc) = 0.57 ± 0.01, agrees extremely well with the value predicted by mean-field theory. This agreement is an independent confirmation of the observation that power-law relaxation is a property of the polymer at the gel point.

KW - crosslinking polymer

KW - gel equation

KW - gel point

KW - polydimethyl siloxane

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U2 - 10.1016/0032-3861(89)90253-X

DO - 10.1016/0032-3861(89)90253-X

M3 - Article

AN - SCOPUS:0024905172

SN - 0032-3861

VL - 30

SP - 2222

EP - 2226

JO - Polymer

JF - Polymer

IS - 12

ER -

Critical extent of reaction of a polydimethylsiloxane polymer network

Abstract

Keywords

ASJC Scopus subject areas

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