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Molecular Weight Dependence of Domain Structure in Silica-Siloxane Molecular Composites

Published online by Cambridge University Press:  15 February 2011

Tamara A. Ulibarri ,
Greg Beaucage ,
Dale W. Schaefer ,
Bernard J. Olivier  and
Roger A. Assink
Tamara A. Ulibarri
Affiliation:
Sandia National Laboratories, Albuquerque, NM 87185
Greg Beaucage
Affiliation:
Sandia National Laboratories, Albuquerque, NM 87185
Dale W. Schaefer
Affiliation:
Sandia National Laboratories, Albuquerque, NM 87185
Bernard J. Olivier
Affiliation:
Sandia National Laboratories, Albuquerque, NM 87185
Roger A. Assink
Affiliation:
Sandia National Laboratories, Albuquerque, NM 87185
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Abstract

A detailed investigation of the molecular weight dependence of silica growth in in situ filled polydimethylsiloxane/tetraethylorthosilicate (PDMS/TEOS) materials was conducted using small angle neutron scattering (SANS). Composite materials were produced by using TEOS to simultaneously produce the glassy filler phase and to crosslink linear, hydroxyl terminated PDMS of variable molecular weight, M. Correlated domains of glassy filler were produced. The morphology of the in situ filled material showed a definite dependence on the molecular weight of the precursor polymer. The scale, R, of the glassy domains follows de Gennes' description of phase separation in a crosslinked system (R ∝ M1/2).

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 274: Symposium R – Submicron Multiphase Materials , 1992 , 85
Copyright
Copyright © Materials Research Society 1992

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References

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