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Title: Structure-property relationships of linear methyl-phenyl-vinyl siloxane terpolymers

Abstract

LLNL has an active interest in the synthesis and characterization of siloxane polymers with properties tailored to meet specific design requirements. We have synthesized a series of 15 random terpolymers of dimethyl-diphenyl-methylvinyl siloxane. In seven terpolymers the concentration of the methylvinyl repeat unit was varied from 0 to 5 weight percent maintaining phenyl content constant at 12 percent. The other eight terpolymers contained 0 to 18 weight percent phenyl repeat unit maintaining vinyl at one percent. As nearly as possible comparable molecular weights (5 x 10/sup 5/) were maintained. The gum stocks were reinforced with approx. 25 percent fumed silica. Silicones of different vinyl content were cured with a vinyl specific peroxide and characterized by swelling and mechanical properties. The moduli increased directly with vinyl concentration, but the longation to break decreased until at about two percent vinyl the rubber becomes extremely friable. Increasing the phenyl content in the silicone decreased the degree of crystallinity and increases the polymer class transition in accord with theoretical predictions. The major effect of incorporation of phenyl groups is the elimination of the polymer's ability to crystallize at about three percent phenyl. This extends the rubbery plateau to the glass transition (-117/sup 0/C) insteadmore » of the melting point (-44/sup 0/C).« less

Authors:
; ; ; ;
Publication Date:
Research Org.:
California Univ., Livermore (USA). Lawrence Livermore Lab.
OSTI Identifier:
5380439
Report Number(s):
UCRL-84303; CONF-800814-2; CONF-800628-2
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Conference
Resource Relation:
Conference: American chemical society meeting, San Francisco, CA, USA, 24 Aug 1980
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; RUBBERS; SYNTHESIS; SILOXANES; GLASS; MELTING POINTS; POLYMERS; SILICONES; VINYL RADICALS; ALKYL RADICALS; ELASTOMERS; ORGANIC COMPOUNDS; ORGANIC POLYMERS; PHYSICAL PROPERTIES; RADICALS; THERMODYNAMIC PROPERTIES; TRANSITION TEMPERATURE; 360401* - Polymers & Plastics- Preparation & Fabrication- (-1987)

Citation Formats

Hammon, H G, Hoffman, D M, S, Jessop E, Kolb, J R, and Riley, M O. Structure-property relationships of linear methyl-phenyl-vinyl siloxane terpolymers. United States: N. p., 1980. Web.
Hammon, H G, Hoffman, D M, S, Jessop E, Kolb, J R, & Riley, M O. Structure-property relationships of linear methyl-phenyl-vinyl siloxane terpolymers. United States.
Hammon, H G, Hoffman, D M, S, Jessop E, Kolb, J R, and Riley, M O. Thu . "Structure-property relationships of linear methyl-phenyl-vinyl siloxane terpolymers". United States. https://www.osti.gov/servlets/purl/5380439.
@article{osti_5380439,
title = {Structure-property relationships of linear methyl-phenyl-vinyl siloxane terpolymers},
author = {Hammon, H G and Hoffman, D M and S, Jessop E and Kolb, J R and Riley, M O},
abstractNote = {LLNL has an active interest in the synthesis and characterization of siloxane polymers with properties tailored to meet specific design requirements. We have synthesized a series of 15 random terpolymers of dimethyl-diphenyl-methylvinyl siloxane. In seven terpolymers the concentration of the methylvinyl repeat unit was varied from 0 to 5 weight percent maintaining phenyl content constant at 12 percent. The other eight terpolymers contained 0 to 18 weight percent phenyl repeat unit maintaining vinyl at one percent. As nearly as possible comparable molecular weights (5 x 10/sup 5/) were maintained. The gum stocks were reinforced with approx. 25 percent fumed silica. Silicones of different vinyl content were cured with a vinyl specific peroxide and characterized by swelling and mechanical properties. The moduli increased directly with vinyl concentration, but the longation to break decreased until at about two percent vinyl the rubber becomes extremely friable. Increasing the phenyl content in the silicone decreased the degree of crystallinity and increases the polymer class transition in accord with theoretical predictions. The major effect of incorporation of phenyl groups is the elimination of the polymer's ability to crystallize at about three percent phenyl. This extends the rubbery plateau to the glass transition (-117/sup 0/C) instead of the melting point (-44/sup 0/C).},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1980},
month = {5}
}

Conference:
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