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Title: Non-strinking siloxane polymers

Abstract

Cross-linked polymers formed by ring-opening polymerization of a precursor monomer of the general formula R[CH.sub.2 CH(Si(CH.sub.3).sub.2).sub.2 O].sub.2, where R is a phenyl group or an alkyl group having at least two carbon atoms. A cross-linked polymer is synthesized by mixing the monomer with a co-monomer of the general formula CH.sub.2 CHR.sup.2 (SiMe.sub.2).sub.2 O in the presence of an anionic base to form a cross-linked polymer of recurring units of the general formula R(Me.sub.2 SiOCH.sub.2 CHSiMe.sub.2).sub.2 [CH.sub.2 CHR.sup.2 (SiMe.sub.2).sub.2 O].sub.n, where R.sup.2 is hydrogen, phenyl, ethyl, propyl or butyl. If the precursor monomer is a liquid, the polymer can be directly synthesized in the presence of an anionic base to a cross-linked polymer containing recurring units of the general formula R(Me.sub.2 SiOCH.sub.2 CHSiMe.sub.2).sub.2. The polymers have approximately less than 1% porosity and are thermally stable at temperatures up to approximately 500.degree. C. The conversion to the cross-linked polymer occurs by ring opening polymerization and results in shrinkage of less than approximately 5% by volume.

Inventors:
 [1];  [1]
  1. (Albuquerque, NM)
Issue Date:
Research Org.:
SANDIA CORP
OSTI Identifier:
873755
Patent Number(s):
6235864
Assignee:
Sandia Corporation (Albuquerque, NM) SNL
DOE Contract Number:  
AC04-94AL85000
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
non-strinking; siloxane; polymers; cross-linked; formed; ring-opening; polymerization; precursor; monomer; formula; phenyl; alkyl; carbon; atoms; polymer; synthesized; mixing; co-monomer; chr; sime; presence; anionic; base; form; recurring; units; sioch; chsime; hydrogen; ethyl; propyl; butyl; liquid; directly; containing; approximately; porosity; thermally; stable; temperatures; 500; degree; conversion; occurs; results; shrinkage; volume; cross-linked polymer; carbon atoms; thermally stable; polymer containing; carbon atom; ring-opening polymerization; recurring units; /528/999/

Citation Formats

Loy, Douglas A., and Rahimian, Kamyar. Non-strinking siloxane polymers. United States: N. p., 2001. Web.
Loy, Douglas A., & Rahimian, Kamyar. Non-strinking siloxane polymers. United States.
Loy, Douglas A., and Rahimian, Kamyar. Mon . "Non-strinking siloxane polymers". United States. https://www.osti.gov/servlets/purl/873755.
@article{osti_873755,
title = {Non-strinking siloxane polymers},
author = {Loy, Douglas A. and Rahimian, Kamyar},
abstractNote = {Cross-linked polymers formed by ring-opening polymerization of a precursor monomer of the general formula R[CH.sub.2 CH(Si(CH.sub.3).sub.2).sub.2 O].sub.2, where R is a phenyl group or an alkyl group having at least two carbon atoms. A cross-linked polymer is synthesized by mixing the monomer with a co-monomer of the general formula CH.sub.2 CHR.sup.2 (SiMe.sub.2).sub.2 O in the presence of an anionic base to form a cross-linked polymer of recurring units of the general formula R(Me.sub.2 SiOCH.sub.2 CHSiMe.sub.2).sub.2 [CH.sub.2 CHR.sup.2 (SiMe.sub.2).sub.2 O].sub.n, where R.sup.2 is hydrogen, phenyl, ethyl, propyl or butyl. If the precursor monomer is a liquid, the polymer can be directly synthesized in the presence of an anionic base to a cross-linked polymer containing recurring units of the general formula R(Me.sub.2 SiOCH.sub.2 CHSiMe.sub.2).sub.2. The polymers have approximately less than 1% porosity and are thermally stable at temperatures up to approximately 500.degree. C. The conversion to the cross-linked polymer occurs by ring opening polymerization and results in shrinkage of less than approximately 5% by volume.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2001},
month = {1}
}

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