Non-strinking siloxane polymers
- Albuquerque, NM
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.
- Research Organization:
- Sandia National Laboratories (SNL), Albuquerque, NM, and Livermore, CA (United States)
- DOE Contract Number:
- AC04-94AL85000
- Assignee:
- Sandia Corporation (Albuquerque, NM)
- Patent Number(s):
- US 6235864
- OSTI ID:
- 873755
- Country of Publication:
- United States
- Language:
- English
Sol-Gel Chemistry by Ring-Opening Polymerization
|
journal | January 1999 |
Anionic polymerization of 2,2,5,5-tetramethyl-1-oxa-2,5-disilacyclopentane
|
journal | May 1974 |
| Shrinkage and recyclability of poly(1,2-ethylene-bis(dimethylsiloxane)) | report | August 1998 |
ChemInform Abstract: REACTION OF DISILANES WITH ACETYLENES. II. DOUBLE SILYLATION OF 1-HEXYNE, TRIMETHYLSILYLACETYLENE AND ACETYLENE WITH METHOXYMETHYLDISILANES CATALYZED BY TETRAKIS(TRIPHENYLPHOSPHINE)PALLADIUM
|
journal | December 1981 |
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Related Subjects
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/