Accession Number:

AD0742968

Title:

Aryleneperfluoroalkylene-Modified Polysiloxanes.

Descriptive Note:

Technical rept.,

Corporate Author:

ROYAL AIRCRAFT ESTABLISHMENT FARNBOROUGH (ENGLAND)

Personal Author(s):

• McLoughlin,V. C. R.
• Grattan,Patricia A.

Report Date:

1971-11-01

Pagination or Media Count:

33.0

Abstract:

Synthesis of alpha, omega-bis-m-hydroxydimethylsilylphenylperfluoroalkanes, where the perfluoroalkylene group is -CF22- or -CF23- are described. Polycondensations catalysed by hexylammonium 2-ethylhexanoate give the corresponding high molecular weight polysiloxanes. These polymers are elastomeric and more thermally stable than polydimethylsiloxane on a weight-loss basis. A vulcanisate of the polymer with -CF23- units is stronger than a conventional methyl silicone rubber vulcanisate, but its hot-wet stability needs to be improved. Possible modifications to reduce the glass transition temperature and help in vulcanisation are discussed. Author

Descriptors:

• *SILICONE PLASTICS
• *HALOCARBON PLASTICS
• SYNTHESIS(CHEMISTRY)
• SYNTHESIS(CHEMISTRY)
• ELASTOMERS
• FLUORINE COMPOUNDS
• POLYMERIZATION
• THERMAL STABILITY
• VULCANIZATES
• TRANSITION TEMPERATURE
• SILANES
• THERMOGRAVIMETRIC ANALYSIS
• MECHANICAL PROPERTIES
• UNITED KINGDOM

Subject Categories:

• Organic Chemistry
• Polymer Chemistry

Distribution Statement:

APPROVED FOR PUBLIC RELEASE