INVESTIGATION OF POSSIBLE METHODS FOR PREPARING NOVEL SILICON-BASED MONOMERS AND POLYMERS.
Abstract
This programme was initiated to synthessee polymers based on a silicon-carbon backbone which possess elastomeric properties combined with thermal stability. A major part of the programme has been devoted to the synthesis of block copolymers of silcarbane and siloxane structurru. Low molecular-weight silcarbane polymers with functional end-groups were synthesised by silicon hydride-silicon vinyl addition reactions, using the monomers 4,4'bis (dimethylsilyl) diphenyl ether and 4,4' bis (vinyldimethylsilyl) diphenyl ether, and also by the condensation of 1,2 bis (chlorodimethylsilyl) ethane with the di-Grignard reagent of diphenylether. The end groups of the polymers were hydrolysed to silanol groups and condensation of the silcarbane chains was effected thermally. The block copolymers did not attain molecular weights greatly in excess of 5,000. Polydiphenyleneethersiloxane was synthe sised in high molecular form by the catalytic condensation of 4,4'-bis (hydroxydimethylsilyl) diphenylether. Silcarbane polymers of various structures have been synthesised by reactions oo the silicon-hydride addition type or by the reaction of chlorosilanes with difunctional Grignard reagents. The diphenylene-ether siloxane polymer, (-Si(CH3)2 - C6H4OC6H4 Si(CH3)2-O-), showed outstanding stability. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 28, 1963
- Accession Number
- AD0412835
Entities
People
- N.c. Ross