Synthesis and characterization of new silicone condensation polymers
The LLNL has an active interest in the synthesis of new polysiloxanes as base polymers for cellular silicone materials in very specific design requirements. While the polymers which have been prepared via random equilibration of various cyclic tetrasiloxanes have adequate properties for certain applications, there is evidence to suggest that alternating block polysiloxanes prepared via condensation polymerization techniques have properties more desirable to our end uses as flexible foam materials. The synthetic sequence involves reactions of functionally terminated (amino and hydroxy) polysiloxane oligomers to produce alternating block (ABAB...) materials of high molecular weight dialkylamines as condensation by-products. The analysis and characterization of these block copolymers is reported upon. An additional topic of discussion is the functional endcapping of these poly(dimethyl-diphenyl-methyl vinyl) siloxane copolymers with dimethylvinylsilyl groups. This functional termination should provide a means of tying down any dangling polymer ends present through peroxide crosslinking.
- Research Organization:
- California Univ., Livermore (USA). Lawrence Livermore Lab.
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 5380431
- Report Number(s):
- UCRL-84304; CONF-800814-1; CONF-800628-3
- Country of Publication:
- United States
- Language:
- English
Similar Records
Experimental studies of siloxane polymers and their elastomeric networks
Effect of Diphenyl Content on Viscoelasticity of Poly(dimethyl-co-diphenyl)siloxane Melt and Network