Elastomers having molecular weights above 1 million made by twostage polymerization. Two-stage process proves far more successful than synthesis from reactive monomers. Process involves synthesis of silanolterminated prepolymer and subsequent extension of prepolymer chain with additional aminosilane monomer. Multistage method allows chain-extending monomer added in precise amounts between stages.
Ultra-High-Molecular-Weight Silphenylene/Siloxane Polymers
NASA Tech Briefs ; 9 , 4
1986-03-01
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Englisch
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