Abstract
The synthesis and characterization of a new class of organosilicon polymers, the poly( m -xylylenesiloxanylenes) with general structure I, was undertaken as part of an investigation Figure options Download full-size image Download as PowerPoint slide of new viscoelastic, heat-resistant polymers with potential for development into broad use-temperature, fuel-resistant sealants. Representative members of 3 types of methyland 3,3,3-trifluoropropyl-substituted polymers within this class, namely poly(m-xylylenedisiloxanylenes) (I, x = 0), -trisiloxanylenes (I, x = 1), and -tetrasiloxanylenes (I, x = 2), were synthesized from α,α′-bis (hydroxydialkylsilyl)-m-xylenes by homopolymerization, as well as cocondensation reactions with bis-aminosilanes and -disiloxanes. Polymerization products were characterized with regard to chemical composition, molecular weight and glass-transition temperature, and evaluated for thermal stability and hydrocarbon fuel resistance. From the data, structure-property correlations were established to enable prediction of molecular structures of m-xylylene-, and possibly other arylenesiloxanylene polymers with optimum combinations of desired properties.
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