Bromination of poly[1-(trimethylsilyl)-1-propyne] with different microstructures and properties of bromine-containing polymers

The interaction between poly1-(trimethylsilyl)-1-propyne] with different microstructures and bromine has been studied in carbon tetrachloride and chlorobenzene at 25–120°C. Depending on the process conditions, polymers containing up to 26 wt % bromine are formed; that is, every other unit of the polymer chain is brominated. Polymers enriched with cis structures are brominated through trimethylsilyl groups, and the process is unaccompanied by polymer chain degradation. The bromination of samples containing predominantly trans-structures is nonselective, and the reaction is accompanied by polymer degradation. The solubility of brominated poly1-(trimethylsilyl)-1-propyne] in different media and the gas permeability of films made of this polymer are estimated.