On the polycondensation products of cis-(1,3,5,7-tetrahydroxy)-1,3,5,7-tetraphenylcyclo-tetrasiloxane☆

Abstract An investigation of the hydrodynamic and conformational parameters of polyphenylsilsesuioxanes (PPSSO) prepared by polycondensation of tetrol-T 4 in the absence of catalyst has shown that the polymer conforms to the following Mark-Kuhn-Houwink equation: [ n ] = 3·40 ± 1·26 × 10 −5 M 0.79+0.04 (in benzene at 20°). The Kuhn segment for PPSSO macromolecules found with the use of the Kirkwood-Riseman theory for semipermeable coils, and Yamakawa's theory for persistent chains is equal to 37 and 30 A respectively, which is less than the Kuhn segment value for PPSSO prepared by anionic polymerization.