Liquid-crystalline polymers containing heterocycloalkane mesogenic groups. 5. Synthesis of biphasic chiral smectic polysiloxanes containing 2,5-disubstituted-1,3-dioxane- and 2,5-disubstituted-1,3,2-dioxaborinane-based mesogenic groups

摘要: Abstract : The synthesis of side-chain liquid crystalline polysiloxanes containing chiral mesogenic side-groups, is presented. Differential scanning calorimetry and optical polarization microscopy revealed smectic mesomorphism for all polymers. last two polymers present also a smectic-C mesophase. All copolymers exhibit glass transition temperatures; one due to the independent motion main chain, other cooperative but side-groups. Therefore, these are biphasic systems resembling behavior phase separated graft copolymers, i.e., they micro-phase morphology main-chain domains.