New oligo(organocyclosiloxaalkanes): Synthesis, structure, and properties

Poly- and oligo(oxymethylcyclocarbosiloxanes) with variable disilaalkane fr agments in a cycle and the varying size of the cycle were synthesized by th e heterofunctional polycondensation of dichloro- and dihydroxyorganocyclosi loxaalkanes. The structure of the synthesized polymers was studied by H-1 a nd Si-29 NMR spectroscopy; the molecular mass characteristics of these poly mers were estimated, and their phase transition temperatures were determine d. The effect of the ratio of SiO : SiC groups on the capability of oligo- and poly-oxy(organocyclosiloxaalkane)diyls for self-organization in bulk an d in ultrathin films was investigated.