Copolymers containing diethylsiloxane and functional siloxane groups of the form RR'SiO (where R, R'= phenyl, and R = methyl, R'= 3,3,3-trifluoropropyl) were synthesized by equilibrium polymerization of the appropriate cyclotrisiloxanes in the presence of KOH. Quantitative 29Si n.m.r, spectroscopy indicated that the copolymers possessed random microstructures. D.s.c. and dynamic mechanical analysis show that both substituents are effective in lowering the crystal melting and low-temperature crystal-crystal transitions with respect to the diethylsiloxane homopolymer, and ultimately lead to non-crystalline copolymers.
Посилання на статтю:
Poly(diethylsiloxane-co-diphenylsiloxane) and poly(diethylsiloxane-co-3,3,3- trifluoropropylmethylsiloxane): synthesis, characterization and low-temperature properties / J. R. Brewer*, K. Tsuchihara and R. Morita and J. R. Jones and J. P. Bloxsidge // Polymer. – 1994. – Vol 35. – P. 5109-5117.