FREE-RADICAL-INITIATED POLYMERIZATION OF 6-MALEIMIDOCHOLESTERYLHEXANOATE AND 4-MALEIMIDOCHOLESTERYLBENZOATE AND COPOLYMERIZATION WITH α-METHYLSTYRENE

摘要

Synthesis and free-radical-initiated homopolymerization of 6-maleimidocholesterylhexanoate (MIChHex) and 4-maleimidocholeste-rylbenzoate (MIChBenz) and copolymerization with α-methylstyrene (α-MeSt) are described. Monomers and α-MeSt form charge-transfer (CT) complexes with equilibrium constants: K_(MIChHex/α-MeSt) = 0.06 L·mol~(-1) and K_(MIChBenz/α-MeSt) = 0.05 L·mol~(-1). The mechanism based on the participation of CT complex best explains the formation of alternating copolymers. Homopolymers and copolymers are film-forming materials which are stable up to 330℃ under the conditions of TGA. T_gs and other thermal transitions are below the decomposition temperature.