Synthesis and ring-opening polymerization of γ-substituted ε-caprolactone monomers containing octyloxy and 2-[2-(2-methoxyethoxy)ethoxy]ethoxy functional groups is reported. An amphiphilic block copolymer containing hydrophobic poly(γ-octyloxy-ε-caprolactone) and hydrophilic polyγ-2-[2-(2-methoxyethoxy)ethoxy]ethoxy-ε-caprolactone} forms micelles in aqueous solution above the critical micellar concentration of 1.74 à 10â3 g Lâ1. Polyγ-2-[2-(2-methoxyethoxy)ethoxy]ethoxy-ε-caprolactone} and its block copolymer with poly(γ-octyloxy-ε-caprolactone) are thermoresponsive polymers. The LCST measured for polyγ-2-[2-(2-methoxyethoxy)ethoxy]ethoxy-ε-caprolactone} is 47.5 °C, while the LCST decreased to 37.5 °C for the amphiphilic block copolymer polyγ-2-[2-(2-methoxyethoxy)ethoxy]ethoxy-ε-caprolactone}-b-poly(γ-octyloxy-ε-caprolactone).
报道了含有辛氧基和2-[2-(2-甲氧基乙氧基)乙氧基]乙氧基官能团的γ-取代
ε-己内酯单体的合成和开环聚合。含有疏
水性聚(γ-辛氧基-
ε-己内酯)和亲
水性聚γ-2-[2-(2-甲氧基乙氧基)乙氧基]乙氧基-
ε-己内酯}的两亲性嵌段共聚物在高于临界胶束浓度的
水溶液中形成胶束1.74 × 10 × 3 g L × 1。聚γ-2-[2-(2-甲氧基乙氧基)乙氧基]乙氧基-
ε-己内酯}及其与聚(γ-辛氧基-
ε-己内酯)的嵌段共聚物是热响应性聚合物。测得的聚γ-2-[2-(2-甲氧基乙氧基)乙氧基]乙氧基-
ε-己内酯}的LCST为47.5℃,而两亲性嵌段共聚物聚γ-的LCST降低至37.5℃。 2-[2-(2-甲氧基乙氧基)乙氧基]乙氧基-
ε-己内酯}-b-聚(γ-辛氧基-
ε-己内酯)。