由聚丙二醇二缩水甘油醚和甘油通过质子转移聚合(proton transfer polymerization)一步法制备了端羟基的温敏性超支化聚醚.聚合产物的分子量(Mn)在1.76×104
2
.43×104之间
玻璃化转变温度(Tg)在-31.5
-
26.7℃之间
热分解温度(Td)在367
3
76℃之间.通过控制聚丙二醇二缩水甘油醚和甘油的投料比
实现了对温敏性超支化聚醚最低临界溶解温度(LCST)的调节
LCST可控制在28.3
3
9.6℃之间.
Abstract
The hyperbranched polyethers with hydroxyl end groups were prepared by one-step proton transfer polymerization of commercially available monomer poly(propylene glycol)diglycidyl ether and glycerol.The molecular structure of the hyperbranched polyethers was analyzed by 1H-NMR and 13C-NMR spectroscopy.The molecular weight of the obtained polymers ranges from 17600 to 24300
and the glass temperature ranges from-31.5℃ to-26.7℃
while the T_d ranges from 367℃ to 376℃.The obtained hyperbranched polyethers exhibited a LCST-type phase separation in water.The lower critical solution temperature(LCST)values can be tuned by controlling the feed molar ratio of poly(propylene glycol)diglycidyl ether to glycerol and the concentration of the polymer aqueous solutions.
关键词
超支化聚合物温敏性聚合物质子转移聚合
Keywords
Hyperbranched polymerTemperature-sensitive polymerProton transfer polymerization