异端基遥爪聚乙二醇的合成

采用3种新式引发剂，即2-(苄氧基）乙醇钾、2-(四氢-2H-吡喃-2-氧基)乙醇钾、单丙烯基乙二醇钾引发环氧乙烷阴离子开环聚合，反应条件为25 ℃、48 h、醇与萘钾摩尔比例1∶1，得到3种异端基遥爪聚乙二醇。以2-(苄氧基）乙醇钾引发聚合所得产物为起始物，经一系列反应，得到两种两端均为活性基团的异端基遥爪聚乙二醇，这种方法具有普适性。通过1HNMR及GPC手段，表征了产物的结构、分子量及分子量分布。结果表明可以得到高产率、分子量可控且分布窄的异端基遥爪聚乙二醇。

Synthesis of hetero telechelic poly(ethylene glycol)

Three hetero telechelic poly(ethylene glycol)s were obtained via anionic ring-opening polymerization of ethylene oxide using three new initiators ：2-(benzyloxy)ethanol potassium、2-(tetrahydro-2H-pyran-2-yloxy)ethanol potassium，2-allyloxyethanol potassium. The polymerization conditions were as follows：25 ℃，48 h，with equal ethanol and potassium naphthalene feeds. Using the polymerized product from 2-(benzyloxy)ethanol potassium as the start substance，two hetero telechelic poly(ethylene glycol)s with two functional end groups were synthesized through a series of reactions，the method was widely applicable to synthesizing hetero telechelic poly(ethylene glycol)s. The chemical structure，weight average molecular weight and distribution of the resultant products were characterized by 1H-NMR and GPC. The hetero telechelic poly(ethylene glycol)s that have high yields and controlled molecular weights and molecular weight distributions were obtained.