Controlled synthesis of star-shaped L-lactide polymers using new spirocyclic tin initiators
Controlled synthesis of star-shaped L-lactide polymers using new spirocyclic tin initiators
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DOI：
10.1021/bm020009o
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发表时间：
2002-07-01
影响因子：
6.2
通讯作者：
Albertsson, AC
中科院分区：
文献类型：
--
作者：
Finne, A;Albertsson, AC
通过季戊四醇乙氧基化物与二丁基锡氧化物的反应，合成了两种新型螺环锡引发剂。成功合成了引发剂，并用H-1 NMR和差示扫描量热法（DSC）对其进行了表征。1H-1 NMR谱显示了醚链中亚甲基质子的特征信号。此外，在L-丙交酯在氯仿中于60 ℃开环聚合的新引发剂的有用性进行了检查。L-丙交酯以20至500的单体与引发剂（[M]/[I]）比聚合。结果表明，引发是瞬时的，并且分子量分布非常窄，
The reaction between pentaerythritol ethoxylate compounds and dibutyltin oxide was developed as a route to synthesize two new spirocyclic tin initiators. The initiators were successfully synthesized and they were characterized by H-1 NMR and differential scanning calorimetry (DSC). The H-1 NMR spectra showed the characteristic signals for the methylene protons in the ether chains. Furthermore, the usefulness of the new initiators was examined in ring-opening polymerizations of L-lactide in chloroform at 60 degreesC. L-Lactide was polymerized at monomer-to-initiator ([M]/[I]) ratios between 20 and 500. The results indicated that the initiation was instantaneous and that the molecular weight distribution was very narrow,