Institute of Organic Chemistry, Johannes Gutenberg-University, Mainz, Germany.
Macromol Rapid Commun. 2011 Dec 1;32(23):1930-4. doi: 10.1002/marc.201100489. Epub 2011 Oct 4.
The lower critical solution temperature (LCST) behavior of novel poly(ethylene glycol) (PEG)-based copolymers bearing multiple functional groups, obtained by anionic ring-opening (co)polymerization (AROP), has been investigated. Variable comonomer ratios of ethylene oxide (EO) and the corresponding oxiranes isopropylidene glyceryl glycidyl ether (IGG), ethoxyl vinyl glycidyl ether (EVGE), allyl glycidyl ether (AGE), or N,N-dibenzyl amino glycidyl (DBAG), particularly designed to implement functional groups at the PEG backbone, were found to influence the LCST behavior. Sharp transitions from translucent to opaque solutions, comparable to other well-established stimuli-responsive polymers, were observed at temperatures ranging from 9 to 82 °C. The influence of the side group hydrophobicity could be quantified by the comparison of the different copolymer systems observed.
新型聚乙二醇（PEG）基嵌段共聚物的下临界溶液温度（LCST）行为通过阴离子开环（共聚）聚合（AROP）进行了研究。这些共聚物含有多种官能团，通过改变环氧乙烷（EO）和相应的环氧化物异丙叉甘油基缩水甘油醚（IGG）、乙氧基乙烯基缩水甘油醚（EVGE）、烯丙基缩水甘油醚（AGE）或 N,N-二苄基氨基缩水甘油（DBAG）的共聚单体比例，可以在 PEG 主链上实现不同的官能团。在 9 至 82°C 的温度范围内，观察到从半透明到不透明溶液的急剧转变，类似于其他成熟的刺激响应聚合物。通过比较观察到的不同共聚体系，可以定量评估侧基疏水性对 LCST 行为的影响。
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