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首页> 外文期刊>Macromolecular symposia >Triblock and radial star-block copolymers comprised of poly(ethoxyethyl glycidyl ether), polyglycidol, poly(propylene oxide) and polystyrene obtained by anionic polymerization initiated by Cs initiators
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Triblock and radial star-block copolymers comprised of poly(ethoxyethyl glycidyl ether), polyglycidol, poly(propylene oxide) and polystyrene obtained by anionic polymerization initiated by Cs initiators

机译：由Cs引发剂引发的阴离子聚合获得的三嵌段和星形星形嵌段共聚物，由聚乙氧基乙基缩水甘油醚，聚缩水甘油，聚环氧丙烷和聚苯乙烯组成

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The anionic polymerization of ethoxyethyl glycidyl ether (EEGE) initiated by cesium alkoxide was studied. The ring-opening polymerization of EEGE in the presence of cesium alkoxide of 1-methoxy-2-ethanol does not involve any side reactions. The presence of an additional alcohol leads to a significant increase of the initiator efficiency.Aqueous solutions of poly (ethoxyethyl glycidyl ether) (PEEGE) exhibit lower critical solution temperature (LCST), and the polymer solubility in water is extremely sensitive to its MW. Two novel types of block copolymers based on PEEGE were synthesized: triblock-copolymers of ABA (A'BA') structure, where A is the PEEGE block, A' polyglycidol (PG) and B the polypropylene oxide (PPO) block, and A(2)S (A'S-2) and A(4)S (A'S-4) heteroarm stars, where S is the polystyrene block.The synthesis of the ABA block was performed by polymerization of EEGE initiated by bi-functional PPO/Cesium alkoxide macroinitiator. The PEEGE blocks were converted into PG blocks by successful cleavage of the ethoxyethyl group.Polystyrene/PEEGE and polystyrene/PG three- and five- heteroarm star copolymers were synthesized by a coupling reaction between well-defined chain-end-functionalized polystyrenes carying dendritic benzyl bromide moieties with living anionic polymers of PEEGE with one cesium alkoxide terminal group. The coupling reaction proceeds quantitatively without any side reactions, and thus series of starbranched polymers can be systematically synthesized. Polystyrenes with two or four PG arms have been obtained after the cleavage of the protecting group. The compact structure of these multi-arm star polymers and their amphiphilic character leads to the formation of nanoparticles in aqueous solution with rather uniform size distribution and a mean diameter of 15 nm.
机译：研究了由铯醇盐引发的乙氧基乙基缩水甘油醚（EEGE）的阴离子聚合。 EEGE在1-甲氧基-2-乙醇的铯醇盐的存在下的开环聚合反应不涉及任何副反应。额外的醇的存在导致引发剂效率的显着提高。聚（乙氧基乙基缩水甘油醚）（PEEGE）的水溶液显示出较低的临界溶液温度（LCST），并且聚合物在水中的溶解度对其MW极为敏感。合成了两种基于PEEGE的新型嵌段共聚物：ABA（A'BA'）结构的三嵌段共聚物，其中A为PEEGE嵌段，A'聚缩水甘油（PG）和B为聚环氧丙烷（PPO）嵌段，以及A （2）S（A'S-2）和A（4）S（A'S-4）杂星，其中S是聚苯乙烯嵌段。醇盐大分子引发剂。通过将乙氧基乙基成功裂解，将PEEGE嵌段转变为PG嵌段。带有带有一个铯铯端基的PEEGE活性阴离子聚合物的溴化物部分。偶联反应定量地进行而没有任何副反应，因此可以系统地合成一系列星形支化的聚合物。切割保护基后，已获得具有两个或四个PG臂的聚苯乙烯。这些多臂星形聚合物的致密结构及其两亲特性导致在水溶液中形成纳米粒子，纳米粒子的粒度分布相当均匀，平均直径为15 nm。

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