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首页> 外文期刊>Journal of Applied Polymer Science >Synthesis and characterization of polystyrene-b-poly(ethylene oxide)-b-polystyrene triblock copolymers by atom-transfer radical polymerization
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Synthesis and characterization of polystyrene-b-poly(ethylene oxide)-b-polystyrene triblock copolymers by atom-transfer radical polymerization

机译：原子转移自由基聚合法合成聚苯乙烯-b-聚环氧乙烷-b-聚苯乙烯三嵌段共聚物及其表征

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摘要

Well-defined polystyrene (PS)-b-poly(ethylene oxide) (PEO)-b-PS triblock copolymers were synthesized by atom-transfer radical polymerization (ATRP), using C-X-end-group PEO as macroinitiators. The triblock copolymers were characterized by infrared spectroscopy, nuclear magnetic resonance spectroscopy, and gel permeation chromatography. The experimental results showed that the polymerization was controlled/living. It was found that when the number-average molecular weight of the macroinititors increased from 2000 to 10,000, the molecular weight distribution of the triblock copolymers decreased roughly from 1.49 to 1.07 and the rate of polymerization became much slower. The possible polymerization mechanism is discussed. According to the Cu content measured with atomic absorption spectrometry, the removal of catalysts, with CHCl3 as the solvent and kaolin as the in situ absorption agent, was effective. (C) 2000 John Wiley & Sons, Inc. [References: 18]
机译：以C-X-端基PEO为大分子引发剂，通过原子转移自由基聚合（ATRP）合成了定义明确的聚苯乙烯-b-聚环氧乙烷（PEO）-b-PS三嵌段共聚物。通过红外光谱，核磁共振光谱和凝胶渗透色谱对三嵌段共聚物进行表征。实验结果表明，该聚合反应是受控的/活性的。发现当大分子引发剂的数均分子量从2000增加到10,000时，三嵌段共聚物的分子量分布从1.49大致降低到1.07，并且聚合速率变得非常慢。讨论了可能的聚合机理。根据用原子吸收光谱法测量的Cu含量，以CHCl 3为溶剂和高岭土为原位吸收剂的催化剂的去除是有效的。 （C）2000 John Wiley＆Sons，Inc. [参考：18]

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