Synthesis of Tri- and Multiblock Polymers with Asymmetric Poly(ethylene oxide) End Blocks.
Synthesis of Tri- and Multiblock Polymers with Asymmetric Poly(ethylene oxide) End Blocks.
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DOI：
10.1021/mz3002319
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发表时间：
2012-06
影响因子：
5.8
通讯作者：
A. Touris;Sangwoo Lee;M. Hillmyer;F. Bates
中科院分区：
文献类型：
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作者：
A. Touris;Sangwoo Lee;M. Hillmyer;F. Bates
本文报道了以三异丙基硅氧基-1-丙基锂（TIPSOPrLi）为保护引发剂，二苯基甲基钾（DPMK）为碱性活化剂，阴离子合成具有不对称尺寸聚环氧乙烷（PEO）末端嵌段的聚（环氧乙烷-b-异戊二烯-b-环氧乙烷）（OIO‘）三嵌段共聚物和聚（环氧乙烷-b-苯乙烯-b-丁二烯-b-环氧乙烷）（OSBO’）四嵌段共聚物。所有的最终产物和前驱体都通过尺寸排斥色谱（SEC）和核磁共振（NMR）技术进行了表征，证实了单峰和窄分子量分布和可控的摩尔质量。臭氧分解得到的残余PEO块的表征也证明了独立控制的PEO块的生长。
We report the anionic synthesis of poly(ethylene oxide-b-isoprene-b-ethylene oxide) (OIO') triblock copolymers and poly(ethylene oxide-b-styrene-b-butadiene-b-ethylene oxide) (OSBO') tetrablock terpolymers with asymmetrically sized poly(ethylene oxide) (PEO) end blocks using triisopropylsilyloxy-1-propyllithium (TIPSOPrLi) as a protected initiator and diphenylmethyl potassium (DPMK) as the base activator for EO polymerization. All final products and precursors were characterized by size exclusion chromatography (SEC) and nuclear magnetic resonance (NMR) techniques confirming monomodal and narrow molecular weight distributions and controlled molar masses. The growth of independently controlled PEO blocks was additionally demonstrated by the characterization of residual PEO blocks obtained from the ozonolysis of OIO'.