Touris Athanasios, Lee Sangwoo, Hillmyer Marc A, Bates Frank S
Department of Chemical Engineering & Materials Science, University of Minnesota, Minneapolis, Minnesota 55455, United States.
Department of Chemistry, University of Minnesota, Minneapolis, Minnesota 55455, United States.
ACS Macro Lett. 2012 Jun 19;1(6):768-771. doi: 10.1021/mz3002319. Epub 2012 Jun 6.
We report the anionic synthesis of poly(ethylene oxide--isoprene--ethylene oxide) (OIO') triblock copolymers and poly(ethylene oxide--styrene--butadiene--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'.
我们报道了使用三异丙基硅氧基-1-丙基锂（TIPSOPrLi）作为保护引发剂以及二苯甲基钾（DPMK）作为环氧乙烷（EO）聚合的碱活化剂，阴离子合成具有不对称尺寸聚环氧乙烷（PEO）端基嵌段的聚（环氧乙烷-异戊二烯-环氧乙烷）（OIO'）三嵌段共聚物和聚（环氧乙烷-苯乙烯-丁二烯-环氧乙烷）（OSBO'）四嵌段三元共聚物。所有最终产物和前体均通过尺寸排阻色谱法（SEC）和核磁共振（NMR）技术进行表征，证实了单峰且窄的分子量分布以及可控的摩尔质量。通过对从OIO'的臭氧分解获得的残余PEO嵌段的表征，进一步证明了独立可控的PEO嵌段的增长。
