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Supramolecular Four-Armed Star A2B2 Copolymer (Miktoarm Star) via Host–Guest Complexation and Nitroxide-Mediated Radical Polymerization
Macromolecules ( IF 5.1 ) Pub Date : 2020-07-01 , DOI: 10.1021/acs.macromol.9b02511 Minjae Lee 1, 2 , Harry W. Gibson 1
Macromolecules ( IF 5.1 ) Pub Date : 2020-07-01 , DOI: 10.1021/acs.macromol.9b02511 Minjae Lee 1, 2 , Harry W. Gibson 1
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A supramolecular four-armed star copolymer was prepared from the pseudorotaxane complex of a crown-centered polystyrene and a bis(2,2,6,6-tetramethylpiperidinyl-1-oxy) viologen compound and n-butyl methacrylate (BMA) by nitroxide-mediated polymerization of the latter. Solvent fractionation with dioxane/THF/MeOH removed a small amount of a high molecular weight poly(BMA) homopolymer. The molecular weight increase from its monomodal size exclusion chromatographic trace gives direct evidence of the four-armed star copolymer formation; there is no residual starting polystyrene. NMR spectroscopy shows the two components of the copolymer and confirms the presence of the central [2]rotaxane unit. Differential scanning calorimetry displays two glass-transition temperatures, which correspond closely to those of polystyrene and poly(BMA).
中文翻译：
超分子四臂星形A 2 B 2共聚物（Miktoarm星形）通过主客体络合和一氧化氮介导的自由基聚合
由冠中心聚苯乙烯和双（2,2,6,6-四甲基哌啶基-1-氧基）紫精化合物和n的拟轮烷配合物制备超分子四臂星形共聚物甲基丙烯酸丁酯（BMA）是通过硝基氧化物介导的聚合反应。用二恶烷/ THF / MeOH进行溶剂分馏除去了少量的高分子量聚（BMA）均聚物。从其单峰尺寸排阻色谱图可知，分子量的增加直接证明了四臂星形共聚物的形成。没有残留的起始聚苯乙烯。NMR光谱显示了共聚物的两种成分，并证实了[2]轮烷中心单元的存在。差示扫描量热法显示两个玻璃化转变温度，这与聚苯乙烯和聚（BMA）的温度非常接近。
更新日期：2020-07-14
中文翻译：
超分子四臂星形A 2 B 2共聚物（Miktoarm星形）通过主客体络合和一氧化氮介导的自由基聚合
由冠中心聚苯乙烯和双（2,2,6,6-四甲基哌啶基-1-氧基）紫精化合物和n的拟轮烷配合物制备超分子四臂星形共聚物甲基丙烯酸丁酯（BMA）是通过硝基氧化物介导的聚合反应。用二恶烷/ THF / MeOH进行溶剂分馏除去了少量的高分子量聚（BMA）均聚物。从其单峰尺寸排阻色谱图可知，分子量的增加直接证明了四臂星形共聚物的形成。没有残留的起始聚苯乙烯。NMR光谱显示了共聚物的两种成分，并证实了[2]轮烷中心单元的存在。差示扫描量热法显示两个玻璃化转变温度，这与聚苯乙烯和聚（BMA）的温度非常接近。
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