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首页> 美国卫生研究院文献>Polymers >The Micellization of Well-Defined Single Graft Copolymers in Block Copolymer/Homopolymer Blends
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The Micellization of Well-Defined Single Graft Copolymers in Block Copolymer/Homopolymer Blends

机译：嵌段共聚物/均聚物共混物中明确定义的单个接枝共聚物的胶束化

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A series of well-defined (polyisoprene)2(polystyrene), I2S, single graft copolymers with similar total molecular weights but different compositions, fPS, were blended with a low molecular weight polyisoprene homopolymer matrix at a constant concentration 2 wt%, and the micellar characteristics were studied by small-angle x-ray scattering. To investigate the effect of macromolecular architecture on the formation and characteristics of micelles, the results on the single graft copolymers were compared with those of the corresponding linear polystyrene-b-polyisoprene diblock copolymers, SI. The comparison reveals that the polystyrene core chains are more stretched in the case of graft copolymer micelles. Stretching turned out to be purely a result of the architecture due to the second polyisoprene block in the corona. The micellization of a (polystyrene)2(polyisoprene), S2I, graft copolymer was also studied, and the comparison with the results of the corresponding I2S and SI copolymers emphasizes the need for a critical core volume rather than a critical length of the core-forming block, in order to have stable micelles. Finally, the absence of micellization in the case of the I2S copolymer with the highest polystyrene volume fraction is discussed. For this sample, macrophase separation occurs, with polyisoprene cylinders formed in the copolymer-rich domains of the phase-separated blends.
机译：一系列明确定义的（聚异戊二烯）2（聚苯乙烯），I2S，具有相似的总分子量的单个接枝共聚物，但不同的组合物FPS，与低分子量聚异戊二烯均聚物基质以恒定的浓度2wt％共混，通过小角度X射线散射研究了胶束特性。为了研究大分子结构对胶束形成和特征的影响，将单个接枝共聚物的结果与相应的线性聚苯乙烯-B-聚异戊二烯二嵌段共聚物，Si进行比较。比较表明，在接枝共聚物胶束的情况下，聚苯乙烯芯链更加拉伸。由于电晕中的第二多异戊二烯块，伸展纯粹是架构的结果。研究了（聚苯乙烯）2（聚异戊二烯），S2I，接枝共聚物的胶束化，并且与相应的I2S和Si共聚物的结果的比较强调需要临界核心体积而不是核心的临界长度 - 形成块，以具有稳定的胶束。最后，讨论了在具有最高聚苯乙烯体积分数的I2S共聚物的情况下没有胶束化。对于该样品，发生巨噬细胞分离，其中聚异戊二烯圆筒形成在相分离的共混物的共聚物的富座中。

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