Polylactide‐Based Amphiphilic Block Copolymers: Crystallization‐Induced Self‐Assembly and Stereocomplexation,Macromolecular Rapid Communications

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Polylactide‐Based Amphiphilic Block Copolymers: Crystallization‐Induced Self‐Assembly and Stereocomplexation
Macromolecular Rapid Communications ( IF 4.2 ) Pub Date : 2018-10-15 , DOI: 10.1002/marc.201800639
Sebastian Noack ₁ , Dirk Schanzenbach ₁ , Joachim Koetz ₁ , Helmut Schlaad ₁

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The aqueous self‐assembly behavior of a series of poly(ethylene glycol)‐poly(l‐/d‐lactide) block copolymers and corresponding stereocomplexes is examined by differential scanning calorimetry, dynamic light scattering, and transmission electron microscopy. Block copolymers assemble into spherical micelles and worm‐like aggregates at room temperature, whereby the fraction of the latter seemingly increases with decreasing lactide weight fraction or hydrophobicity. The formation of the worm‐like aggregates arises from the crystallization of the polylactide by which the spherical micelles become colloidally unstable and fuse epitaxically with other micelles. The self‐assembly behavior of the stereocomplex aggregates is found to be different from that of the block copolymers, resulting in rather irregular‐shaped clusters of spherical micelles and pearl‐necklace‐like structures.

中文翻译：

聚乳酸基两亲嵌段共聚物：结晶诱导的自组装和立体络合

一系列聚（乙二醇）-聚（l- / d丙交酯）嵌段共聚物和相应的立体配合物通过差示扫描量热法，动态光散射和透射电子显微镜检查。嵌段共聚物在室温下组装成球形胶束和蠕虫状聚集体，其中后者的比例似乎随着丙交酯重量分数或疏水性的降低而增加。蠕虫状聚集体的形成是由聚丙交酯的结晶引起的，球形胶束通过胶态结晶变得胶体不稳定，并与其他胶束外延融合。发现立体复合体聚集体的自组装行为与嵌段共聚物的自组装行为不同，从而导致球形胶束和珍珠项链状结构的簇呈相当不规则的簇状。

更新日期：2018-10-15

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