Quantify the contribution of chain length heterogeneity on block copolymer self-assembly
Quantify the contribution of chain length heterogeneity on block copolymer self-assembly
复制标题
量化链长异质性对嵌段共聚物自组装的贡献
DOI：
10.1016/j.giant.2020.100037
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发表时间：
2020
期刊：
影响因子：
7
通讯作者：
Dong X.-H.
中科院分区：
文献类型：
--
作者：
Sun Y.;Tan R.;Ma Z.;Zhou D.;Li J.;Kong D.;Dong X.-H.
本文定量探讨了链长非均质性对嵌段共聚物自组装行为的影响，重点关注了窄分布区域。采用模块化方法制备了由低聚二甲基硅氧烷（oDMS）和低聚乳酸（oLA）嵌段组成的离散二嵌段共聚物库，并在室温下形成了高度有序的纳米结构。然后通过重构方法精确调节ola块的分子量分布，实现对链长非均质性的绝对控制。通过精心调整分布轮廓的宽度和对称性，组装的纳米结构的晶格尺寸显着扩大，而相稳定性没有明显的变化。这项工作为具有窄分散性的嵌段共聚物提供了明确的途径，这是传统化学方法无法实现的，揭示了分散性对自组装的关键贡献，并弥合了实验与理论之间的现有差距。
This work quantitatively explores the effect of chain length heterogeneity on self-assembly behaviors of block copolymer, focusing on the narrow distribution region. A library of discrete diblock copolymers consisting of oligo dimethylsiloxane (oDMS) and oligo lactic acid (oLA) blocks were modularly prepared withone monomerdifference in composition, which form highly ordered nanostructures at room temperature. The molecular weight distribution of theoLA block was then precisely modulated through a reconstruction approach, achieving an absolute control on chain length heterogeneity. By meticulously tuning the breadth and symmetry of the distribution profile, the lattice dimension of the assembled nanostructure significantly expands, while no appreciable difference on the phase stability was observed. This work provides an explicit access to block copolymers with narrow dispersity that are not possible through conventional chemical approach, revealing the critical contribution of dispersity on self-assembly and bridging the existing gaps between experiments and theories.