Quantify the contribution of chain length heterogeneity on block copolymer self-assembly

Giant

Jinbin Li¹  Zhuang Ma¹  Xue-Hui Dong¹  Dongdong Zhou¹  Yanxiao Sun¹  Rui Tan¹  Deyu Kong¹ 

[1] South China Advanced Institute for Soft Matter Science and Technology, School of Molecular Science and Engineering, South China University of Technology, Guangzhou 510640, China;

关键词: Dispersity;    Precision macromolecules;    Block copolymer;    Self-assembly;   

DOI  :  

来源: DOAJ

【 摘 要 】

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 with one monomer difference in composition, which form highly ordered nanostructures at room temperature. The molecular weight distribution of the oLA 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.

【 授权许可】

Unknown