Intramolecular Cyclization-Induced Crystallization-Driven Self-Assembly of an Amorphous Poly(amic acid),Macromolecules

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Intramolecular Cyclization-Induced Crystallization-Driven Self-Assembly of an Amorphous Poly(amic acid)
Macromolecules ( IF 5.1 ) Pub Date : 2020-12-02 , DOI: 10.1021/acs.macromol.0c02186
Hui Sun _{1,

2,

3} , Jianzhong Du _{1,

2}

Affiliation

We propose a new concept of intramolecular cyclization-induced crystallization-driven self-assembly (ICI-CDSA) based on an amorphous poly(amic acid) (PAA). Nanobundles with high crystallinity were prepared via CDSA that was thermally induced by the imidization reaction of PAA as the crystallizable polyimide segments were introduced into its backbone. With the increase of the initial concentration of PAA, higher-order flower-shaped structures with high crystallinity and concentration-dependent petal numbers were obtained as a result of the hierarchical self-assembly of these nanobundles. The relationship between the degree of imidization and the crystallization behavior of polymers was explored. The critical degree of imidization of the polymer was 92% to form crystallized nanobundles and flower-shaped structures, below which only amorphous assemblies were obtained. In addition, nanofibers were prepared by ICI-CDSA of PAA. Overall, a new approach named ICI-CDSA was reported to self-assemble amorphous polymers into crystallized nanostructures.

中文翻译：

非晶态聚酰胺酸的分子内环化诱导结晶驱动自组装

我们提出了一种基于无定形聚（酰胺酸）（PAA）的分子内环化诱导结晶驱动自组装（ICI-CDSA）的新概念。通过将可结晶的聚酰亚胺链段引入其骨架中，通过PAA的酰亚胺化反应热诱导的CDSA制备具有高结晶度的纳米束。随着PAA初始浓度的增加，由于这些纳米束的分层自组装，获得了具有高结晶度和浓度依赖性花瓣数的高阶花状结构。探索了酰亚胺化程度与聚合物结晶行为之间的关系。聚合物的酰亚胺化临界程度为92％，形成结晶的纳米束和花形结构，在此之下，仅获得非晶态的组件。另外，通过PAA的ICI-CDSA制备了纳米纤维。总体而言，据报道，一种名为ICI-CDSA的新方法可以将无定形聚合物自组装成结晶的纳米结构。

更新日期：2020-12-22

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