Si Xiaowen, Jiang Chenxi, Hu Yu, Mu Jingshan
Department of Polymer Science and Engineering, Faculty of Materials Science and Chemical Engineering, Ningbo University, Ningbo 315211, P. R. China.
Soft Matter. 2024 Sep 18;20(36):7258-7269. doi: 10.1039/d4sm00845f.
This paper presents a systematic investigation of the crystalline nucleation, micellization, two-dimensional (2D) growth of polyethylene--hyperbranched polyglycidol (PE-PG) copolymers in solutions during cooling and isothermal crystallization. As a result, lozenge-shaped monolayer or multilayer lamellar crystals were prepared by optimizing the "self-nucleation" conditions. The effect of crystallization temperatures (), critical micelle temperature (CMT), selective solvents, and the topology of block copolymers (BCPs) on the growth of 2D lozenge-shaped crystals is extensively explored using TEM, AFM and DLS techniques. The results demonstrate that the formation of a perfect lozenge-shaped monolayer crystal is contingent upon the relationship between CMT and of the BCPs (CMT < ), as well as the isothermal crystallization temperature (CMT < < ). This significant finding provides a feasibility programme for the preparation of 2D lamellar crystals using the "self-nucleation" approach from an alternative viewpoint of the corona topology.
本文对聚乙烯-超支化聚缩水甘油（PE-PG）共聚物在溶液冷却和等温结晶过程中的结晶成核、胶束化以及二维（2D）生长进行了系统研究。结果表明，通过优化“自成核”条件制备出了菱形单层或多层片晶。利用透射电子显微镜（TEM）、原子力显微镜（AFM）和动态光散射（DLS）技术，广泛探究了结晶温度（）、临界胶束温度（CMT）、选择性溶剂以及嵌段共聚物（BCP）拓扑结构对二维菱形晶体生长的影响。结果表明，完美菱形单层晶体的形成取决于BCP的CMT与（CMT < ）之间的关系，以及等温结晶温度（CMT < < ）。这一重要发现从冠层拓扑结构的另一个角度为采用“自成核”方法制备二维片晶提供了一个可行性方案。
