文献类型：期刊文献

英文题名：Spiral- and meridian-patterned spheres self-assembled from block copolymer/homopolymer binary systems

作者：Xu, Wenheng[1];Xu, Zhanwen[1];Cai, Chunhua[1];Lin, Jiaping[1];Gao, Liang[1];Qi, Huimin[1];Lin, Shaoliang[1]

机构：[1]East China Univ Sci & Technol, Frontiers Sci Ctr Materiobiol & Dynam Chem, Sch Mat Sci & Engn, Shanghai Key Lab Adv Polymer Mat,Key Lab Ultrafin, Shanghai 200237, Peoples R China

年份：2021

卷号：13

期号：33

起止页码：14016

外文期刊名：NANOSCALE

收录：;EI(收录号：20213510847598);WOS:【SCI-EXPANDED(收录号:WOS:000686748000001)】；

基金：This work was supported by the National Natural Science Foundation of China (52073095, 51621002, 51833003, and 51573049) and the project of Shanghai Municipality (20ZR1471300). Support of the Shanghai Synchrotron Radiation Facility, Beamline BL16B1 (2019-SSRF-PT-011602) for WAXS testing is also appreciated.

语种：英文

外文关键词：Self assembly - Spheres - Systems (metallurgical) - Homopolymerization - Nanostructures

摘要：Spiral nanostructures, mainly in the 2D form, have been observed in polymer self-assembly, while well-defined 3D spirals are rarely reported. Here we report that a binary system containing polypeptide-based block copolymers and homopolymers can self-assemble into well-defined spiral spheres (3D spirals), in which the homopolymers form the core and the copolymers form the spirals. Upon increasing the preparation temperature, meridian spheres were obtained. Mixing polypeptide block copolymers with opposite backbone chirality also leads to the formation of meridian spheres. In the meridian patterns, a tighter packing manner of the phenyl groups appended to the polypeptide blocks was observed, which is responsible for the spiral-to-meridian transitions. This work enriches the research of spiral assemblies and provides a facile route to switch chiral/achiral nanostructures by regulating the packing manner of the pendant groups.