文献类型：期刊文献

英文题名：Superhelices with Designed Helical Structures and Temperature-Stimulated Chirality Transitions

作者：Cai, Chunhua[1];Lin, Jiaping[1];Zhu, Xingyu[1];Gong, Shuting[1];Wang, Xiao-Song[2];Wane, Liquan[1]

机构：[1]E China Univ Sci & Technol, Sch Mat Sci & Engn, Shanghai Key Lab Adv Polymer Mat,Minist Educ, State Key Lab Bioreactor Engn,Key Lab Ultrafine M, Shanghai 200237, Peoples R China;[2]Univ Waterloo, WIN, Dept Chem, Waterloo, ON N2L 3G1, Canada

年份：2016

卷号：49

期号：1

起止页码：15

外文期刊名：MACROMOLECULES

收录：;EI(收录号：20160301829092);WOS:【SCI-EXPANDED(收录号:WOS:000368322000003)】；

基金：This work was supported by the National Natural Science Foundation of China (51303055, 21234002, and 21474029), the National Basic Research Program of China (2012CB933600), and Research Fund for the Doctoral Program of Higher Education of China (20120074120001). Support from Projects of Shanghai municipality (15QA1401400, 15ZZ028, and 13JC1402000) is also appreciated. X.-S.W. thanks the NSERC and the University of Waterloo for financial support.

语种：英文

外文关键词：Dichroism - Dimethylformamide - Organic solvents - Polyethylene glycols

摘要：The synthesis of multicomponent superhelices with determined chirality has been realized. By adding water to polymer solution in organic solvents (tetrahydrofuran/ N,N'-dimethylformamide, THF/DMF), poly(gamma-benzyl L-glutamate)block-poly(ethylene glycol) (PBLG-b-PEG) are able to pack orderly around the surface of PBLG homopolymer bundles with designed helical structures, e.g., right-handed and left-handed, depending on THF/DMF ratio and temperature. A systematic investigation leads to the construction of a temperature organic solvent composition phase diagram. Before the organic solvents were totally removed, the chirality of the assemblies can be reversibly switched using temperature stimulus. This temperature-stimulated chirality transition of polypeptide superhelices is unprecedented. Circular dichroism