Synthesis,Characterization and Phase Behaviors of Polypeptides Bearing Biphenyl Mesogens and Oligo-Ethylene-Glycol Tails  

作　　者：Qiu-lin Yuan Wen-jun Liu Yong Deng Ying Ling 唐浩宇 

机构地区：[1]Key Laboratory of Polymeric Materials and Application Technology of Hunan Province,Key Laboratory of Advanced Functional Polymer Materials of Colleges and Universities of Hunan Province,College of Chemistry,Xiangtan University

出　　处：《Chinese Journal of Polymer Science》2015年第8期1150-1161,共12页高分子科学（英文版）

基　　金：financially supported by the National Natural Science Foundation of China(No.21204075);Hunan Provincial Natural Science Foundation of China(No.13JJ6042);Xiangtan University start-up fund(No.12QDZ06)

摘　　要：A series ofpolypeptides bearing biphenyl mesogenic side-chains and oligo-ethylene-glycol （OEG） tails （PPLGn-g- BPOEGm, n = 26 and 63, m = 2, 3, and 7） has been synthesized via a 1,3-dipolar cycloaddition with quantitative grafting density. FTIR results revealed that the polypeptides adopted highly stable a-helix in the temperature range of 25-200 ℃. DSC, POM and WAXS analysis revealed that PPLGn-g-BPOEGm （m ≤ 3） samples with short OEG tail length showed two main phase transitions including crystal to liquid crystalline （smectie C, SmC） phase transition and the melting transition of crystalline E-phase, while PPLG,-g-BPOEG7 with longer OEG tail length （m = 7） exhibited the melting transitions without the formation of liquid crystalline phase.A series ofpolypeptides bearing biphenyl mesogenic side-chains and oligo-ethylene-glycol （OEG） tails （PPLGn-g- BPOEGm, n = 26 and 63, m = 2, 3, and 7） has been synthesized via a 1,3-dipolar cycloaddition with quantitative grafting density. FTIR results revealed that the polypeptides adopted highly stable a-helix in the temperature range of 25-200 ℃. DSC, POM and WAXS analysis revealed that PPLGn-g-BPOEGm （m ≤ 3） samples with short OEG tail length showed two main phase transitions including crystal to liquid crystalline （smectie C, SmC） phase transition and the melting transition of crystalline E-phase, while PPLG,-g-BPOEG7 with longer OEG tail length （m = 7） exhibited the melting transitions without the formation of liquid crystalline phase.

关 键 词：Liquid-crystalline polymers POLYPEPTIDES Click chemistry Smectic phases. 

分 类 号：O631[理学—高分子化学]