Citation: Qiu-lin Yuan, Wen-jun Liu, Yong Deng, Ying Ling, Hao-yu Tang. Synthesis, Characterization and Phase Behaviors of Polypeptides Bearing Biphenyl Mesogens and Oligo-Ethylene-Glycol Tails[J]. Chinese Journal of Polymer Science, ;2015, 33(8): 1150-1161. doi: 10.1007/s10118-015-1665-4 shu

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

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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, Xiangtan 411105, China

Corresponding author: Hao-yu Tang,
Received Date: 12 December 2014
Revised Date: 3 January 2015

Fund Project: This work was financially supported by the National Natural Science Foundation of China (No. 21204075), Hunan Provincial Natural Science Foundation of China (No. 13JJ6042) and Xiangtan University start-up fund (No. 12QDZ06).

A series of polypeptides 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 -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 (smectic C, SmC) phase transition and the melting transition of crystalline E-phase, while PPLGn-g-BPOEG7 with longer OEG tail length (m = 7) exhibited the melting transitions without the formation of liquid crystalline phase.
- Liquid-crystalline polymers,
- Polypeptides,
- Click chemistry,
- Smectic phases
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