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 , Hao-yu Tang

DOI: 10.1007/S10118-015-1665-4

关键词: Polymer chemistryChemistryBiphenylCrystalMesogenPhase transitionAtmospheric temperature rangeFourier transform infrared spectroscopyPhase (matter)Ethylene glycol

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

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