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- W2104446355 abstract "A series of polypeptides bearing various alkyl (i.e., propyl, hexyl, or octyl) spacers, biphenyl mesogens, and oligo-ethylene-glycol (OEG) tails (i.e., PPLG26-BPOEG m, PHLG34-BPOEGm, and POLG32-BPOEGm [m = 3 or 7]) has been synthesized via 1,3-dipolar cycloaddition reactions with quantitative grafting densities. Fourier transform infrared results reveal that the polypeptides adopted an α-helical conformation in the solid-state. Differential scanning calorimetry (DSC) analysis reveals that the glass transition temperatures (Tgs) of the polypeptides with OEG3 tails decrease with the increasing length of the alkyl spacers. For the samples containing alkyl spacers of the same length, Tg significantly decreases with the increasing lengths of the OEG tails. Polarized optical microscope (POM) results reveal that all polypeptides exhibit strong birefringence at room temperature. Polypeptides with long alkyl spacers (i.e., hexyl or octyl) or OEG7 tails show isotropic transitions, while PPLG26-BPOEG3 show no clear point temperature before thermal decomposition. DSC, POM, and wide-angle X-ray scattering results collectively reveal that polypeptides with long alkyl spacers (i.e., hexyl or octyl) and OEG3 tails undergo a reversible smectic E phase to isotropic phase transition, while polypeptides with OEG7 tails undergo a reversible liquid crystalline phase to isotropic phase transition. The transition temperatures increase with the increasing length of alkyl spacers." @default.
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- W2104446355 date "2015-11-06" @default.
- W2104446355 modified "2023-10-17" @default.
- W2104446355 title "Synthesis and Properties of Side-Chain Liquid Crystalline Polypeptides Bearing Various Alkyl Spacers and Oligo-Ethylene-Glycol Tails" @default.
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- W2104446355 doi "https://doi.org/10.1002/macp.201500260" @default.
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