Add time:09/24/2019         Source:sciencedirect.com

Poly(l-cysteine) bearing imidazolium salts, namely poly(S-(2-(3-(N-butylimidazolium tetrafluoroborate)propoxycarbonyl)ethyl)-l-cysteine) (P(ImBF4)LC) was synthesized by ring-opening polymerization of S-(2-(3-chloropropoxycarbonyl)ethyl)-l-cysteine based N-carboxyanhydride (CPLC-NCA), nucleophilic substitution of poly(S-(2-(3-chloropropoxycarbonyl)ethyl)-l-cysteine) (PCPLC), and subsequent ion-exchange reaction. FTIR and CD analysis revealed the presence of β-sheet conformation of P(ImBF4)LC in the solid-state and aqueous solution, respectively. P(ImBF4)LC with short degree of polymerization (DP = 10) were able to show a distinct upper critical solution temperature (UCST)-type phase behavior at a low critical concentration (1.6 mg mL−1) in water. Variable-temperature UV–vis spectroscopy results revealed that the UCST-type solution phase transition temperature (Tpt) of P(ImBF4)LC in aqueous solutions increased with increasing of polymer concentration or NaBF4 concentration, whereas it decreased by addition of NaI or NaCl.

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