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- Title
Preparation and Thermoresponsive Properties of UCST-Type Polypeptide Bearing p-Tolyl Pendants and 3-Methyl-1,2,3-triazolium Linkages in Methanol or Ethanol/Water Solvent Mixtures.
- Authors
Li, Minjie; Xu, Yanzhi; Liu, Tingting; Li, Yin; Ling, Ying; Tang, Haoyu
- Abstract
A series of ionic polypeptides bearing p-tolyl pendants and 3-methyl-1,2,3-triazolium linkages is synthesized by N-alkylation and subsequent ion-exchange reaction. 1H NMR and Fourier transform infrared (FTIR) analysis verify their molecular structures and reveal quantitative conversions. The nonionic polypeptides bearing p-tolyl pendants and 1,2,3-triazole linkages show no thermoresponsiveness in various solvents. The resulting ionic polypeptides (i.e., P2) are able to show reversible upper critical solution temperature (UCST)-type phase behaviors both in methanol and ethanol/water binary solvent mixtures by incorporation with proper counteranions (i.e., iodide). FTIR analysis reveals that P2 may have interacted with solvent molecules via the van der Waals interaction, H-bonding, and dipolar-dipolar interactions. Variable-temperature UV-vis spectroscopy reveals that the UCST-type phase transition temperatures ( Tpts) of P2 are in the range of about 26-37 °C in MeOH and in the range of about 11-46 °C in EtOH/H2O solvent mixtures depending on the main-chain length, polymer concentration, and the weight percentage of ethanol ( fw).
- Subjects
POLYPEPTIDES; FOURIER transform infrared spectroscopy; VAN der Waals forces; METHANOL; ETHANOL; SOLVENTS
- Publication
Macromolecular Chemistry & Physics, 2017, Vol 218, Issue 10, pn/a
- ISSN
1022-1352
- Publication type
Article
- DOI
10.1002/macp.201700006