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• W2068376294 abstract "We synthesized three low-molecular-weight poly(glutamate)s—poly(γ-methyl l-glutamate) (PMLG), poly(γ-ethyl l-glutamate) (PELG), and poly(γ-benzyl l-glutamate) (PBLG)—through living ring-opening polymerization of their α-amino acid-N-carboxyanhydride derivatives and then blended them with phenolic resin to control the secondary structures of these polypeptides. Each of the three binary blends exhibited a single glass transition temperature (differential scanning calorimetry) and a single-exponential decay of proton spin–lattice relaxation times in the rotating frame [T1ρH; solid state nuclear magnetic resonance (NMR) spectroscopy], characteristic of a miscible system. The strength of the interassociative interactions depended on the nature of the hydrogen bond acceptor groups, increasing in the order phenolic/PELG > phenolic/PMLG > phenolic/PBLG, as evidenced through analyses using Fourier transform infrared (FTIR) spectroscopy and the Painter–Coleman association model. The fractions of α-helical conformations (measured using FTIR and solid-state NMR spectroscopy) of PMLG and PELG decreased initially upon increasing the phenolic content but increased thereafter; in contrast, the fraction of α-helical conformations of PBLG increased continuously upon increasing the phenolic contents. Using variable-temperature infrared spectroscopy to investigate the changes in the conformations of the secondary structures of the peptide segments in these three binary blends, we found that the α-helical conformation in these three blend systems correlated strongly with the rigidity of side-chain groups, the strength of the intermolecular hydrogen bonding with the phenolic resin, the compositions of phenolic resin, and the temperature. More interestingly, the content of α-helical conformations of the polypeptides in these phenolic/PBLG blends increased upon increasing the temperature." @default.
• W2068376294 created "2016-06-24" @default.
• W2068376294 creator A5053106100 @default.
• W2068376294 creator A5076216668 @default.
• W2068376294 date "2011-08-18" @default.
• W2068376294 modified "2023-09-23" @default.
• W2068376294 title "Using Hydrogen-Bonding Interactions To Control the Peptide Secondary Structures and Miscibility Behavior of Poly(<scp>l</scp>-glutamate)s with Phenolic Resin" @default.
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• W2068376294 doi "https://doi.org/10.1021/ma200721e" @default.
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