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- W2317367263 abstract "N-substituted glycine N-thiocarboxyanhydrides (NTAs) are alternative monomers to prepare polypeptoids with large-scale producing potential compared to the corresponding N-carboxyanhydrides (NCAs) due to their easily synthetic approach and stability during purification and storage. Novel monomer N-butylglycine NTA (NBG-NTA) has been synthesized and well characterized for the first time. Rare earth borohydrides [RE(BH4)3(THF)3, RE = Sc, Y, La, Nd, Dy, and Lu] have been first applied in the polymerization of sarcosine NTA (Sar-NTA) and NBG-NTA to achieve high molecular weight (MW) hydrophilic and hydrophobic polypeptoids. Polysarcosines (PSars), poly(N-butylglycine)s (PNBGs), and their copolymers with high yields, high MWs, and moderate MW distributions are synthesized at 60 °C by using RE(BH4)3(THF)3 initiators. MWs of polypeptoids are controlled by feed molar ratios. For instance, PSar with an absolute Mn of 27.7 kDa (DP = 390) and PDI of 1.14 is produced successfully from Sar-NTA. Thermoresponsive random copolypeptoids poly(sarcosine-r-N-butylglycine)s [P(Sar-r-NBG)s] have reversible phase transitions (cloud point temperature) in aqueous solution and minimal cytotoxicity comparable to PEG and PSar, which is promising in various biomedical and biotechnological applications. Thermal properties of homo- and co-polypeptoids are investigated by TGA and DSC measurements." @default.
- W2317367263 created "2016-06-24" @default.
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- W2317367263 date "2014-09-10" @default.
- W2317367263 modified "2023-10-13" @default.
- W2317367263 title "Controlled Polymerization of N-Substituted Glycine <i>N</i>-Thiocarboxyanhydrides Initiated by Rare Earth Borohydrides toward Hydrophilic and Hydrophobic Polypeptoids" @default.
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- W2317367263 doi "https://doi.org/10.1021/ma501131t" @default.
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