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• W2056566734 abstract "ABSTRACT A new monomer derivative of N ‐vinyl‐2‐caprolactam (VCL), namely 3‐( tert ‐butoxycarbonylmethyl)‐ N ‐vinyl‐2‐caprolactam (TBMVCL), was synthesized via nucleophilic substitution at the α‐carbon to the lactam carbonyl group. The monomer was copolymerized radically with VCL and the copolymer compositions were controlled through varying the molar feeding percentages of TBMVCL. The resulting copolymers exhibited temperature‐responsive properties in water, with cloud points decreasing from 33 °C to 13 °C when the TBMVCL composition increased from 2.2 mol % to 18.6 mol %. Removal of the tert ‐butyl protecting groups via acid hydrolysis exposed the carboxyl groups, which conferred pH sensitivity to the thermoresponsive properties of the resulting deprotected copolymers. The cloud point was found to increase with the increase of solution pH from 2.0 to 7.4, due to the ionization of the carboxyl groups. The influence of pH was most drastic for the 18.6 mol % copolymer composition. Furthermore, the phase transition temperature of the deprotected copolymers was found to be dependent on the polymer solution concentration, exemplifying classical Flory–Huggins miscibility behavior. Comparison of responsiveness was also made with another type of carboxyl functionalized poly( N ‐vinyl‐2‐caprolactam) copolymer reported in our prior study, to examine the influence of the chemical structure of the carboxyl substitution group. Finally, the deprotected copolymer was demonstrated to be biocompatible using a fibroblast cell culture. © 2013 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2014 , 52 , 112–120" @default.
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• W2056566734 date "2013-10-29" @default.
• W2056566734 modified "2023-10-05" @default.
• W2056566734 title "Synthesis of 3-(<i>tert</i>-Butoxycarbonylmethyl)-<i>N</i>-vinyl-2-caprolactam and Homologous Copolymerization Toward Biocompatible Carboxylated Poly(<i>N</i>-vinyl-2-caprolactam) Responsive to pH and Temperature" @default.
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• W2056566734 doi "https://doi.org/10.1002/pola.26977" @default.
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