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• W4322771731 endingPage "105709" @default.
• W4322771731 startingPage "105709" @default.
• W4322771731 abstract "In-situ 1H NMR was used to obtain the copolymerization reactivity ratios of n-vinylpyrrolidone (VP) and 3-butyl-1-vinylimidazolium bromide (BVIM[Br]) using D2O and V50 as solvent and initiator, respectively. The influence of the VP-BVIM[Br] monomer ratios was studied at 45, 50, and 55 °C using initial molar ratios of (30−70), (50−50), and (70−30), respectively. According to the monomer conversions, it was determined that electrostatic and thermodynamic effects controlled the reactions. As the reaction temperature increased, higher conversions were obtained, and in the VP-BVIM[Br] (70−30) ratio, the conversions were higher and close to 100 % at 50 and 55 °C. This result was attributed to the lower ionic strength in the initial reaction system (0.46 mol/L). The monomer reactivities were calculated using the Mao-Huglin method and it was found that for the (70−30) VP-BVIM[Br] molar ratio at 45, 50, and 55 °C, rVP=rBVIM[Br]=1, obtaining random copolymers. For the VP-BVIM[Br] (30−70) molar ratio at 45 °C, the reactivity of VP was higher than that of BVIM[Br], rVP= 2.1 > rBVIM[Br]= 0.7, and for the VP-BVIM[Br] (50−50) molar ratio at 50 and 55 °C, the reactivity of VP was lower than that of BVIM[Br], rVP= 0.5 < rBVIM[Br]= 1.1 and rVP= 1 < rBVIM[Br]= 1.5, respectively, obtaining a spontaneous gradient copolymer. The decomposition temperature of the copolymers depended on the initial molar ratio of the reaction mixture, finding that the higher the VP molar ratio, the higher the initial decomposition temperature (279 °C). Random copolymers reached higher Tg (174 °C) in comparison with those that featured a spontaneous gradient microstructure (152 °C)." @default.
• W4322771731 created "2023-03-03" @default.
• W4322771731 creator A5019617924 @default.
• W4322771731 creator A5027913952 @default.
• W4322771731 creator A5056054535 @default.
• W4322771731 creator A5083575156 @default.
• W4322771731 creator A5088868149 @default.
• W4322771731 date "2023-06-01" @default.
• W4322771731 modified "2023-10-01" @default.
• W4322771731 title "In-situ 1H NMR measurements of reactivity ratios and thermal properties for copolymerization of N-vinylpyrrolidone and 1-vinyl-3-butylimidazolium bromide" @default.
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