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首页> 外文期刊>Journal of Applied Polymer Science >Acidic and basic hydrolysis of poly(N-vinylformamide)
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Acidic and basic hydrolysis of poly(N-vinylformamide)

机译：聚（N-乙烯基甲酰胺）的酸性和碱性水解

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摘要

Poly(N-vinylformamide) (PNVF) was synthesized and hydrolyzed to poly(vinylamine) (PVAm) in both HCl and NaOH solutions. The hydrolysis kinetics and the equilibrium hydrolysis were examined experimentally at different temperatures, polymer concentrations, and acid- or base-to-amide molar ratios. The hydrolysis kinetics strongly depended on temperature, polymer, and HCl or NaOH concentrations, but showed little dependence on PNVF molecular weight. The acid hydrolysis of PNVF exhibited limited conversions because of the electrostatic repulsion among the cationic amine groups generated during hydrolysis and proton hydrates. In the basic hydrolysis, complete amide conversions were observed when the NaOH/amide molar ratios were greater than unity. The effects of temperature and PNVF concentration on the equilibrium amide conversion appeared to be negligible in both acidic and basic hydrolysis. The equilibrium conversions of base hydrolysis were higher than those of acidic hydrolysis under the same reaction conditions. At NaOH/amide ratios of less than unity, the equilibrium hydrolysis experiments revealed that one base molecule could induce the hydrolysis of more than one amide group. (C) 2002 Wiley Periodicals, Inc. [References: 24]
机译：合成了聚（N-乙烯基甲酰胺）（PNVF），并在HCl和NaOH溶液中将其水解为聚（乙烯基胺）（PVAm）。在不同的温度，聚合物浓度和酸或碱与酰胺的摩尔比下，通过实验检查了水解动力学和平衡水解。水解动力学在很大程度上取决于温度，聚合物以及HCl或NaOH的浓度，但对PNVF分子量的依赖性很小。 PNVF的酸水解显示出有限的转化率，因为在水解过程中产生的阳离子胺基和质子水合物之间存在静电排斥。在碱性水解中，当NaOH /酰胺的摩尔比大于1时，观察到酰胺的完全转化。在酸性和碱性水解中，温度和PNVF浓度对平衡酰胺转化率的影响似乎都可以忽略不计。在相同的反应条件下，碱水解的平衡转化率高于酸性水解的平衡转化率。在NaOH /酰胺比小于1的情况下，平衡水解实验表明一个碱基分子可以诱导一个以上酰胺基团的水解。 （C）2002 Wiley Periodicals，Inc. [参考：24]

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