摘要
研究了溶剂法合成聚阴离子纤维素（ＰＡＣ）过程中游离碱浓度、氯乙酸钠水解率和产品取代度及其溶液粘度与反应条件的关系。选用低极性异丙醇／水（体积比９／１）溶剂，能有效地抑制氯乙酸钠的水解从而获得较高的产品取代度和氯乙酸利用率。合成过程中加入表面活性剂有利于提高反应的均匀性，使产品抗盐性增强。
The dependence of concentration of free sodium hydroxide,hydrolyzation ratio of sodium chloroacetate,degree of substitution(DS)and solution viscosity of product on reaction conditions in the synthesis of polyanionic cellulose (PAC)in various alcohol mediums are studied.By using CH_3CHOHCH_3/H_2O(V/V=9/1)medium with lower polarity,the hydrolyzation ratio of sodium chloroacetate is effectively inhibited so that higher DS of PAC and higher utilization ratio of ClCH_2COOH are obtained.The addition of surfactant into the medium in synthesis improves the homogeneity of reaction and thus enhances the salt tolerancy of PAC.
关键词
聚阴离子纤维素
PAC
合成
工艺
Polyanionic cellulose
Synthesis technology
Alcohol medium
