选用不同有机溶剂体系为分散介质,通过丙烯酸的沉淀聚合制备了聚丙烯酸（PAA）微凝胶,并用扫描电镜（SEM）、流变仪和紫外分光光度计对其性能进行了测试。结果表明,环己烷是合适的溶剂;PAA微凝胶的pH值在质量分数为0.7%时最低;PAA微凝胶水溶液为假塑性流体,黏度不随温度而变化,且pH为7时,溶液黏度最大,此时,PAA已从微凝胶转变成宏观凝胶;交联程度越高,黏度随pH变化越大。
Polyacrylic acid（PAA） microgels were prepared by precipitation polymerization of acrylic acid in different organic solvent and their properties were analyzed by scanning electron microscope（SEM）,rheometer and UV spectrophotometer.The results show that cyclohexane is the appropriate solvent;the pH value of PAA microgel reaches the minimum when the mass fraction of PAA is 0.7%;PAA microgel solution is a kind of pseudoplastic fluid,its viscosity does not vary with the temperature,and reaches the maximum viscosity with pH value of 7,while the microgel changes into the macro gel;the higher the crosslinking degree,the more greatly the viscosity changes with pH value.
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