有机介质中沉淀聚合制备聚丙烯酸微凝胶及其性能  

Preparation and Properties of Polyacrylic Acid Microgel by Precipitation Polymerization in Organic Solvent

作　　者：王飞俊[1] 邵自强[1] 杨萌[1] 王文俊[1] 李永红[1] 

机构地区：[1]北京理工大学材料学院,北京100081

出　　处：《高分子材料科学与工程》2012年第6期151-154,158,共5页Polymer Materials Science & Engineering

摘　　要：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.

关 键 词：聚丙烯酸 微凝胶 分散介质 刺激响应性 流变性 

分 类 号：O636.11[理学—高分子化学]