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OALib Journal期刊
ISSN: 2333-9721
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聚甲基丙烯酸基纳米水凝胶的“绿色”合成
DOI: 10.11777/j.issn1000-3304.2015.14413, PP. 713-719
Keywords: 聚甲基丙烯酸,pH,响应性,纳米水凝胶,正负电荷作用,合成
Abstract:
利用原位生成的聚甲基丙烯酸甲酯种子乳胶模板以及表面活性剂与功能单体间的正负电荷作用,发展了一种可在全水相中"绿色"合成聚甲基丙烯酸(PMAA)基纳米水凝胶的新方法.利用动态光散射法、ζ-电位测定、FTIR和TEM对纳米水凝胶的尺寸及其分布、表面电荷、组成、形态、结构和pH响应行为进行了表征.结果表明,PMAA基纳米水凝胶具有聚甲基丙烯酸甲酯内核和交联聚甲基丙烯酸外壳的核壳结构.当甲基丙烯酸(MAA)的用量由2mL增至3mL时,PMAA基纳米水凝胶的尺寸变大.当MAA的用量增加至5mL时,反应体系中除了生成PMAA基纳米水凝胶外,还生成了PMAA次级粒子.PMAA基纳米水凝胶表现出良好的pH响应性当介质的pH值由2增加至7时,其流体力学体积扩张了近80倍.
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