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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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多重响应性杂臂星型聚合物的RAFT聚合合成及性能研究
DOI: 10.11777/j.issn1000-3304.2015.15038, PP. 1114-1120
Keywords: 杂臂星型聚合物,RAFT,多重响应性,核交联
Abstract:
耦合先臂法("armfirst")和可逆加成-断裂链转移(RAFT)自由基聚合制备以温度响应性聚(聚乙二醇甲醚丙烯酸酯-co-2-(2-乙氧基乙氧基)乙基丙烯酸酯)(POD)和pH响应性聚丙烯酸二甲氨基乙酯(PDMAEA)为臂,含二硫键的N,N'-双丙烯酰胱胺(BAC)为核的杂臂星型聚合物(MAS).采用傅里叶红外光谱(FTIR)、核磁共振氢谱(1H-NMR)和凝胶渗透色谱(GPC)对聚合物的结构、相对分子质量及分子量分布进行了表征.结果表明,该法能有效控制星型聚合物的合成(分子量分布指数PDI<1.3).采用紫外可见吸收光谱法(UV-Vis)、动态光散射(DLS)考察了MAS在水中的相变行为.结果表明,随着臂PDMAEA含量的增加,星型聚合物的LCST增大.当臂POD与PDMAEA的摩尔投料比为55时,聚合物浓度为1mg/mL时其在纯水中的LCST为38.2℃.
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