摘要
采用溶液聚合法合成了一系列N-异丙基丙烯酰胺(NIPAM)与甲基丙烯酸甲酯、丙烯酸乙酯、丙烯酸丁酯或甲基丙烯酸丁酯的无规共聚物,用浊度观测法和光散射法测定了不同共聚物水溶液的温敏相转变行为。结果表明:所得共聚物的低临界溶解温度(LCST)均低于均聚物PNI-PAM的,酯类单体的结构和含量对共聚物的LCST有显著影响,其中酯基上的烷基对共聚物LCST的影响能力大于丙烯酸酯α位上的烷基,前者对增大共聚物的疏水性有更大贡献。通过NIPAM与特定丙烯酸酯单体进行无规共聚可以合成转变温度低于PNIPAM均聚物且具有预设LCST数值的水溶性温敏聚合物。
Random copolymers of N-isopropylacrylamide（NIPAM） with four types of acrylate, namely, methyl methacrylate （MMA）, ethyl acrylate （EA）, butyl acrylate （BA） and butyl methaerylate （BMA）, were prepared respectively through solution free radical polymerization. Thermo-sensitivity of aqueous solutions of the copolymers obtained was investigated by turbidity fest and dynamic light scattering measurement. It is found that the structure and content of acrylic comonomer strongly affect the LCST of the copotymers, i. e. , the larger the carbon number in the ester moiety of the acrylate the lower the LCST, and the alkyl group located at the ester moiety is more effective in lowering the LCST than the alkyl at the α position of the acrylate. Conclusively, water soluble thermo-sensitive copolymer with a lowered and designed LCST can be obtained by random copolymerization of NIPAM with a selected acrylate.
出处
《功能高分子学报》
CAS
CSCD
北大核心
2008年第4期432-436,共5页
Journal of Functional Polymers
