新型温敏改性丙烯酰胺共聚物的性能研究

以2,2,3,4,4,4-六氟甲基丙烯酸酯(AF6)和丙烯酸辛烷基酚聚氧乙烯酯(OPA7)为共聚单体改性聚丙烯酰胺(PAM),得到P(AM-AF6)、P(AM-OPA7)和P(AM-OPA7-AF6)三种共聚物,其中P(AM-OPA7-AF6)溶液表现良好的热增稠性。采用可见分光光度计、动态光散射(DLS)和荧光分光光度计研究了三种共聚物分子在溶液中的相互作用。结果表明:P(AM-AF6)和P(AM-OPA7)溶液在30～85℃未产生疏水缔合,高温增稠现象不明显。对于P(AM-OPA7-AF6)聚合物,单体AF6与OPA7中的氟碳链与聚乙烯醚链在升温过程中的协同作用极大地影响了聚合物分子的自组装行为,诱发了溶液-凝胶转变行为,明显提高了其盐溶液表观黏度。

Property Study on Novel Thermo-sensitive Polyacrylamide Derivatives

2,2,3,4,4,4-hexafluorbutyl methacrylate(AF6)and(20-(4-octylphenoxy)-3,6,9,12,15,18-hexaoxaicosyl acrylate)(OPA7)were adopted to modify polyacrylamide(PAM),three copolymers were obtained,named P(AM-AF6),P(AM-OPA7)and(P(AM-OPA7-AF6),respectively.The P(AM-OPA7-AF6)solution exhibited significant thermo-thickening behavior at high temperatures.The reaction of three copolymers was studied by visible spectrometry,dynamic light scattering and fluorescence measurement.It was revealed that no inter-molecular association occurred for P(AM-AF6)and P(AM-OPA7)in the solution at 30～85 ℃.The significant thermo-thickening behavior of P(AM-OPA7-AF6)solutions was due to the phase-separation of copolymer solutions,which was induced by mixed aggregation micro-domains containing dehydrated PEO side-chains and fluorine-containing side-chains as temperature increased.The apparent viscosity of the salt solution was enhanced significantly.