P(DEAM-co-MAA)在稀水溶液中构象行为的荧光探针研究

利用UV透光率测定,荧光探针技术等研究了N,N-二乙基丙烯酰胺(DEAM)与甲基丙烯酸(MAA)的共聚物P(DEAM-co-MAA) 在稀水溶液中的构象行为.结果表明，当共聚物中DEAM含量小于8.00％(molar fraction),溶液的pH < 6时,P(DEAM-co-MAA)在稀水溶液中的构象行为与聚甲基丙烯酸(PMAA)相似,共聚物可形成疏水微区,表现为一种较为高度压缩的线团构象;当共聚物中DEAM含量大于8.00％(molar fraction)时,由于高分子的稀释效应,P(DEAM-co-MAA)在pH 2～10范围内表现为较为松散的伸展构象.P(DEAM-co-MAA)构象随其组成和pH变化的这种性质有可能在新型敏感性凝胶的合成设计上获得应用.

Fluorescence Probe Studies on the Conformation Behavior of P(DEAM-co-MAA) in Dilute Aqueous Solution

The conformation behavior of N,N diethylacrylamide (DEAM) and methacrylic acid (MAA) copolymer P(DEAM co MAA) was investigated by fluorescence probe technique and UV transmittance measurements.The results demonstrated that the conformation behavior of P(DEAM co MAA) in dilute aqueous solution is similar to that of PMAA,showing hypercoiled conformation and forming hydrophobic microdomain when the molar fraction of DEAM in P(DEAM co MAA) is less than 8.00% and the solution pH is less than 6;but the conformation of P(DEAM co MAA) in dilute aqueous solution shows a loose extended form due to polymer dilution effect in all of pH range when the molar fraction of DEAM in P(DEAM co MAA) is higher than 8.00% .The effect of DEAM contents and pH on the conformation of P(DEAM co MAA) may find some uses in the design and synthesis of novel sensitive gels.