物理化学学报 >> 2004, Vol. 20 >> Issue (05): 478-482.doi: 10.3866/PKU.WHXB20040507

研究论文 上一篇    下一篇

P(DEAM-co-MAA)在稀水溶液中构象行为的荧光探针研究

刘守信;柳明珠   

  1. 兰州大学化学化工学院,兰州　730000;陕西师范大学化学与材料科学学院,西安　710062
  • 收稿日期:2003-09-15 修回日期:2003-12-16 发布日期:2004-05-15
  • 通讯作者: 柳明珠 E-mail:m-zliu@163.com

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

Liu Shou-Xin;Liu Ming-Zhu   

  1. College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou　730000;School of Chemistry and Materials Science, Shaanxi Normal University, Xi’an　710062
  • Received:2003-09-15 Revised:2003-12-16 Published:2004-05-15
  • Contact: Liu Ming-Zhu E-mail:m-zliu@163.com

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摘要： 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.

关键词: 荧光探针, 透光率, P(DEAM-co-MAA)共聚物, 构象行为, 高分子稀释效应, 疏水缔合

Abstract: 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.

Key words: Fluorescence probe, Transmittance, P(DEAM-co-MAA) copolymer, 　Conformation behavior, Polymer dilute effect, Hydrophobic association