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化学学报
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化学学报 ›› 2007, Vol. 65 ›› Issue (19): 2163-2168. 上一篇    下一篇

研究论文

P(AA-g-NIPAM)与PNIPAM间络合作用的荧光技术研究

刘侠, 刘守信*, 李芳, 房喻, 王忆娟, 余娟   

  1. (应用表面与胶体化学教育部重点实验室 陕西师范大学化学与材料科学学院 西安 710062)
  • 投稿日期:2007-01-10 修回日期:2007-04-05 发布日期:2007-10-14
  • 通讯作者: 刘守信

Complexation between P(AA-g-NIPAM) and PNIPAM Studied by Fluorescence Techniques

LIU Xia; LIU Shou-Xin*; LI Fang; FANG Yu; WANG Yi-Juan; YU Juan   

  1. (Key Laboratory of Applied Surface and Colloid Chemistry, Ministry of Education, School of Chemistry and Materials Science, Shaanxi Normal University, Xi'an 710062)
  • Received:2007-01-10 Revised:2007-04-05 Published:2007-10-14
  • Contact: LIU Shou-Xin

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利用UV透光率、荧光探针和荧光各向异性研究了稀水溶液中聚N-异丙基丙烯酰胺(PNIPAM)与接枝共聚物聚丙烯酸接枝聚N-异丙基丙烯酰胺[P(AA-g-NIPAM)]间的络合作用. 结果表明, PNIPAM和P(AA-g-NIPAM)之间通过氢键作用形成络合物. 络合作用依赖于溶液pH及P(AA-g-NIPAM)接枝共聚物中AA的相对含量. 溶液pH越小, AA相对含量越高, 络合作用越强. 这种络合作用使得聚合物主链变得较为收缩, 体系亲水性降低, 表现出一定的疏水性.

关键词: 络合作用, P(AA-g-NIPAM), PNIPAM, 荧光各向异性

The complexation between poly(acrylic acid-g-N-isopropylacrylamide) [P(AA-g-NIPAM)] and poly(N-isopropylacrylamide) (PNIPAM) in an aqueous solution was studied by UV transmittance measurements, fluorescence probe and fluorescence anisotropy techniques. It was found that the complex was formed between the two polymers through hydrogen bonding interactions. Moreover, the complexation showed the dependence on pH values and the AA contents in the graft copolymers. The complexation became stronger with increasing AA contents in the graft copolymers and decreasing the solution pH value. This interaction made the polymer backbones shrink, meanwhile, the complex system exhibited hydrophobic properties, and its hydrophilic character was weakened.

Key words: complexation, P(AA-g-NIPAM), PNIPAM, fluorescence anisotropy