高等学校化学学报

高等学校化学学报 ›› 2000, Vol. 21 ›› Issue (6): 976.

• 论文 • 上一篇    下一篇

芘标记磺酸基聚电解质在水与DMSO中的荧光光谱

高峰, 严宇, 任碧野, 童真   

  1. 华南理工大学材料科学研究所, 广州 510640
  • 收稿日期:1999-07-07 出版日期:2000-06-24 发布日期:2000-06-24
  • 通讯作者: 童　真(1956年出生),男,博士,教授,博士生导师.主要从事高分子物理、高分子材料研究.
  • 基金资助:

    国家自然科学基金(批准号:29804003);国家杰出青年科学基金(29725411)

Fluorescence Spectra of Pyrene Labeled Polyelectrolytes with Sulfonate Groups in Water and DMSO

GAO Feng, YAN Yu, REN Bi-Ye, TONG Zhen   

  1. Research Institute of Materials Science, South China University of Technology, Guangzhou 510640, China
  • Received:1999-07-07 Online:2000-06-24 Published:2000-06-24

PDF (PC)

被引次数

13

摘要： 合成了芘标记单体N-(芘基)甲基-2-甲基丙烯酰胺(PyMA),其与2-丙烯酰胺基-2-甲基丙磺酸(AMPS)、N,N-二甲基丙烯酰胺(DMAA)共聚,得到含PyMA摩尔分数为0.1%、AMPS摩尔分数FAMPS分别为0.033～0.896的芘标记磺酸基聚电解质.在DMSO和水中,FAMPS<0.449时芘标记聚电解质的荧光光谱与PyMA的荧光光谱基本相同;当FAMPS≥0.449时,芘的[0,1]和[0,3]跃迁的发射强度大幅度增强.芘标记的I1/I3值随聚电解质电荷密度增加逐渐减小,且随聚电解质浓度增加也减小,表明聚电解质体系中通过电离基团间吸引形成了分子主链的聚集.

关键词: 聚电解质, 荧光光谱, 芘, 微极性

Abstract: Pyrenylmethyl methacrylamide(PyMA) was synthesized, and applied to copolymerizing with AMPSand DMAAto get a series of pyrene labeled polymers with sulfonate groups. The molar fraction of sulfonate monomer AMPSin these samples varies from 0.0326 to 0.896 . In DMSOand water, the profile of fluorescence spectrum of pyrene labeled polyelectrolytes is analogous to that of PyMAwhen FAMPS < 0.449, while the [0,1] emission peak abruptly increased as FAMPS ≥0.449. The so called polarity scale of pyrene, I1/ I3 of pyrene labeled polyelectrolytes in DMSOand in water decreases gradually with increasing FAMPSrepresenting the charge density of the samples. I1/ I3 also decreases gradually with the increase in polymer concentration in water. The results imply that there exists the hydrophobic aggregation through locally electrostatic attraction even in polyelectrolyte/polar solvent system, in contrast to the traditional polyelectrolyte theory. However, I1/ I3 of these polyelectrolytes remains almost a constant with increasing NaCl concentration of aqueous solution up to 0.75 mol/L, indicating the electrostatic attraction cannot be simply screened.

Key words: Polyelectrolyte, Fluorescence spectrum, Pyrene, Micropolarity

中图分类号: 

TrendMD: