高等学校化学学报

高等学校化学学报 ›› 1994, Vol. 15 ›› Issue (10): 1567.

• 论文 • 上一篇    下一篇

激光光散射表征聚N－异丙基丙烯酰胺的分子量分布

周水琴, 吴奇   

  1. 香港中文大学化学系, 沙田, 新界, 香港
  • 收稿日期:1994-04-30 修回日期:1994-07-04 出版日期:1994-10-24 发布日期:1994-10-24
  • 通讯作者: 吴奇.
  • 作者简介:周水琴,女,28岁,博士研究生.
  • 基金资助:

    香港政府研究资助局基金

Laser Light-Scattering Characterization of the Molecular Weight Distribution of Poly(N-isopropylacrylamide)

ZHOU Shui-Qin, WU Chi   

  1. Department of Chemistry, The Chinese University of Hongkong, Shatin, New Territories, Hognkong
  • Received:1994-04-30 Revised:1994-07-04 Online:1994-10-24 Published:1994-10-24

PDF (PC)

摘要： 采用自由基聚合法合成了聚N-异丙基丙烯酰胺(PNIPAAM)样品,由激光光散射法(LLS),包括绝对累积散射光强的角度依赖性(静态LLS)和线宽分布的角度依赖性(动态LLS)表征了合成的PNIPAAM样品的分子量分布。通过对动态光散射测得的电场-电场时间相关函数的拉普拉斯变换,求得平动扩散系数分布G(D);结合静态和动态光散射测量的结果,即Mw和G(D),确定了PNIPAAM样品的平动扩散系数D对分子量M的标定关系式D=2.84×10-4M-0.55,并将G(D)转换成分子量分布Fw(M).

关键词: 聚N－异丙基丙烯酰胺, 激光光散射法, 分子量分布

Abstract: Poly(N-isopropylacrylamide)(PNIPAAM)was synthesized by free radical polymerization.Laser light scattering(LLS)including the angular dependence of the absolute integrated scatterred intensity(static LLS)and of the line-width distribution(dynamic LLS)has been successfully used to characterize the molecular weight distribution of PNIPAAM sample.By doing the Laplace transform of precisely measured intensity-intensity time correlation function, we can get a translational diffusion coefficient distribution G(D);After combining the static and dynamic LLS results, i.e.Mw and G(D), we were able to convert G(D)into a molecular weight distribution Fw(M).During this conversion, a calibration of D/cm2·s-1=2.84×10-4M-0.55was established.

Key words: Poly(N-isopropylacrylamide), Laser light scattering, Molecular weight distribution

TrendMD: