中华医学超声杂志

应用化学 ›› 2010, Vol. 27 ›› Issue (04): 380-383.DOI: 10.3724/SP.J.1095.2010.90360

• 研究论文 • 上一篇    下一篇

小角X射线散射研究乳胶分散液的微观结构

姜志勇1,2,胡珊珊1,2,门永锋1*   

  1. (1.中国科学院长春应用化学研究所，高分子物理与化学国家重点实验室 长春 130022;
    2.中国科学院研究生院 北京)
  • 收稿日期:2009-05-21 修回日期:2009-06-24 出版日期:2010-04-10 发布日期:2010-04-10
  • 通讯作者: 门永锋，男，研究员，博士生导师; E-mail:men@ciac.jl.cn; 研究方向：高分子物理

Microstructure of Latex Dispersion by Small-Angle X-ray Scattering

姜志勇1,2,胡珊珊1,2,门永锋1*   

  1. (1.State Key Laboratory of Polymer Physics and Chemistry,Changchun Institute of
    Applied Chemistry,Chinese Academy of Sciences,Changchun 130022;
    2.Graduate School of Chinese Academy of Sciences,Beijing)
  • Received:2009-05-21 Revised:2009-06-24 Published:2010-04-10 Online:2010-04-10

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摘要：

采用同步辐射小角X射线散射（SAXS）技术观察了2种不同乳胶体系的微观结构以及将其混合对结晶行为的影响。 结果表明，体积分数为50%的苯乙烯-丙烯酸丁酯共聚物乳胶液在室温下没有结晶。 通过对散射强度曲线的拟合，乳胶粒子的平均半径是76 nm,小于动态光散射的测量值（80 nm）。 然而，50%的苯乙烯-丁二烯共聚物乳胶液发生了结晶。 利用面心立方（fcc）结构和晶格常数为212 nm的晶格衍射进行拟合，发现散射曲线中的所有Bragg衍射峰均对应1个或多个晶面指数。 将2种乳胶液混合后各个衍射峰仍能分辨出来，这说明原始乳液中的部分微晶在混合过程中仍然稳定存在。

关键词: SAXS, 乳胶, 微观结构

Abstract:

The microstructures of two samples of latex dispersion system and the influence of their blending on the crystallization behavior were investigated by means of synchrotron small-angle X-ray scattering(SAXS) technique. The experimental results confirmed that the latex dispersion at a volume fraction of 50% composed of styrene-butylacrylate copolymer did not show up crystalline structures at room temperature. By virtue of fitting the scattering intensity distribution curve, the average radius of the latex particle was 76 nm, which is smaller than the value determined by dynamic light scattering(80 nm). However, the crystalline structure can be probed in the latex dispersion of styrene-butadiene copolymer with a solid content of 50%. Each Bragg peak in the scattering profile can be assigned to one or several crystal indices by assuming diffraction from a face-centered-cubic crystalline structure with a lattice constant of 212 nm. The diffraction peaks can be detected after mixing the two latex dispersion samples, implying that the partial crystallites in the original latex solution are still stable in the blending process.

Key words: SAXS, Latex Dispersion, Microstructure

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