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化学学报
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化学学报 ›› 2009, Vol. 67 ›› Issue (15): 1737-1742. 上一篇    下一篇

研究论文

沸石及核壳结构聚合物粒子分散系的介电解析── 粒子排列模式对体积分数的解释

周 威a,b 赵孔双*,a

  

  1. (a北京师范大学化学学院 北京 100875)
    (b北京工商大学化学与环境工程学院 北京 100048)

  • 投稿日期:2008-12-05 修回日期:2009-02-14 发布日期:2009-08-14
  • 通讯作者: 赵孔双

Dielectric Analysis for the NaA Zeolite Particles Stacking Systems and Polystyrene-Polypyrrole Core-Shell Particle Suspensions── Interpretation of Volume Fraction with Statistic Arrangement Pattern of Particles

Zhou, Wei a,b Zhao, Kongshuang *,a   

  1. (a College of Chemistry, Beijing Normal University, Beijing 100875)
    (b College of Chemistry and Environmental Engineering, Beijing Technology and Business University, Beijing 100048)
  • Received:2008-12-05 Revised:2009-02-14 Published:2009-08-14
  • Contact: Zhao, Kongshuang

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在40 Hz～110 MHz频率范围对NaA沸石堆积体系和聚苯乙烯-聚吡咯悬浮液进行了介电测量. 两类体系分别在105和107 Hz表现出因界面极化产生的弛豫. 利用Hanai理论解析两类体系的介电谱, 发现解析体积分数与实测体积分数之间存在与体系的浓度相关的明显差异. 通过分析Wagner原始模型阐明了差异的原因, 指出了分散相粒子相互作用力与差异程度间的内在联系, 从介电角度为胶体分散系中粒子统计排列方式的确定提供了判定依据: 当分散系浓度高于临界值时, 其最可取粒子统计排列模式为六方最密型; 低于临界值后, 排列模式随浓度的降低逐渐向简单立方型转变.

关键词: 介电谱, NaA沸石, 聚苯乙烯-聚吡咯粒子, 体积分数, Wagner理论, 排列模式

NaA zeolite stacking systems and polystyrene-polypyrrole suspensions were measured by dielectric spectroscopy in a frequency range from 40 Hz to 110 MHz. An obvious dielectric relaxation aroused from interfacial polarization was observed, at 105 Hz in the NaA zeolite stacking systems and 107 Hz in polystyrene-polypyrrole suspensions. According to dielectric analysis by Hanai’s theory, the obvious gap between the actual volume fraction and analyzed volume fraction was found. Moreover, the difference degree depended on the actual concentration of the dispersion system. By analyzing the original Wagner’s model, the physical meaning of the analyzed volume fraction was clarified, and interaction among the dispersed particles is responsible to the difference degree between the two volume fractions. As a result, a dielectric analysis way was offered to confirm the statistic arrangement pattern of particles (SAPP) in a colloid dispersion system. When the actual concentration is above the critical value, the optimum SAPP is a hexahedral stacking pattern. With the concentration decreasing, the optimum SAPP transits to the simple cubic stacking pattern.

Key words: dielectric spectroscopy, NaA zeolite, polystyrene-polypyrrole particle, volume fraction