• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Applied Polymer Science >Sorption and desorption of tetrachloroethylene in fluoropolymers: Effects of the chemical structure and crystallinity
【24h】

Sorption and desorption of tetrachloroethylene in fluoropolymers: Effects of the chemical structure and crystallinity

机译：四氯乙烯在含氟聚合物中的吸附和解吸：化学结构和结晶度的影响

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

In 18 fluoropolymers with different repeating-unit structures and crystallinities, the solubility, diffusivity, and permeability at 70degreesC of a polarizable nonpolar solute (tetrachloroethylene) were studied. The transport properties were mostly controlled by the polarity of the polymer and to a lesser degree by the polymer crystallinity. The highest permeability was observed in the dipole-containing ethylene-chlorotrifluoroethylenes because of their high tetra chloroethylene solubility. The lowest permeability was observed in the hydrogen-bonding poly(vinylidene fluoride) polymers because of the combination of low solute solubility and solute diffusivity. The tetrachloroethylene diffusivity was solute-concentration-dependent, and sorption curves were S-shaped, indicating that the solute surface concentration was time-dependent. The rate at which the surface concentration approached the saturation level was proportional to the product of Young's modulus, the square of the thickness of the dry polymer, and the logarithm of the solute diffusivity. Data for the water-hyperbranched polymer and limonene-polyethylene conformed to the same relationship. Therefore, this provides a new tool for predicting the solute-surface-concentration time dependence from data obtained by independent measurements. (C) 2002 Wiley Periodicals, Inc. [References: 24]
机译：在具有不同重复单元结构和结晶度的18种含氟聚合物中，研究了可极化的非极性溶质（四氯乙烯）在70℃下的溶解度，扩散系数和磁导率。传输性能主要由聚合物的极性控制，而较小程度则由聚合物的结晶度控制。在含偶极的乙烯-三氟氯乙烯中观察到最高的渗透性，因为它们具有很高的四氯乙烯溶解度。由于低溶质溶解度和溶质扩散性的结合，在氢键合聚偏二氟乙烯聚合物中观察到了最低的渗透性。四氯乙烯的扩散率与溶质浓度有关，吸附曲线呈S形，表明溶质表面浓度与时间有关。表面浓度接近饱和水平的速率与杨氏模量，干燥聚合物厚度的平方和溶质扩散率的对数的乘积成比例。水超支化聚合物和柠檬烯-聚乙烯的数据符合相同的关系。因此，这提供了一种新工具，用于根据通过独立测量获得的数据来预测溶质表面浓度的时间依赖性。 （C）2002 Wiley Periodicals，Inc. [参考：24]

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号