• 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 >Elastic effects on solubility in semicrystalline polymers
【24h】

Elastic effects on solubility in semicrystalline polymers

机译：弹性对半结晶聚合物溶解度的影响

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

Capillary column inverse gas chromatography experiments at infinite solvent dilution were conducted for 15 polyethylene/solvent systems. Thermodynamic data were collected for various types of penetrant molecules (normal alkanes, 1-alkenes, isomers of hexane, and ring compounds). Theoretical predictions of the solubility data were made with an activity coefficient model (Universal Functional Group Activity-van der Waals-Free-Volume) (UNIFAC-vdw-FV) and an equation-of-state model (Group-Contribution, Lattice-Fluid, Equation of State) (GCLF-EoS). Although good agreement between the experimental data and theoretical predictions was obtained above the melting point of the polymer, at temperatures below the melting point, significant differences were found. This occurred because at those temperatures, the polymer had a semicrystalline structure and the solubility of the solvent was reduced on account of the constraints on some of the chains in the amorphous phase by the polymer crystallites. The theory developed by Michaels and Hausslein to account for such elastic effects on solubility was incorporated into the two predictive models. After these modifications, the new estimations of the solubility showed significantly improved agreement with the experimental results. Moreover, the elasticity effect resulted in elevated estimates of the crystallinity when inverse gas chromatography retention volumes were used. (C) 2007 Wiley Periodicals, Inc.
机译：在15种聚乙烯/溶剂体系中，在无限溶剂稀释下进行了毛细管柱逆气相色谱实验。收集了各种渗透剂分子（正构烷烃，1-烯烃，己烷的异构体和环化合物）的热力学数据。溶解度数据的理论预测是通过活性系数模型（通用官能团活性-范德华无体积）（UNIFAC-vdw-FV）和状态方程模型（组贡献，格状流体）进行的，状态方程式（GCLF-EoS）。尽管在聚合物的熔点以上获得了实验数据和理论预测之间的良好一致性，但是在熔点以下的温度下，发现了显着差异。发生这种情况的原因是，在这些温度下，聚合物具有半结晶结构，并且由于聚合物微晶对非晶相中某些链的限制，溶剂的溶解度降低了。 Michaels和Hausslein提出的解释这种弹性对溶解度影响的理论已被纳入两个预测模型。经过这些修改后，对溶解度的新估计显示出与实验结果明显改善的一致性。此外，当使用反相气相色谱保留体积时，弹性效应导致提高的结晶度估计值。 （C）2007 Wiley期刊公司

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