• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Thermochimica Acta: An International Journal Concerned with the Broader Aspects of Thermochemistry and Its Applications to Chemical Problems >The kinetic parameters for the evaporation of plasticizers from plasticized poly(vinyl chloride)
【24h】

The kinetic parameters for the evaporation of plasticizers from plasticized poly(vinyl chloride)

机译：从增塑的聚氯乙烯中蒸发增塑剂的动力学参数

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

The process of loss of plasticizers: dioctyl phthalate, diisononyl phthalate, benzylbutyl phthalate, dioctyl adipate, phosphate plasticizer Reofos, polymeric plasticizer Reoplex and epoxidized soybean oil from plasticized poly(vinyl chloride) folies was studied by the method of isothermal thermogravimetry in the temperature range 120-150 degreesC. The investigated samples contained ca. 10-40 wt.% of plasticizers. The rate constants of the process of loss of plasticizers were calculated and the dependence of the rate constant on temperature and on the initial concentration of plasticizer in plasticized PVC were mathematically defined. The concentration dependence of the rate constant is expressed by parameters k(0) and q. The linear dependence of the function k = f(c(0)) suggests that the process of evaporation from the polymer surface, being slower, governs the process of the loss of plasticizers. The activation energy of the process was calculated from the exponential dependence of the rate constant of evaporation on temperature. Compensation parameters were also calculated as a measure of reaction ability of the system. The role of various parameters (molecular weight, static and dynamic structure of polymer, polarity) on the kinetic parameters of evaporation of plasticizers were discussed. (C) 2002 Elsevier Science B.V. All rights reserved. [References: 8]
机译：通过等温热重法在温度范围内研究了邻苯二甲酸二辛酯，邻苯二甲酸二异壬酯，邻苯二甲酸苄基丁酯，己二酸二辛酯，磷酸酯增塑剂Reofos，聚合物增塑剂Reoplex和环氧化大豆油中增塑剂的损失过程。 120-150℃。调查的样品包含约。 10-40 wt。％的增塑剂。计算了增塑剂损失过程的速率常数，并数学定义了速率常数对温度和增塑剂在聚氯乙烯中的初始浓度的依赖性。速率常数的浓度依赖性由参数k（0）和q表示。函数k = f（c（0））的线性依赖性表明，从聚合物表面蒸发的过程较慢，控制了增塑剂的损失过程。该过程的活化能由蒸发速率常数对温度的指数依赖性来计算。还计算补偿参数作为系统反应能力的量度。讨论了各种参数（分子量，聚合物的静态和动态结构，极性）对增塑剂蒸发动力学参数的作用。 （C）2002 Elsevier Science B.V.保留所有权利。 [参考：8]

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