• 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 >Curing Kinetics of Divinyl Ester Resins with Styrene
【24h】

Curing Kinetics of Divinyl Ester Resins with Styrene

机译：用苯乙烯固化二乙烯基酯树脂的动力学

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 curing reaction of a dinvyl ester resin with different proportions of styrene-4,20, and 40% by weight-was investigated by differential scanning calorimetry (DSC) using isothermal and dynamic modes. The different constraints on the reaction rate was globally considered, taken the reaction as divided in two regimens: below the vitrification regimen and during the vitrificaton regimen. Below the vitrification regimen, the autocatalytic model devloped by Kamal was used to perform the analysis of the curing kinetics of divinyl ester resin with styrene. Experimental data from dynamic and isothermic runs, at a fixed composition, were simultaneously considered, while the actual temperature records (measured during the DSC runs) were also taken into account. The adjusted kinetic parameters took into account the gel effect on the radicals' termination rate and the structure constraints on the reacativity of pendant vinyls groups, during this stage. During the vitrification stage, the diffusion control due to the low mobility of the reacitive groups and molecules was incorporated into the overall rate constant according to Rabinowitch model, which considers the two regimen contributions to the overall reaction rate kinetic. The Vogel-Fulcher relationship was adopted to express the temperature dependence of the rate constant during the vitrification stage. The method presented here has been satisfactorily applied to dynamic and isothermal curing reactions, allowing a simple and general kinetic expression useful in the design, optimization, and control of the processing of composites based on these thermoset polymres to be obtained.
机译：通过差示扫描量热法（DSC），使用等温和动态模式研究了具有不同比例的苯乙烯-4,20和40％重量比的二乙烯基酯树脂的固化反应。总体上考虑了对反应速率的不同限制，将反应分为两种方案：玻璃化方案以下和玻璃化方案期间。在玻璃化方案以下，使用Kamal开发的自动催化模型对二乙烯基酯树脂与苯乙烯的固化动力学进行分析。同时考虑了固定组成下动态和等温运行的实验数据，同时还考虑了实际温度记录（在DSC运行期间测量）。在此阶段，调整后的动力学参数考虑了凝胶对自由基终止速率的影响以及结构对乙烯基侧基重排率的限制。在玻璃化阶段，根据Rabinowitch模型，由于反应性基团和分子迁移率低而导致的扩散控制被纳入总速率常数，该模型考虑了两种方案对总反应速率动力学的影响。采用Vogel-Fulcher关系表示玻璃化阶段速率常数的温度依赖性。此处介绍的方法已令人满意地应用于动态和等温固化反应，从而使简单，通用的动力学表达式可用于基于这些热固性聚合物的复合材料的设计，优化和控制。

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