• 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 >Novel Observations on Kinetics of Nonisothermal Crystallization in Fly Ash Filled Isotactic-Polypropylene Composites
【24h】

Novel Observations on Kinetics of Nonisothermal Crystallization in Fly Ash Filled Isotactic-Polypropylene Composites

机译：粉煤灰填充全同立构聚丙烯复合材料非等温结晶动力学的新观察

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

A study on nonisothermal crystallization kinetics in fly ash (FA) filled isotactic-polypropylene (PP) composites has revealed some interesting phenomena. Composites made by injection moulding of PP with 0, 20, 45, and 60 wt % of FA were nonisothermally studied using differential scanning calorimetry at cooling rates 10 degrees C, 15 degrees C, and 20 degrees C per min from a melt temperature of 200 degrees C cooled to -30 degrees C. Whilst neat PP showed a mono modal alpha crystalline phase- only structure, presence of FA led to bimodal thermographs revealing partial transcrystallisation of alpha into beta, to maximum 14%. The onset and peak crystallization temperatures of all samples decreased by similar to 3 degrees C with each 5 degrees C/min increase in cooling rate. Parameters such as crystal growth rate, dimensions, and activation energy were determined using a series of established models. The Avrami graphs showed that contrary to the published data, there are two sets of straight lines (a) with a lower slope at low cooling rate and (b) with a distinctly higher slope for high cooling rate. Activation energy of the materials reached a maximum at 45% FA.
机译：对粉煤灰（FA）填充的全同立构聚丙烯（PP）复合材料的非等温结晶动力学的研究揭示了一些有趣的现象。使用差示扫描量热法以每分钟10摄氏度，15摄氏度和20摄氏度的冷却速率从200的熔融温度进行非等温研究了通过注塑成型具有0、20、45和60 wt％FA的PP制成的复合材料℃冷却至-30℃。纯聚丙烯显示仅单峰α晶相结构，而FA的存在导致双峰热像图显示α部分转化为β，最高达到14％。所有样品的开始和峰值结晶温度降低了约3摄氏度，冷却速率每升高5摄氏度/分钟。使用一系列已建立的模型确定诸如晶体生长速率，尺寸和活化能的参数。 Avrami图显示，与已公开的数据相反，有两组直线（a）在低冷却速率下具有较低的斜率，以及（b）对于高冷却速率具有明显较高的斜率。材料的活化能在45％FA时达到最大值。

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