引用本文:
【打印本页】   【HTML】   【下载PDF全文】   View/Add Comment  【EndNote】   【RefMan】   【BibTex】
←前一篇|后一篇→ 过刊浏览    高级检索
本文已被:浏览 887次   下载 1027 本文二维码信息
码上扫一扫!
分享到: 微信 更多
Statistical Theory of Stable and Meta stable Transition for Crystallization and Fusion of Homopolymers ⅣStatistical Dynamics of Polymeric Crystallization by Molecular Segregation-Division of Crystal Grow-rate Regimes and Their Temperature and Grown Mechan
Song Mingshi*, Xu Qiang, Hu Guixian, Wang Haiqiao, Wu Sizhu, Li Xiaoyu
The Key Laboratory of Science and Technology of Controlled Chemical Reaction, Ministry of Education, Beijing University of Chemical Technology, Beijing 100029
Abstract:
First a short review on the crystal growth theories and the experimental data was presented. Then a set of quantitative expressions for the size growth-rate of crystals produced by four different micro-growth mechanisms (folding, extending and two types of combination for folding and extending) was derived by a general evaluating method. A set of quantitative expressions for the correlations between the crystal size growth-rate and the product of crystalline temperature and super-cooling temperature at four different micro-growth mechanisms was obtained. Three growth-rate regimes were divided, the variations of the morphology for the crystals in the three types of regimes with the crystalline and super-cooling temperatures were discussed. They showed that these theoretical correlations between the morphology of crystals and the crystalline and super-cooling temperatures are in agreement with the later important observation on the lateral shape of crystals.
Key words:  Kinetics of crystallization, Crystal size growth-rate, Crystal growth-rate regimes, Micro-growth mechanism
FundProject:
均聚物结晶与熔融化转变的稳态和亚稳态统计理论Ⅳ 分子分凝统计结晶动力学~结晶增长区域的区划和它们对温度和生长机制的依赖性
宋名实*, 徐强, 胡桂贤, 王海侨, 吴丝竹, 李效玉
北京化工大学可控化学反应科学与技术基础教育部重点实验室,北京,100029
摘要:
首先对高分子结晶增长动力学的实验规律进行全面总结,并指出了当前高分子结晶增长动力理论中存在的难题.然后按我们建议的评估微晶粒尺寸增长速率的新方法推导出了四种不同微观生长机制(折叠、伸直、折叠同伸直并联并存和折叠同伸直串联并存等方式)下微晶粒高分子链组的微晶粒尺寸增长速率定量表征式,又导出了四种不同生长机制下微晶粒尺寸增长速率同结晶温度和过冷温度间关系的表达式.根据四种不同微观生长机制同宏观增长方式差别和它们出现的结晶温度同过冷温度之积值高低,可把结晶动力学的结晶增长区域图中三组交叉线区划为三个不同增长区域
关键词:  结晶动力学  微晶尺寸增长速率  结晶增长区域  微观生长机制
DOI:10.1088/1674-0068/18/3/379-388
分类号: