均聚物结晶与熔融化转变的稳态和亚稳态统计理论 III. 分子分凝统计结晶动力学~熔体内结晶增长速率的一般化表征和它们对生长机制的依赖性  

Statistical Theory of Stable and Metastable Transition for Crystallization and Fusion of Homopolymers III Statistical Dynamics of Polymeric Crystallization by Molecular Segregation A General Characteristics for Growth-Rate of Melt-grown Crystals a

作　　者：宋名实[1] 胡桂贤[1] 王海侨[1] 李效玉[1] 

机构地区：[1]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

出　　处：《Chinese Journal of Chemical Physics》2005年第2期197-210,共14页化学物理学报（英文）

基　　金：ProjectsupportedbytheSpecialFundsforMojorStateResearchProjectsofChina(C1999064809)

摘　　要：首先对微晶粒尺寸增长速率的表征进行总结.从微晶核和粒—高分子链组网络结构特点(高分子链组是微晶核和微晶粒同连接链段的复合体)同增长速率间的三个相关性的特征: ①晶核和晶粒加大同连接链段缩短的并存性; ②微晶核和粒表面上连接链段的缩短机制存有简并性; ③微晶粒内和粒表面上stem的反顺式构象共存性出发.建议了一种评估和计算微晶粒尺寸增长速率的新方法和原则,基于该种计算方法和原则用统计力学和动力学相结合法推导出了高分子熔体内几种不同结晶生长机制(近邻折叠、近邻伸直分凝和近邻折叠同近邻伸直分凝并存等生长方式)下微晶粒—高分子链组中微晶粒数增长速率和微晶粒尺寸增长速率动力学方程.At first a comprehensive and short review on the characteristics for size growth-rate of crystals is presented. Based on the structural model of micro-nucleus- and crystal-constituent chains and the feature of grown mechanism for crystallization by the molecular segregation of stems, a general principle and method for characteristics of the number growth-rate for micro-crystal-constituent chains and the size growth-rate for crystals by melt-crystallization was proposed. According to the principle, a set of quantitative expressions for the number growth-rate of constituent chains with different sizes and different lengths of segments and the size growth-rate of crystals by four different types of growth with folding, extending, parallel combination of folding and extending and series combination of folding and extending chains was derived by the combination method of statistical mechanics and kinetics. Then four growth-rate equations for the number of constituent chains and the size of crystals produced by four different types of growth are also obtained. These equations can be successful in relating the growth-rate to the different types of growth and temperature of crystallization and supper-cooling.

关 键 词：结晶生长机制 结晶生长动力学 晶粒数增长速率 晶粒尺寸增长速率 

分 类 号：O631.1[理学—高分子化学]