The Kinetics of Extended Chain Crystallization in Polymer Processing

通过仔细控制加工变量，Tree flow诱导的半结晶聚合物结晶可产生长链晶体，这为从廉价原料生产轻质、高强度材料提供了机会。该项目将汇集来自聚合物加工、热力学和计算机模拟领域的研究人员来研究流动诱导结晶动力学。该研究将使用专门设计的流变仪和新开发的流变光学技术来获得可结晶聚合物中流动诱导结晶动力学的原位定量测量。基于当前聚合物分子的分子理论，将开发新的聚合物结晶动力学模型，并将其纳入聚合物加工的模拟中，以优化聚合物加工操作的设计，并考虑延伸链结晶度，而延伸链结晶度又直接关系到产品的机械性能。通过仔细控制加工变量，这项研究可能允许用廉价的聚合物材料生产高性能的塑料部件。

9301693 Tree Flow-induced crystallization of semi-crystalline polymers to produce extended chain crystals provides an opportunity to produce lightweight, high-strength materials from inexpensive feed stocks by carefully controlling the processing variables. The project will bring together researchers from the fields of polymer processing, thermodynamics and computer simulation to study flow- induced crystallization kinetics. The research will use a specially designed rheometer and a newly developed rheo-optic technique to obtain in-situ, quantitative measurements of flow- induced crystallization kinetics in crystallizable polymers. Anew model of polymer crystallization kinetics, based on current molecular theory for polymer molecules, will be developed and incorporated into a simulation of polymer processing in order to optimize the design of polymer processing operations with respect to the degree of extended chain crystallinity, which in turn is directly related to the mechanical properties of the product. The research may allow the production of high performance plastic parts from inexpensive polymer materials through the careful control of processing variables.