高分子结晶4上crystallizationofpolym.ppt

1、Chapter 7 The computer simulation and data process of polymer crystallization 1. Advance in simulation of polymer crystallization 2. Software (Matlab, mathcad, origin),为什么要进行计算机模拟实验,实际实验和解析理论发生矛盾 不能进行的实验的预测 国际上限制的实验 难以观察的实验现象的教学 工艺过程的模拟 对实际实验的可能性进行预测,Extensions of the Avrami Equation to Various Poly

2、mer Crystallization Models JAMES N. HAY* and ZBIGNIEW J. PRZEKOP Department of Chemistry, The University of Birmingham, Birmingham B15 2TT, England J. Polym. Sci., Polym. Phys. Ed., 1979, 17(6), 951-9,Computer modelling studies of the progress of crystallization in polymer melts mixed mechanism, vol

3、ume shrinkage variable crystalline density nonrandom nucleation. It is concluded that the Avrami equation is a reasonable approximation to most of these systems except (c).,Clearly, the computer simulation of polymer crystallization as described above is potentially a powerful technique for assessin

4、g models. As used above, it had its limitations, as the number of scanning points adopted was restricted by the computational time, but with faster and more powerful computers this technique will become more accurate and more successful.,Galeski (1981) simulated two-dimensional and three-dimensional spherulite growth and showed the Avrami exponent, the spherulite size distributions and morphology for different nucleation modes.,Computer simulation showed that the type of primary nucleation influences not only the Avrami exponent but