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简单模型和湿度冷却速率使得等温结晶变得容易
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An understanding of the kinetics of the crystallization process is important for the selection of processing parameters such as mold temperature and hold time during injection molding. Differential scanning calorimetry (DSC), is an excellent tool for following the progress of crystallization. A popular method for obtaining kinetics data known as isothermal crystallization, is based on rapidly cooling the sample from the melt to the crystallization temperature and then measuring the heat evolved while the sample is held isothermal. The model most often applied to isothermal crystallization data is the Avrami model. This model, while possessing physically significant parameters, is somewhat difficult to analyze. In this study, a simpler kinetic model, the Sestak-Berggren model, is applied to crystallization kinetics. The equivalency of the resultant kinetic parameters to those from the Avrami model is demonstrated. Furthermore, it is shown that modest cooling rates, as low as 5oC/minute, may be used to obtain good kinetic results. |
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2017-03-02 10:36:54, 290.38 K
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