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首页> 外文期刊>Journal of Applied Polymer Science >THERMAL EFFECTS DUE TO POLYMER CRYSTALLIZATION
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THERMAL EFFECTS DUE TO POLYMER CRYSTALLIZATION

机译：聚合物结晶化的热效应

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摘要

The problem of dissipation of latent heat of fusion by thermal conductivity in polymer crystallizing in bulk is discussed. It is shown that the liberation of latent heat of fusion causes the increase of the temperature at the crystallization front. The increase of thermal conductivity and diffusivity of a polymer due to phase transition decreases while the presence of another crystallization front increases the temperature elevation. The temperature buildup is limited by the decrease of growth rate with temperature, directly related to the release of latent heat of fusion. The thermal effects due to crystallization of numerous spherulites in a plate are also estimated. It is shown that the crystallization causes a significant increase of the temperature inside the material as the crystallization proceeds, which slows the rate of conversion of melt into spherulites. The temperature increase in the interior of material depends on the initial temperature and on the sample sizes. The predictions were confirmed by the measurements of the temperature in bulk samples of isotactic polypropylene during crystallization at isothermal ambient conditions. (C) 1997 John Wiley & Sons, Inc. [References: 30]
机译：讨论了聚合物结晶过程中热导率消散熔融潜热的问题。结果表明，熔化潜热的释放引起结晶前沿温度的升高。由于相变，聚合物的热导率和扩散率的增加减少，而另一种结晶前沿的存在则增加了温度升高。温度的升高受到生长速率随温度降低的限制，而温度的降低直接与熔化潜热的释放有关。还估计了由于板上大量球晶结晶而产生的热效应。结果表明，随着结晶的进行，结晶导致材料内部温度的显着升高，这减慢了熔融物转变为球晶的速度。材料内部的温度升高取决于初始温度和样品大小。这些预测通过在等温环境条件下结晶过程中等规聚丙烯批量样品中温度的测量得到证实。 （C）1997 John Wiley＆Sons，Inc. [参考：30]

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