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首页> 外文期刊>Journal of Applied Polymer Science >Experimental and modeling study of the solid state polymerization of poly(ethylene terephthalate) over a wide range of temperatures and particle sizes
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Experimental and modeling study of the solid state polymerization of poly(ethylene terephthalate) over a wide range of temperatures and particle sizes

机译：聚对苯二甲酸乙二醇酯在较大温度和粒径范围内固态聚合的实验和模型研究

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摘要

The solid state polymerization (SSP) of poly(ethylene terephthalate) was studied experimentally over a wide range of pellet sizes and temperatures. A comprehensive model was developed. It considered polycondensation, degradation and polycondensation of vinyl end groups together with diffusion. The reaction rate constants, diffusivities and the corresponding activation energies were obtained through parameter identification using experimental data. The effects of the reaction temperature and pellet size on the SSP time were also investigated. A decrease in the particle size decreases the concentration of the vinyl end groups and narrows the concentration distribution of end groups inside poly(ethylene terephthalate) particles. A decrease in the size of pellets also favors diffusion. Nevertheless it is preferable that the size of pellets be between 1 and 2 mm because too small pellets bring about difficulties with preparation and handling.
机译：在很宽的颗粒尺寸和温度范围内，对聚对苯二甲酸乙二醇酯的固态聚合（SSP）进行了实验研究。开发了一个综合模型。它考虑了乙烯基端基的缩聚，降解和缩聚以及扩散。通过使用实验数据进行参数识别，获得了反应速率常数，扩散率和相应的活化能。还研究了反应温度和颗粒尺寸对SSP时间的影响。粒径的减小降低了乙烯基端基的浓度，并使聚对苯二甲酸乙二醇酯颗粒内的端基的浓度分布变窄。颗粒尺寸的减小也有利于扩散。然而，优选的是粒料的尺寸在1-2mm之间，因为太小的粒料会给制备和处理带来困难。

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