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首页> 外文期刊>Journal of Applied Polymer Science >Nonisothermal crystallization of reprocessed poly(ethylene terephthalate)
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Nonisothermal crystallization of reprocessed poly(ethylene terephthalate)

机译：加工后的聚对苯二甲酸乙二醇酯的非等温结晶

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Poly(ethylene terephthalate) was submitted to five reprocessing cycles by extrusion. The materials were analyzed with oligomer and after oligomer extraction. The nonisothermal crystallization of the five samples was investigated by differential scanning calorimetry. Samples with oligomer content and carboxylic end group concentrations between 44 and 98 eqw X 10(6) g presented a nonlinear correlation with the crystallization temperature. After the oligomer extraction of the polymer, this correlation is linear. The nonisothermal crystallization results were analyzed using the Ozawa model. The polymers containing oligomers obey the Ozawa model for the first reprocessing cycle. After oligomer extraction, the polymers obey the Ozawa model from the first to the third reprocessing cycle. In both cases, the exponential n values are close to 2.0. For the other cycles, deviations from this model occur. The activation energy was calculated using the Kissinger and Varma models. The values obtained for the five reprocessed samples were inversely proportional to the molar mass when analyzed by both models. (C) 2003 Wiley Periodicals, Inc. J Appl Polyrn Sci 91: 525-531,2004. [References: 28]
机译：通过挤出将聚对苯二甲酸乙二酯进行五个再加工循环。用低聚物和低聚物萃取后分析材料。通过差示扫描量热法研究了五个样品的非等温结晶。低聚物含量和羧基端基浓度在44至98 eqw X 10（6）g之间的样品呈现出与结晶温度的非线性关系。在聚合物的低聚物提取之后，这种相关是线性的。使用Ozawa模型分析了非等温结晶的结果。包含低聚物的聚合物在第一个后处理循环中服从Ozawa模型。提取低聚物后，从第一个到第三个后处理周期，聚合物遵循Ozawa模型。在这两种情况下，指数n值都接近2.0。对于其他周期，会发生与该模型的偏差。使用基辛格和瓦玛模型计算活化能。当通过两个模型进行分析时，五个再处理样品获得的值与摩尔质量成反比。 （C）2003 Wiley Periodicals，Inc.J Appl Polyrn Sci 91：525-531，2004。 [参考：28]

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