以下为句子列表：
英文: A mathematical model for the polycondensation process in PET production is developed.
中文: 介绍了一个工业化聚酯(PET)生产过程中的缩聚模型。
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英文: Abstract: The mathematical model that describes the reaction kinetics and molecular weight distribution for the polycondensation reaction process is developed by methods of reaction extent and generation function,in which an industrial process of poly(eth
中文: 文摘:以一个工业化聚酯生产过程为例，将反应度法和生成函数作为工具，建立了描述此类缩聚反应过程的反应动力学及其分子量分布的数学模型，并介绍了求解数学模型的方法。
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英文: Abstract: Through copolycondensation method, a phenol-melamine-urea-formaldehyde resin was prepared. The discussion was concentrated on the preparation method of the resin and it's application condition in pressing exterior-type medium density fiberboard.
中文: 文摘:通过共缩聚的方法，制备了具有良好的耐水性能和胶合性能的苯酚-三聚氰胺-尿素-甲醛树脂。着重讨论了该树脂的制备方法以及在压制室外型中密度纤维板中的应用情况。
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英文: Polycondensation catalyst may has bad effect on polyester afterprocessing properties.
中文: 缩聚催化剂会对聚酯后加工性能产生不良影响。
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英文: The abnormal conditions of polyester vaccum system such as the frequent exchanging of liquid-ring pump in prepolycondensation Ⅰ, the occlusion of scraped condenser and vaccum atmospheric leg, the EG spray flow decreasing of vaccum injection pump, the work
中文: 摘要对聚酯真空系统的异常情况如预聚Ⅰ液环泵频繁切换，刮板冷凝器、真空大气腿堵塞、真空喷射泵EG喷淋流量降低，喷射泵本体工作性能偏低等进行了分析。
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