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首页> 外文期刊>Macromolecular symposia >Quantification of Colour Formation in PET Depending on SSP Residence Time, Temperature, and Oxygen Concentration
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Quantification of Colour Formation in PET Depending on SSP Residence Time, Temperature, and Oxygen Concentration

机译：根据SSP停留时间，温度和氧气浓度对PET中颜色形成的定量

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摘要

A systematic approach was carried out to quantify the discolouration of different poly(ethylene terephthalate) (PET) samples such as virgin bottle-grade resins, bottle-to-bottle recycled chips, and bottle-to-bottle recycled flakes. The PET samples were treated in a fixed bed reactor in the solid-state. The possible influencing parameters such as residence time, temperature, and oxygen partial pressure were studied by analysing the CIELAB b~*-coordinate (axis=yellow to blue) with a spectrophotometer at the end of the experiment. The PET samples were analysed once as chips respectively flakes retained from the experiments and again as plates obtained from a following standardised melting procedure. The combination of experiments and literature review results in the proposal of different discolouration mechanisms, which are influenced by temperature, residence time, and oxygen concentration. Using the design of experiments (DoE) approach, a mathematical model was compiled that can be used to predict the yellowing of the different PET grades.
机译：进行了系统的方法来量化不同的聚对苯二甲酸乙二酯（PET）样品的变色，例如原始瓶级树脂，瓶对瓶回收碎片和瓶对瓶回收薄片。 PET样品在固态固定床反应器中处理。在实验结束时，通过使用分光光度计分析CIELAB b〜*坐标（轴=黄色到蓝色），研究了可能的影响参数，例如停留时间，温度和氧分压。对PET样品进行分析，一次是从实验中保留下来的碎片或薄片，另一次是从以下标准化熔化程序中获得的平板。实验和文献综述的结合导致提出了不同的变色机理，其受温度，停留时间和氧气浓度的影响。使用实验设计（DoE）方法，编译了数学模型，该模型可用于预测不同PET等级的黄变。

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