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首页> 外文期刊>Journal of Applied Polymer Science >In situ FTIR measurement of carbon dioxide sorption into poly(ethylene terephthalate) at elevated pressures
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In situ FTIR measurement of carbon dioxide sorption into poly(ethylene terephthalate) at elevated pressures

机译：高压下原位FTIR测量二氧化碳在聚对苯二甲酸乙二醇酯中的吸附

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Knowledge of the sorption rate and solubility of CO2 in polymers are of great importance for developing technologies utilizing high-pressure and supercritical CO2-assisted processes. Many conventional techniques for measuring gas sorption have inherent complications when used at elevated pressures. In this work, we demonstrate the use of near-IR spectroscopy as an accurate method to measure CO2 sorption kinetics and solubility in PET at elevated pressures. Sorption kinetics and solubility are measured at 0, 28, and 50 degrees C between pressures of 57.1 and 175.2 atm. Both initially amorphous and initially partially crystalline samples of PET are studied, and the effects of the initial crystallinity are determined. In addition, the effects of CO2 processing on the final crystallinities of our samples are measured. Crystallization was induced in PET at 28 and 50 degrees C over the range of pressures studied. However, at 0 degrees C, no detectable crystallization occurred in PET, even in the presence of high pressures of CO2. The method demonstrated in this work could easily be extended to directly measure CO2 sorption in other polymers. (C) 2000 John Wiley & Sons, Inc. [References: 40]
机译：对于聚合物中二氧化碳的吸附速率和溶解度的了解，对于开发利用高压和超临界二氧化碳辅助工艺的技术至关重要。当在升高的压力下使用时，许多用于测量气体吸收的常规技术具有固有的复杂性。在这项工作中，我们证明了使用近红外光谱作为测量高压下PET中的CO2吸附动力学和溶解度的准确方法。吸附动力学和溶解度是在0、28和50摄氏度，57.1和175.2 atm的压力之间测量的。研究了PET的初始无定形样品和初始部分结晶的样品，并确定了初始结晶度的影响。此外，还测量了二氧化碳处理对我们样品最终结晶度的影响。在所研究的压力范围内，在28和50摄氏度的PET中诱发了结晶。但是，在0摄氏度下，即使存在高压的CO2，在PET中也没有发现可检测的结晶。这项工作中演示的方法可以轻松扩展到直接测量其他聚合物中的CO2吸附。 （C）2000 John Wiley＆Sons，Inc. [参考：40]

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