Investigation of CO2 sorption in molten polymers at high pressures using Raman line imaging
Investigation of CO2 sorption in molten polymers at high pressures using Raman line imaging
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DOI：
10.1016/j.polymer.2012.11.053
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发表时间：
2013-01
期刊：
影响因子：
4.6
通讯作者：
O. Knauer;M. Carbone;A. Braeuer;E. Maio;A. Leipertz
中科院分区：
文献类型：
--
作者：
O. Knauer;M. Carbone;A. Braeuer;E. Maio;A. Leipertz
熔融聚（ε-己内酯）（PCL）中的 CO2 吸附已通过时间分辨拉曼线成像进行了研究，本文介绍了该技术作为瞬态吸附实验期间直接测量聚合物内部气体质量分数分布的新技术。将熔融 PCL 在光学可访问压力池中暴露于 80°C 和高达 7.1 MPa 压力的加压二氧化碳中。在吸附过程中，拉曼光谱在 PCL 液滴上获得时间和空间分辨率，从而可以评估 PCL/CO2 相互扩散性、PCL 中 CO2 的溶解度，并确定 PCL 内二氧化碳质量分数分布的时间演变。
CO2sorption in molten poly(ε-caprolactone) (PCL) has been investigated by temporally resolved Raman line imaging, which is introduced here as a new technology for the direct measurement of gas mass fraction profiles inside polymers during transient sorption experiments. Molten PCL was exposed to pressurized carbon dioxide in an optically accessible pressure cell at 80 °C and pressures up to 7.1 MPa. During sorption, Raman spectra were acquired temporally and spatially resolved across the PCL drop, allowing the evaluation of the PCL/CO2mutual diffusivity, of the CO2solubility in PCL, and the determination of temporal evolution of mass fraction profiles of carbon dioxide inside PCL.