High-pressure CO2-enhanced polymer interdiffusion and dissolution studied with in situ ATR-FTIR spectroscopic imaging
High-pressure CO2-enhanced polymer interdiffusion and dissolution studied with in situ ATR-FTIR spectroscopic imaging
复制标题
DOI：
10.1016/j.polymer.2006.04.059
复制
发表时间：
2006-06-14
期刊：
影响因子：
4.6
通讯作者：
Kazarian, Sergel G.
中科院分区：
文献类型：
--
作者：
Fleming, Oliver S.;Chan, K. L. Andrew;Kazarian, Sergel G.
衰减全反射傅里叶变换红外（ATR-FFIR）光谱成像技术是研究高压或超临界二氧化碳环境下聚合物相互扩散和溶解的一种新方法。本研究选择了聚乙烯吡咯烷酮（PVP）和不同分子量的聚乙二醇（PEG）的混溶体系。这些系统进行了控制压力的CO2和两种聚合物之间的接触的界面面积进行了研究，通过ATR-FTIR原位成像。使用这种光谱成像方法，聚合物相互扩散的现象，增强溶解在两种聚合物中的CO2作为时间的函数进行了研究。用FTIR成像研究了空间分辨图像随时间的演变，并获得了两种聚合物的相应浓度分布。FTIR成像的化学特异性也使我们能够测量溶解在聚合物系统的每个域中的CO2的量。研究了PEG分子量和CO压力对聚合物互扩散机理和速率的影响。这种方法不仅显示了可视化的相互扩散过程的能力，而且还证明了高压CO2的能力，以“调整”的相互扩散的速率，这一信息是重要的，更好地理解M-诱导的聚合物材料的混合。(c)2006爱思唯尔有限公司保留所有权利。
A novel application of attenuated total reflection Fourier transform infrared (ATR-FFIR) spectroscopic imaging to study polymer interdiffusion and dissolution under high-pressure or supercritical carbon dioxide environments has been demonstrated. Miscible systems of polyvinylpyrrolidone (PVP) and poly(ethylene glycol) (PEG) of different molecular weights have been chosen for this investigation. These systems were subjected to a controlled pressure of CO2 and the interfacial area of contact between the two polymers was Studied by ATR-FTIR imaging in situ. Using this spectroscopic imaging approach, the phenomenon of polymer interdiffusion enhanced by CO2 dissolved in both polymers was investigated as a function of time. The evolution of spatially resolved images as a function of time was studied with FTIR imaging and the corresponding concentration profiles for both polymers were obtained. The chemical specificity of FTIR imaging also allowed us to measure the amount of CO2 dissolved in each domain of the polymer system. Effects of PEG molecular weight and pressure of CO, on the mechanism and the rate of polymer interdiffusion was investigated. This approach has not only shown the ability to visualise the process of interdiffusion but also demonstrated the ability of high-pressure CO2 to 'tune' the rate of interdiffusion, this information is important for a better understanding of M-induced mixing of polymeric materials. (c) 2006 Elsevier Ltd. All rights reserved.