Abstract
Generalized two-dimensional correlation spectroscopy (2DCOS) and its derivate technique, perturbation correlation moving window (PCMW), have found great potential in studying a series of physico-chemical phenomena in stimuli-responsive polymeric systems. By spreading peaks along a second dimension, 2DCOS can significantly enhance spectral resolution and discern the sequence of group dynamics applicable to various external perturbation-induced spectroscopic changes, especially in infrared (IR), near-infrared (NIR) and Raman spectroscopy. On the basis of 2DCOS synchronous power spectra changing, PCMW proves to be a powerful tool to monitor complicated spectral variations and to find transition points and ranges. This article reviews the recent work of our research group in the application of 2DCOS and PCMW in thermoresponsive polymers, mainly focused on liquid crystalline polymers and lower critical solution temperature (LCST)-type polymers. Details of group motions and chain conformational changes upon temperature perturbation can thus be elucidated at the molecular level, which contribute to the understanding of their phase transition nature.
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This work was financially supported by the National Natural Science Foundation of China (Nos. 21274030, 51473038 and 21604024), the Natural Science Foundation of Shanghai (No. 17ZR1440400) and the Open Project of State Key Laboratory of Chemical Engineering (No. SKL-ChE-16C02), and “Chenguang Plan”.
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Sun, St., Wu, Py. Spectral insights into microdynamics of thermoresponsive polymers from the perspective of two-dimensional correlation spectroscopy. Chin J Polym Sci 35, 700–712 (2017). https://doi.org/10.1007/s10118-017-1938-1
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DOI: https://doi.org/10.1007/s10118-017-1938-1