Study on Temperature-Dependent Changes in Hydrogen Bonds in Cellulose 1beta by Infrared Spectroscopy with Perturbation-Correlation Moving-Window Two-Dimensional Correlation Spectroscopy

摘要

Infrared(IR)spectra were measured for cellulose 1beta prepared from the mantle of Halocynthia roretzi over a temperature range of 30-260 deg C to explore the temperature-dependent changes in hydrogen bonds(H-bonds)in the crystal.Structural changes at the phase transition temperature of 220 deg C are elucidated at the functional group level by perturbation-correlation moving-window two-dimensional(PCMW2D)correlation spectroscopy.The PCMW2D correlation spectra show that the intensities of bands arising from O3-H3...O5 and O2-H2...O6 intrachain H-bonds dramatically decrease at 220 deg C,whereas the intensity changes of bands due to interchain H-bonds are not observed adequately.These results suggest that the phase transition is induced by the dissociation of the O3-H3...O5 and O2-H2...O6 intrachain H-bonds.However,the interchain H-bonds are not so much responsible for the transition directly.