Temperature-Dependent Changes in Hydrogen Bonds in Cellulose Ialpha Studied by Infrared Spectroscopy in Combination with Perturbation-Correlation Moving-Window Two-Dimensional Correlation Spectroscopy: Comparison with Cellulose Ibeta2

• Published in: Biomacromolecules Vol. 8; no. 9; pp. 2969 - 2975
• Main Authors: Watanabe, Akihiko, Morita, Shigeaki, Ozaki, Yukihiro
• Format: Journal Article
• Language: English
• Published: 01.01.2007
• ISSN: 1525-7797; 1526-4602
• DOI: 10.1021/bm700678uPII:S1525-7797(70)00678-5

Our recent IR study demonstrated that hydrogen-bond structure in cellulose Ibeta2 drastically changes around 220 degree C (Watanabe et al. Biomacromolecules 2006, 7, 3164). In the present study, temperature- dependent IR spectra of cellulose Ialpha from 30 to 260 degree C were analyzed by use of perturbation-correlation moving-window two-dimensional correlation spectroscopy. It was observed that as in the case of cellulose Ibeta2 abrupt changes in the hydrogen-bond structure occur around 220 degree C in cellulose Ialpha. It was also revealed that although weakly hydrogen-bonded OH groups in Ibeta2 are stable below 230 degree C thermal oxidation of those in Ialpha is accelerated around 220 degree C. In this way, the present study has clarified a difference between the thermal behavior of Ialpha and that of Ibeta2 at the functional group level. Our result suggests that the drastic change in the hydrogen-bond structure around 220 degree C makes cellulose Ialpha much more unstable than Ibeta2.