Hydroxyl Changing Mechanism of Cotton Cellulose during Alkaline Treatment Characterized by ATR-FTIR in Combination with Two-Dimensional Correlation Spectroscopy. Issue 5 (September 2020)

• Record Type: Journal Article
• Authors: Ji, Bolin; Cai, Zijing; Sun, Gang; Yan, Kelu
• Is Part Of: AATCC Journal of Research. Volume 7:Issue 5(2020)
• Page Start: 1
• Page End: 8
• Publication Date: 2020-09
• Subjects: 2Dcos -- Cellulose -- Fourier Transform Infrared Spectroscopy -- Gaussian -- Hydrogen Bonds -- X-ray Diffraction
• DOI: 10.14504/ajr.7.5.1
• Languages: English
• ISSNs: 2472-3444

Abstract

Hydroxyl changes of cotton cellulose treated with sodium hydroxide (NaOH) solution is closely related with hydrogen bonding (H-bonds) between different hydroxyls, which is difficult to directly measure by common instrumentational methods of X-ray diffraction (XRD) or Fourier transform infrared (FTIR) spectroscopy. Two-dimensional correlation spectroscopy (2Dcos) is a powerful tool to analyze the changes of molecular spectroscopy. In this study, the alkaline-treated cotton cellulose was monitored in real time by attenuated total reflection (ATR) in combination with 2Dcos. Results indicated that the H-bonds changed in the following sequence order: v (O3-H3…O5) (intramolecular) → v (O6-H6…O3′) (intermolecular) → v (O2-H2…O6) (intramolecular). Moreover, Gaussian computational modeling analysis also confirmed this mechanism. Both XRD and FTIR results indicated the decrease of crystallinity of the alkaline-treated cotton cellulose over prolonged time.