Hydroxyl Changing Mechanism of Cotton Cellulose during Alkaline Treatment Characterized by ATR-FTIR in Combination with Two-Dimensional Correlation Spectroscopy

Autor:	Zijing Cai, Bolin Ji, Kelu Yan, Gang Sun
Rok vydání:	2020
Předmět:	chemistry.chemical_compound Polymers and Plastics chemistry business.industry Process Chemistry and Technology Materials Chemistry Medicine Cellulose Fourier transform infrared spectroscopy business Two-dimensional nuclear magnetic resonance spectroscopy Mechanism (sociology) Nuclear chemistry
Zdroj:	AATCC Journal of Research. 7:1-8
ISSN:	2330-5517
DOI:	10.14504/ajr.7.5.1
Popis:	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: ν(O3–H3...O5) (intramolecular) → ν(O6–H6...O3') (intermolecular) → ν(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.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::498df99431a3d8af71bef12a8877a3c0 https://doi.org/10.14504/ajr.7.5.1 Zobrazit plný text záznamu