Generic placeholder image

Current Nanoscience

Editor-in-Chief

ISSN (Print): 1573-4137
ISSN (Online): 1875-6786

Quaternized Carboxymethyl Chitosan/Organic Montmorillonite Nanocomposite: Effect of Carboxymethyl and Quaternary Ammonium Groups

Author(s): Jiwen Luo, Qiuyun Zhang, Xiaoying Wang and Runcang Sun

Volume 9, Issue 1, 2013

Page: [122 - 127] Pages: 6

DOI: 10.2174/1573413711309010020

Price: $65

Abstract

In order to investigate the effect of the substitution groups on the intercalation, nine quaternized carboxymethyl chitosans (QCMCs) with different degree of substitution (DS) of carboxymethyl and quaternary ammonium groups were intercalated into the interlayer of organic montmorillonite (OMMT). Small-angle XRD, TEM and FT-IR techniques were used to characterize the structure and morphology of QCMC/OMMT nanocomposites, the thermogravity analysis (TGA) was performed to evaluate the thermal stability. The results revealed that positively charged quaternary ammonium groups contributed to the intercalation of QCMC, certain amount of negatively charged carboxymethyl groups could also induce better intercalation, but too much carboxymethyl groups prevented the entrance of QCMC into the interlayer of OMMT. In addition, as carboxymethyl and quaternary ammonium groups increased, the interaction between QCMC and OMMT was stronger, but the thermal stability was lower. When DS of carboxymethyl groups and quaternary ammonium groups in QCMC were respectively 53 % and 41 %, the exfoliated nanocomposite was obtained, in this case, its thermal stability was the highest.

Keywords: Quaternized carboxymethyl chitosan, organic montmorillonite, intercalation, nanocomposite, degree of substitution, thermal stability


Rights & Permissions Print Cite
© 2024 Bentham Science Publishers | Privacy Policy