Synthesis and characterization of chitosan-MMT biocomposite systems

• Published in: Carbohydrate polymers Vol. 67; no. 3; pp. 358 - 365
• Main Authors: Günister, Ebru, Pestreli, Dilay, Ünlü, Cüneyt H., Atıcı, Oya, Güngör, Nurfer
• Format: Journal Article
• Language: English
• Published: Oxford Elsevier Ltd 01-02-2007; Elsevier Science
• Subjects: Applied sciences; Biocomposite; Chitosan; Composites; Exact sciences and technology; Forms of application and semi-finished materials; Polymer industry, paints, wood; Rheology; Surface topology; Technology of polymers; Zeta potential; Chitosan; Biocomposite; Rheology; Zeta potential; Surface topology; Clay; Mixing; Montmorillonite; Shear flow; Experimental study; Thermal stability; Morphology; Concentration effect; Oside polymer; Electrokinetic potential; Nanocomposite; Manufacturing; Flow curve; Aqueous dispersion; Apparent viscosity
• ISSN: 0144-8617; 1879-1344
• DOI: 10.1016/j.carbpol.2006.06.004

Chitosan polymer was added to the montmorillonite (MMT) dispersions in different concentrations in the range of 1
×
10
−2–50
×
10
−2
g/L (in 1% acetic acid solution). The rheological behaviours and colloidal properties of the clay dispersions were determined as a function of increasing polymer concentration. The studies on zeta potential measurements indicated that chitosan attached on the surface of clay particles. XRD analyses displayed that organic molecules did not enter enough sufficiently into the layers of clay structures. In the second part of the study, the rheological behaviour of 1
g/L chitosan dispersion in 1% acetic acid solution was investigated. Flow curves were analyzed using the Bingham model. The MMT/chitosan dispersions prepared at concentrations in a range of 1–50
g/g, and then rheological and electrokinetic measurements were repeated for these samples and studied together with the first measurements. The characterization with different methods (FTIR, AFM, DSC, and TGA) on chitosan-MMT biocomposite systems was examined.