Influence of graphite particles in thermal properties of amylopectin/PVA-based hydrogels.

The aim of the present work is to study the influence of graphite particles on the molecular structure of the hydrogel composed of amylopectin/poly(vinyl alcohol) hybrid matrix by thermogravimetric analysis, differential scanning calorimetry and dynamic mechanical thermal analysis techniques. Hybrid amylopectin/PVA hydrogels were prepared with and without particles, and their properties were measured. The results of the analyses showed that the presence of particles in the reaction medium decreased the formation of cross-links among macromolecular chain segments, modifying thermal and mechanical properties of hydrogel. Raman spectroscopy confirmed the obtaining of graphitic carbon particles. Besides, optical microscopy and atomic force microscopy showed a large distribution in particles dimensions. [ABSTRACT FROM AUTHOR]