THERMAL STABILITY OF BIO-NANOCOMPOSITE FILMS BASED ON POLY(VINYL ALCOHOL)/STARCH/CELLULOSE NANO-CRYSTALS

摘要

Thermal stability of polymeric materials is one of the most important properties which ultimately govern the mechanical properties, durability, spectral stability, shelf lives, and life cycles of polymers. In this context, TGA is a useful method to investigate the thermal stability of polymeric systems. The aim of this work is to evaluate the influence of starch (S) and cellulose nano-crystals (CNC) content on the thermal stability of poly(vinyl alcohol)(PVA)/starch (S) and PVA/S/CNC films. The TGA curves of the studied materials, registered in the 25-700℃ temperature range, show that all samples exhibited four distinct and well-separated weight-loss processes which are better evidenced in derivative thermogravimetric (DTG) curves. The shifting to higher value of both onset and maximum temperatures and the decreasing of the mass loss for the blends containing CNC suggests the formation of more compact structures, confirming the reinforcing effect of the CNC.