EFFECTS OF CHITOSAN CHARACTERISTICS ON ITS THERMAL STABILITY

Jorge Augusto de Moura Delezuk, Adriana Pavinatto, Sergio Paulo Campana Filho
2014 Brazilian Journal of Thermal Analysis  
Chitosan samples exhibiting different characteristics, namely average degree of acetylation (7.5% < DA < 25.0%), viscosity average molecular weight (1.17x10 5 g mol -1 < Mv < 6.45x10 5 g mol -1 ) and crystallinity index (19.1% < CI < 52.7%), were produced by applying nonisothermal ultrasound-assisted deacetylation process (NIUSAD) to beta-chitin extracted from squid pens. The effects of these characteristics on the thermal stability of chitosan were investigated by performing thermal analysis
more » ... synthetic air atmosphere. The results showed that the thermal stability of NIUSAD chitosan depended on Mv, DA and CI, the last being the main factor affecting the onset degradation temperature (T onset ). Accordingly, the more stable NIUSAD chitosans (T onset > 280 o C) corresponded to the samples whose crystallinity index was inserted in a quite narrow interval (45% < CI < 50%).
doi:10.18362/bjta.v3i3-4.27 fatcat:yuk5wujmcjgl5h6a4grxrthdwm