THERMAL-BEHAVIOR OF JUTE STICK BLEACHED WITH SODIUM-CHLORITE AND HYDROGEN-PEROXIDE .2.

Thermal behaviour of chlorite-bleached and peroxide-bleached jute stic k was studied by differential scanning calorimetry (DSC) and thermogra vimetry (TG). Bleached jute stick samples are found to be less thermos table than defatted jute stick, whereas chlorite-bleached jute stick i s less thermostable than peroxide-bleached jute stick. Peak maxima tem peratures (in DSC) of bleached jute sticks (attributed to hemicellulos e, alpha-cellulose and lignin) show a gradual shift to lower temperatu res as compared to the corresponding peaks in defatted jute stick. DSC curves show that thermal decomposition patterns of chlorite bleached and peroxide bleached jute sticks are different. This is also confirme d by the nature of the TG curves, where the appearance of decompositio n temperature (T3-degrees-C) in the peroxide bleached jute stick is co mparable with that of alkali treated jute stick samples and is probabl y related to the same cause, i.e. the effect of alkali used in alkalin e peroxide bleaching.