Thermal Decomposition Kinetics Analysis of Citronellol-β-D-glucopyranoside

DTA/SDTG and DSC techniques were used to study the thermal behaviors of citronellol-beta-D-glucopyranoside (CGLY). The heating rate was 5, 7.5, 10, and 12.5 K.min(-1), the samples were heated from 30 degrees C to 500 degrees C. Methods of Friedman and Flynn-Wall-Ozawa were applied to calculate the parameters of thermal degradation, the parameters were substituted to the methods of Coats-Redfern and Phadnis-Deshpande to estimated degradation mechanism. The TG-DTG curves showed that with the increased heating rate, the mass of starting loss T0, the biggest rate of mass loss Tp and final mass loss T-f met the functions respectively: T-0=3.8825B+194.97, T-p=2.2825B+281.47, Tf=5.5825B+305.72. The DSC curve showed that melting and decomposition proceeded at sametime. By Friedman and Flynn-Wall-Ozawa, thermal degradation of the apparent activation energy Ea are obtained, which are 133.15KJ/mol, 126.62KJ/mol respectively, and the correlation was related.