No abstract

DTA/SDTG and DSC techniques were used to study the thermal behaviors of citronellol-β-D-glucopyranoside (CGLY) . The heating rate was 5, 7.5, 10, and 12.5 K▪min -1 , the samples were heated from 30 o C to 500 o 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, Tp=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 133.15 KJ/mol, 126.62KJ/mol respectively, and the correlation was related.

Abstract. Thermal decomposition of α-terpinyl-β-D-glucapyranoside was studied by DTA/SDTG and DSC. The heating rate was 5, 7.5, 10 and 15 K/min, and the samples were heated from the 30 to 500℃, the methods of Friedman and Flynn-Wall-Ozawa were applied to calculate the parameters of thermal degradation. Degradation mechanism was estimated by the methods of Coats-Redfern and Phadnis-Deshpande. TG-DTG curves showed that with the increased heating rate, the mass of α-terpinyl-β-D-glucapyranoside of starting loss T 0 , the biggest rate of mass loss T p and final mass loss T f all have linear increase. So that thermal degradation temperature was mainly influenced by the heating rate B. The DSC curves showed that melting and decomposition proceeded at same time. By Friedman and Flynn-Wall-Ozawa, the activate energy of Ea were 216.63 KJ/mol and 206.18 KJ/mol respectively, with well correlation.