Thermal degradation studies of poly(o-anisidine) doped with 5-sulfosalicylic acid |
| |
| Authors: | Mostafa I Abd-Elrhaman Seddique M Ahmed |
| |
| Institution: | (1) Physics Department, Faculty of Science, Assiut University, 71516 Assiut, Egypt;(2) Chemistry Department, Faculty of Science, Assiut University, 71516 Assiut, Egypt |
| |
| Abstract: | Thermal decomposition of the solid state of poly(o-anisidine) (POAN) base (POAN-EB) and salt doped with 5-sulfosalicylic (SSA) acid] (SSA-doped POAN) forms has been studied
by thermogravimetric analysis (TGA) and differential thermal analysis (DTA) under non-isothermal conditions. The potential
(PE) and optimum molecular geometric (OMG) energies of the repeating unit (tetramer form) of investigated matrix were calculated
using molecular mechanics (MM+) calculations. These calculations (PE= −3.48×109 and OMG=−122.72 kJ mol−1) indicate that the optimum molecular geometric structure of this matrix is highly stable. The empirical formula of the doped
polymer is best represented by POAN-2SSA.n/6H2O] and substantiate by elemental analysis and MM+ calculations. The full polymer decomposition and degradation were found
to occur in three stages during the temperature increase. The decomposition activation energy (E
d) of both POAN base (POAN-EB) and its doped (SSA-doped POAN) were calculated by employing different approximations. The heating
rate of decomposition and the frequency factor (k
o
) as well as kinetic parameters were calculated for doped or base form of this matrix. A remarkable heating rate dependence
of the decomposition rate of the SSA-doped POAN matrix was observed. |
| |
| Keywords: | Poly(o-anisidine) TGA DTA MM+ calculation |
| 本文献已被 SpringerLink 等数据库收录！ |
