Thermal Characterization of Organotin Compound (TPT) using DTA, DSC and TG Thermal Analyses
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概要
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In this study, a thermal degradation pathway of Triphenyltin (TPT) is proposed. The thermal analyses of TPT were performed using elementary analysis (CHO), X-ray diffraction with differential thermal analysis (DTA), differential scanning calorimetry (DSC) and thermogravimetry (TG) .<BR>It was revealed that TPT experienced internal structural changes at 88°C and melted at 123°C . In addition, two phenyl groups were extruded at 230°C resulting in the formation of mono-<I>n</I>-phenyltin hydroxide. Subsequently, degradation to inorganic tin occurred at 380°C following the extrusion of the residual phenyl group at 280 °C. It was determined that TPT was ultimately oxidized to tin oxide in air from the results of the DTA, TG and CHO analyses<BR>From the results of the DSC analysis, the enthalpy of formation (Δ<I>H</I>°<SUB>f</SUB>) of SnO<SUB>2</SUB> was calculated to be 363 KJ/mol, which is lower than the standard value of 580 KJ/mol. The reason for this lower calculated value was thought to be due to the final products being a mixture of SnO and SnO<SUB>2</SUB> as evidenced from the experimental results of X-ray diffraction.<BR>TPT is composed of a tetra-hedral structure with four groups sharing the sp<SUP>3</SUP> hybrid orbital of the tin atom and it has one hydroxyl group and three phenyl groups, so that there is a positional molecular distortion. In addition, the TPT molecule has a localized polarity due to the electro-negativity of the hydroxyl radical.<BR>In conclusion, it was suggested that the extrusions of the phenyl groups of TPT occur stepwise, because of the difference in the degree of bonding between the phenyl groups and the tin atom.
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