The Thermal Decomposition of Polyvinylbutyral/PLZT, PMN Dielectric Powder Composite

The thermal decomposition of polyvinylbutyral (PVB) and polyvinylbutyral/PLZT, PMN dielectric powder composite was studied using pyrolysis gas chromatograph method. On thermal decomposition of only PVB, at 255°C n-butanal was begun to eliminate and then many gas products which were n-butanal, acetaldehyde, 2-butenal, dihydrofuran, benzene, and propane etc., were clearly begun to eliminate at about 400°C. In the PVB/PLZT, PMN dielectric powder composite, PVB thermal decomposition was clearly begun at lower temperature that was about 300°C than only PVB case. The gas products were same. The velocities of decomposition of PVB and the activation energy were tried to be calculate. The velocity of thermal decomposition of PVB was 0.01s-1 at 386°C. In the PVB/PLZT and PVB/PMN dielectric powder composite, these of thermal decomposition of PVB were respectively 0.65 and 2s-1 at 386°C. The activation energy of PVB thermal decomposition was 70kcal/mol and in the PVB/PLZT, PMN dielectric powder composite that was 21kcal/mol.