Thermally conductive composites based on Al2O3-filled poly(butylene terephthalate)/bisphenol-A polycarbonate (PBT/PC) blends were prepared with a melting mix technique by use of twin screw extruding.Triphenylphosphite (TPPi) as an inhibitor was used to suppress the transesterification between PBT and PC.The transesterification

thermally conductive property

phase structure

crystallization parameters and mechanical properties of the materials were characterized by Fourier transform infrared spectroscopy (FTIR)

laserflash thermal analysis

scanning electron microscopy (SEM)

differential scanning calorimetry (DSC) and mechanical properties tester

respectively.Experimental results show that TPPi can effectively suppress the transesterification; by this

the phase structure of the blend changed and the distribution of the fillers was also influenced.With 1.0 wt% of TPPi loading in PBT/PC (1/1)

the co-continuous phase structure formed and the thermal conductivity of the blend improved effectively.After adding 60 wt% of Al2O3 filler in the blend system with 1.0 wt% TPPi

the thermal conductivity of the composite reached to 0.89 W/(mK)

which improved by 13% than that of the system with no TPPi.