The composites were prepared by solution blending method using PVB as substrate and carbon nano-tubes and boron nitride as fillers.Artificial ultraviolet irradiation experiments were carried out based on three influencing factors:wavelength range,irradiation time and irradiation intensity.The thermal diffusivity of the composites at different wavelengths,irradiation times and irradiation intensities was measured by transient elec-trocalorimetric technique.The results show that the boron nitride/carbon nanotube/poly(vinyl butyral)com-posites are more sensitive to the light rays at a wavelength of 340 nm,and with the increase of irradiation time or intensity,the internal structure of the material will be fractured and degraded,resulting in a continuous de-crease in its thermal diffusivity.
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