Study of carbon nanotube/epoxy composite films for high thermal conductivity and flexible modification

Carbon nanotube arrays were fabricated via floating catalyst chemical vapor deposition(CVD), with diameter about 80 nm and height of 400~500 μm. Epoxy was designed to composite with carbon nanotube arrays for preparing CNTAs/epoxy composite films. Further, DBP as a toughen agent was added into epoxy polymer before compositing in order to make CNTAs/epoxy composite films infiltrated better, less space and more flexibility. When DBP weight percent was 10%, the thermal conductivity of CNTAs/epoxy composite films was 12.5 W/(m·K), and with DBP percent increased, the thermal conductivity and electric properties decreased because of its low thermal conductivity and density. 20% of DBP was a turning point that has the best ductility.