Abstract: Polyamide 66/thermotropic liquid crystalline polymer/halloysite nanotubes (PA66/TLCP/HNTs) Insitu hybrid composites were prepared by means of melt blending. The thermal conductivity mechanism, flameretardant properties as well as the morphologies of the composites were investigated. The thermal conductivity properties and limited oxygen index were improved as the amount of HNTs increased and a thermal conductive net was formed at a HNTs content of 30 wt %, in which HNTs and TLCP dispersed well in PA66 matrix. When the content of HNTs increased to 40 wt %, the thermal diffusivity, thermal conductivity, and limited oxygen index were increased by 27 %, 134 %, and 42 %, respectively.

Key words: polyamide 66, thermotropic liquid crystalline polymer, halloysite nanotubes, insitu composite, thermal conductivity mechanism, flameretardant property