The polymer based conductive composites has developed as a novel functional composite material recently .The gas sensitive responsive mechanism of polymer based conductive composites doped with carbon black (CB)are discussed in the present paper

such as volume expanding model

crystalline model and hydrogen-bond model .At the same time

we discuss the influence of various factors

such as percolation value

structure and properties of CB and polymers

and interaction among CB

polymer and organic odor etc on gas sensitive responsiveness of the composites .