Electrical property of carbon nanotubes/ polyphenylacetylene composites

Polyphenylacetylene ( PPA) was prepared with anhydrous AlCl₃ as catalyst , and sulfonated by concent rated H₂SO₄ . The conductivities were studied for carbon nanotubes (CNT) / PPA and sulfonated CNT/ PPA composite , which were prepared by mixing CNT with polymer in tet rahydrofuran under sonication. The room temperature conductivity of the two kinds of composites increases with increasing the ratio of CNT. The estimated percolation threshold of sulfonated CNT/ PPA is 1 % less than that of CNT/ PPA and the amount of CNT added to PPA forobtaining the maximum conductivity is 10 % of that of the sulfonated PPA. And the factors that affect the conductivity of the composites were analyzed when the temperature changes. The XRD shows that the sulfonated PPA hascreated a new crystal st ructure on the interface of CNT.