Study on electrical property of polyphenylacetylene/carbon nanotubes composites

Polyphenylacetylene(PPA) has been prepared with anhydrous AlCl_3 as catalyst,and sulfonated by concentrated H_2SO_4.The conductivity of PPA/Carbon nanotubes(CNTs) and sulfonated PPA/CNTs composites is studied,which are prepared by blending CNTs with polymer in tetrahydrofuran under sonication.The result indicates that the conductivity of the sulfonated PPA has increased by 3 orders of magnitudes compared to PPA;and that the conductivity of the two kinds of composites is enhanced with the content of CNTs increasing under the room temperature;and that the estimated percolation threshold of PPA/CNTs is 3%,which of sulfonated PPA/CNTs is 2%;and that the amount of CNTs that are added to PPA for obtaining the maximum conductivity is 25%,which of sulfonated PPA/CNTs is 2.5%.The conductive factors of the composites has been analyzed when the temperature changes.