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Electrical property of carbon nanotubes/polyphenylacetylene composites

LI Xiangmei~1,XU Xuecheng~(*1),YU Wei~(2,3),GU Yingjun~2, SHI Yan~1,CHENG Rongming~1,CHEN Yiwei~1 (1.Center of Functional Nanomaterials and Devices,East China Normal University,Shanghai 200062,China;2.Department of Physics of East China University of Science and Technology,Shanghai 200237,China;3.Department of Physics of East China University of Science and Technology,Key Laboratory for Ultrafine Materials of Ministry of Education,Shanghai 200237, China)  
Polyphenylacetylene(PPA) was prepared with anhydrous AlCl_3 as catalyst,and sulfonated by concentrated H_2SO_4.The conductivities were studied for carbon nanotubes(CNT)/PPA and sulfonated CNT/PPA composite,which were prepared by mixing CNT with polymer in tetrahydrofuran 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 for obtaining the maximum conductivity is 10% of that of the sulfonated PPA.And the factors that affect the conduc-(tivity) of the composites were analyzed when the temperature changes. The XRD shows that the sulfonated PPA has created a new crystal structure on the interface of CNT.
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