Abstract: CompositesSulfonated Polyphenylacetylene/Multiwalled Carbon Nanotube（SPPA/MWNT）were prepared by mixing SPPA with MWNT under ultrasonic bath. The composites were studied using Fourprobe, X-Ray photoelectron Spectroscope, UV-Vis-NIR spectrophotometer, X-Ray diffraction, Field Emission Scanning Electron Microscope (FESEM) ,etc. The results show strong interactions between MWNT and SPPA as well as a behavior of
Negative Temperature Coefficient (NTC) of resistance. The phenomenon of
the low percolation threshold and twice obvious increases of electrical
conductivity were also found in the composites. It is assumed that SPPA with
higher electrical conductivity due to charge transfer between SPPA and MWNT，which were affected by interaction, contacts with each other. Thus it forms
conductive networks in the composites.

Key words: MWNT, interaction, electrical conductivity, SPPA, MWNT, interaction, electrical conductivity