Study On The Preparation And Properties Of Polymer-matrix Polyaniline Composites

This paper respectively used dodecylbenzene sulfonic acid or hydrochloric acid asdoping agent, polyaniline with nanofiber structure or polymer-matrix conductive compositeswere prepared by different methods. The chemical structure, electrical conductivity andparicle size distribution of doped polyaniline were characterized using FT-IR, digital fourprobe teater and laser particle analyzer. The change of composites’ thermal performance alongwith different conductive component content was studied using TGA, DSC and DMA. Themechanical property and appearance characteristics of brittle fracture of polymer-matrixconductive composites were observed and analyzed using material testing machine andscanning electron microscopy.Conductive polyaniline(PANI) was synthesized by chemical oxidative copolymerization,using dodecylbenzene sulfonic acid (DBSA)as doping agent. PANI-DBSA/ABS conductivefilms were obtained by solution blending method, using chloroform as organic solvents. Theresults indicate that PANI-DBSA had good solubility because dodecylbenzene sulfonic acid(DBSA) played a good doping role in polyaniline. Composite films’ electric conductivityimproved with the increasing content of PANI and the percolation threshold was about10wt%when conducting network formed. TGA curves demonstrate that product’s glass transitiontemperature was much higher than acrylonitrile-butadiene-styrene resin, furthermore, thethermal stability of composite films also improved when compared with polyaniline or resin.Under the circumstances of using different organic solvent, polyaniline with nanofiberstructure which had uniform morphology and high electric conductivity was synthesized. Thedifferent preparation conditions including APS concentration, reaction time, anilineconcentration, temperature and organic solvent kinds were investigated to discuss theinfluence of these conditions on the morphology and conductivity of the resultingsamples.Choosing the best preparation process conditions according to the above conclusion.Through theoretical analysis and conculsion, choosing appropriate process parametersmeeting the technological requirements. The electroconductive plastic was prepared by meltblending using graphite or doped polyaniline as conductive filler, ABS resin as matrixpolymer. And we also researched the relationship between mechanical or electrical propertiesand the content of conductive fillers. Compared with graphite, the electroconductive plastic basically kept the glass transition temperature, tensile strength and storage modulus of ABSresin polymer. Polyaniline with nanofiber structure dispersed uniformity, forming conductivenetwork of certain area, improving the conductive performance of polymer-matrix compositeeffectively.The polymer-matrix conductive composite samples we have prepared have lowerpercolation threshold and better mechanical property. The molding process parameters aresimple and the raw materials have low cost.Their electrical and mechanical property could beadjusted in large scale according to the requirement. Due to these, the composites have broadapplication prospects.