Study On Preparation And Performances Of Sulfonic Acids Doping Coal-based Polyaniline And Its Blends

The blend of Coal-based Polyaniline(CBP) and current polymer is a effective approach of polyaniline(PAn) application. Adopting organic functional sulfonic acids to dope and modify CBP, the conductivity of CBP can be enhanced, at the same time, thermal stability,processing,compatibility with resin,environmental amity nature are also improved. CBP-DBSA was prepared successfully by the means of emulsion polymerization in-situ doped; moreover, in virtue of FTIR,XRD,TG and SEM testing measures, configuration and performances of CBP in different forms were researched. The results indicate: velocity of whisk 2000r/min, adding velocity of APS 1.1mmolAPS/min, coal/An mass ratio 7.75g/5mlAn, polymerization temperature 15℃, polymerization time 24h, An monomer concentration 0.36mol/l, pH value of filtrate 3, n(APS)∶n(An)=1.2,n(DBSA)∶n(An)=1.0, conductivity of CBP-DBSA in-situ doped is up to 0.954S/cm. Under 260℃, thermal stability of CBP-DBSA is better than CBP without added acids. Research of CBP doping-dedoping course prove: added acids introduced by in-situ polymerization and acidic groups(-COOH,-OH) in the surface of coal play cooperating doped action on PAn; Course of CBP doping(HCl,DBSA) and dedoping(NH3·H₂O,NaOH) is incompleted reversible. Polymer/CBP-DBSA composites were prepared successfully by melting processing. By mensuration of conductivity and mechanics performance, analysis of FTIR and TG, and SEM observation of stretching section, configuration and performances of composites were researched. The results show: current polymer and CBP-DBSA can be blended, and electricity performance of matrix resin is enhanced; be compared to LDPE, hydrogen bond action between EVA and CBP-DBSA can improve interface compatibility of two phases, EVA is a kind of better matching matrix, EVA and CBP-DBSA can be blended to prepare anti-static composites. With increase of CBP-DBSA content, mechanics performance of composites are gradually declined, but conductivity present rised trend and have lower conductive threshold: EVA/CBP-DBSA 7%, LDPE/CBP-DBSA 13%; When CBP-DBSA content are same, conductivity of EVA/CBP-DBSA are higher above 2⁵ magnitude than of LDPE/CBP-DBSA, and mechanics performance of EVA/CBP-DBSA are also preferable. When mass fraction of CBP-DBSA is 13%, tensile strength of EVA/CBP-DBSA is 21.49MPa, elongation at break 287.73%, conductivity 4.78×10-9 S/cm, composite has anti-static function, and its environmental stability is better.