Accordingto the studies related to conductive polymers, polythiophen (PTh) and itsderivatives have desirable properties such as electrical conductivity, highthermal stability and optical properties such as electrochromism, photothermaland photocatalytic properties that have been used in electrical and electronicequipments. In this study PTh was used to produce nanofibers. Modification ofthe conductive polymers such as PTh can increased dramatically the performanceof the polymer. Therefore, in this study, first PTh was modified with inorganicsulfur particles through oxidation-reduction processes during polymerization. Afterwardsnanofibers ofpolymethyl methacrylate (PMMA) were prepared by electrospinning ofhomogeneous solution ofPTh or sulfurmodified polythiophen (S-PTh) and PMMA. FTIRand HNCS test results indicate that the formation of the PTh and S-PTh. Results showed an increase in thermal stability of theS-PTh compare to PTh. It was also observed that PTh and S-PTh have good thephotocatalytic properties to degradation ofmethyleneblue (MB) under visible light irradiation. Based on the test results S-PTh in the presence of an electrolyte has electrochemicaloxidation – reduction capability and can be used in electronic devices. SEMimagesshowed that the PMMA nanofibers diameter was decreased with increasing in PThor S-PTh content due to decrease in polymer solution viscosity and increase insolution conductivity. FTIR spectra of nanofibers obviously showed thecharacteristic absorption peaks related to PMMA and PTh or S-PTh polymericgroups. This showed that there is no chemical linkage or interaction between PMMAand PTh or S-PTh in the resulting nanofibers. XRD results revealed amorphous structure of nanofibers. TGAresults of nanofibers showed that thermal stability of the PMMA increased dueto increasing of PTh or S-PTh in PMMA electrospun nanofibers . Alsolowerthermal degradation rate ofPMMA/S-PTh nanofibers was observed in compare to PMMA/PTh nanofibers.The photocatalyticproperties of nano?bers were evaluated by photocatalytic degradation of MB in waterunder visible light irradiation. It was observed that PMMA, PMMA/PTh andPMMA/S-PTh nano?bers exhibited the most excellent photocatalytic activity.Since the amount of PTh or S-PTh in thenanofibers is negligible with respect to PMMA polymer, no significantdifference in MB degradation was observed. Key words: polythiophen, modifiedpolythiophen, sulfur, poly methyl methacrylate, nanofiber, photocatalysis.
