Innovative elastic and flexible conductive composite materials PEDOT:PSS/P(BA-St) and PEDOT:PSS-PBA were prepared by two approaches based on poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS). In the first part, PEDOT:PSS/P(BA-St) was prepared by blending various soft poly(n-butyl acrylate-styrene) (P(BA-St)) latexes into a PEDOT:PSS conductive dispersion. The PEDOT:PSS conductive dispersion was prepared via oxidative polymerization of EDOT, and the soft P(BA-St) latexes were synthesized by emulsion polymerization using various types of surfactants. In the second part, poly(styrenesulfonate) (PSS) served as a surfactant to synthesize poly(styrenesulfonate)-poly(butyl acrylate) (PSS-PBA) soft latex via emulsion polymerization. Then, the PEDOT:PSS-PBA dispersion was prepared by using the PSS-PBA soft latex as a polymeric template to polymerize EDOT. The glass transition temperature (T-g) and particle size of P(BA-St) and PSS-PBA were measured. The optoelectronic properties of the conductive PEDOT:PSS/P(BA-St) and PEDOT:PSS-PBA films such as transmittance, surface resistance, and UV-vis absorbance were investigated. According to the elongation measurement, the fabricated PEDOT:PSS/P(BA-St) elastic film containing a P(BA-St) content as high as 83 wt% showed a high value of 97% elongation, while possessing good film conductivity (63 S cm(-1)) and superior transmittance (93%). On the other hand, the fabricated PEDOT: PSS-PBA flexible film containing 13 wt% PBA showed a low surface resistance increment (R/R-0 < 1.2) after two steps of bending test, while maintaining superior conductivity (300 S cm(-1)) and high light transmittance (>80%).

Electroluminescent (EL) phenomenon has been widely used in the illumination industry such as light emitting diode (LED) and organic light emitting diode (OLED) nowadays. In this research, flexible EL devices were fabricated by using the flexible substrates and conductive polymer poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) dispersions as the anode materials. The PEDOT:PSS dispersion was firstly prepared by oxidative polymerization while PSS was served as a polymeric template. Via introducing poly(vinyl pyrrolidone) (PVP) ethanol solution into the PEDOT:PSS dispersion, viscosity and wetting ability of the mixed PEDOT:PSS/PVP solution were enhanced in the same time. The three formed PEDOT:PSS/PVP thin films on glass substrates presented good conductivity and high transmittance (transmittance >76%). The wetting abilities of these PEDOT:PSS/PVP dispersions on the PET films coated with the low dielectric resin were evaluated from the contact angle measurements. It showed that the contact angle was decreased with increasing the addition of PVP ethanol solution. The different PEDOT:PSS/PVP dispersions were further used as the anode material in the EL flat plates and EL wires by dip coating process. Uniform and smooth conductive thin films with high transmittance were formed on the low dielectric resin layer. The luminance of these EL devices was observed and photographed after connecting to 110V AC power.