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Semicrystalline Poly(vinylidene fluoride)(PVDF) was melt blended by multiwalled carbon nanotube (MWNT) at various contents (0.01 $ 5 wt%) using internal mixer. The relationships between morphology and physical properties based on PVDF and MWNT were investigated. As the MWNT content is increased, the apparent supercooling required for PVDF crystallization and the size of spherulites in PVDF decrease. In the WAXD profiles, the incorporation of MWNT produced a large shoulder at 2u ¼ 20.78 with increasing the MWNT content, corresponding to the polar b-form crystal of PVDF. The experimental percolation threshold for the electrical conductivity in PVDF was estimated and clearly occured between 2 and 2.5 wt%. Similar tendency was also observed in thermal conductivity and permittivity.

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Self-dopable poly(aniline) derivatives gave reversible color change in an all solid state electrochromic window assembled from an electrochromic poly(aniline-Nbutylsulfonate) and an ion conducting polymer electrolyte membrane. Ion conducting polymer electrolyte membranes were prepared by radiation curing of unsaturated PEG acrylates or a sol-gel process using PEG modified triethoxysilane. The solid polymer electrolyte membrane showed high ionic conductivities (4 x 10-4S/cm) at 30°C. The all solid state electrochromic window responded to a potential step from +2.3-1.5V to -1.5 -0.5V by turning its color from green-blue to transparent yellow within 60 s. Color contrast and optical reponse of poly(aniline-N-butylsulfonate)s in contact to different polymer electrolyte systems were a function of electrolyte composition.