Electrochromic device /PMMA

Compared with PEO electrolytes, PDVF, and PMMA electrolytes exhibited higher ionic conductivities. In particular, PMMA has attracted increasing attentions due to its low cost, high solvent retention ability, high transparency, and processibility. The first allpolymer electrochromic device was obtained based on a gel electrolyte and PEDOT-PSS [poly(styrene sulfonate)] electrochromic material (Argun et al., 2003). The fabricated device exhibited a maximum transmittance change of 51% at 540 nm. In addition, this device was fairly stable and only 5% contrast loss was observed after 32,000 cycles. 

Like their analogues, the P(TV)s, the P(PV)s have been studied for use in applications as varied as 3rd-order NLO materials [616] and electrochromic devices [619]. Yang and Geise [359] have prepared a series of P(PV) derivatives using a modified route that yields a mixture of cis/trans configurations which makes the polymers highly soluble in solvents such as CHCI3. Table 14-2 summarizes their properties. Conductive (0.1 to 2 S/cm) films are said to be castable [359] from solutions of these CPs with I2 and a host polymer such as PMMA. 

YANG, D., FU, X., JIANG, Q., GONG, Y., Synthesis of polymer electrolyte based on P(VAc-MA)/PMMA and its application in electrochromic devices. Chemical J. Chinese Universities (in Chinese), 2007,28(9), 1781-6. 

ITC) deposited on flexible, plastic substrates such as PMMA or polycarbonate was used as the conductive electrode substrate, with the active electrochromic electrodes producible as a roll which could be attached to window panes with common (e.g. cyanoacrylate) adhesives. This device again optionally used a counter electrode which was also electrochromic, with the difference that it could be not only a metal oxide such as WO3, but also, interestingly, an n-type CP, which of course displays electrochromism which is complementary to that of the more common p-type CPs. Thus, as cathode materials, the p-type CPs P(ANi) s, P(Py) s and poly(phenylene vinylene) were listed as usable, with virtually all the common dopants. As anode materials, WO3, M0O3, poly(isothianaphthene), and the -type CPs poly(alkoxy-thienylene vinylene) poly(p-phenylene), poly(phenyl quinoline) and poly(acetylene) were listed as usable. Liquid nonaqueous electrolytes based on common solvents such as DMSO and THF were used. No electrochromic data were however given in the patent or in subsequent publications. 

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