Poly arylenevinylene , PAV

Good optical quality thin films of PAV have been prepared through a new precursor polymer that is soluble in organic solvents [16]. For example, PTV thin film can be fabricated as follows. Polymerisation of a sulfonium monomer, 2,5-thienylene bis(methylene-dimethyl-sulfonium chloride), is carried out in a methanol-water mixture 

The optical absorption maxima are revealed to be at 520, 500 and 420 nm for PTV, MOPPV and PPV films, respectively. X-ray diffraction patterns indicate that the PAV films have low crystallinity. The values of these PAV films evaluated by third-harmonic generation (THG) measurement at 1.85 pm are found to be 5.85 x 10 esu, 3.2 X 10 esu, and 7.8 x 10 esu for PTV, MOPPV and PPV films, respectively. These values are non resonant values and are almost the same as that reported for a processible polydiacetylene (n-butoxycarbonylmethyl urethane) (n-BCMU-PDA, n = 4,3) thin film [18]. 

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