A method of preparing a lass of PPV derivatives includes preparing a soluble precursor of a PPV derivative and converting the soluble precursor to a PPV derivative. The converting includes performing either a thermal treatment in a range of temperatures from approximately 25.degree. C. to 400.degree....http://www.google.de/patents/US5473047?utm_source=gb-gplus-sharePatent US5473047 - Soluble precursor to poly (cyanoterephthalydene) and method of preparation
