Synthesis of Polydiacetylene-Based Ladder Polymer
A novel polydiacetylene (PDA) was prepared from the monomer having two butadiyne parts linked by a chain of methylene units. Polymerization is solid state was performed by UV or γ-ray irradiation. From 13C NMR spectra measured using CP/MAS technique, the structure of the ladder polymer composed of two PDAs linked by methylene chains was confirmed. By X-ray diffraction experiment, crystallinity was found to be preserved even for the ladder polymer.