New polymer syntheses. V. Synthesis, characterization, and morphology of new conjugated polymers, copolymers, and terpolymers containing piperidone moiety in main chain

A new interesting category of polyconjugated polymer, poly(3,5-benzylidene) isopropylpiperidone, was obtained by condensation of isopropylpiperidone wi th terephthalaldehyde. Copolymerization and terpolymerization with cyclopen tanone and/or cyclohexanone were also carried out. The model compound was p repared by the condensation of 2 mol benzaldehyde with isopropylpiperidone; the structure was elucidated by IR, H-1-NMR spectra, and elemental analyse s. The polymers, copolymers, and terpolymers were characterized by elementa l analyses, IR, H-1-NMR spectra, UV and visible spectra, viscometry, and X- ray analysis. The thermal behavior of the synthesized polymers was evaluate d by TGA and DSC analyses and correlated with their structures. The morphol ogy of terpolymer TV was examined by a scanning electron microscope. Electr ical conductivities in the 10(-9)-10(-11) Omega(-1) cm(-1) range were obser ved: doping with iodine showed a small increase. (C) 1999 John Wiley & Sons , Inc.