Abstract
Saturated solutions of acetylene in water were irradiated for several hours by a 125 W u.v. lamp. Photopolymerization has been followed with u.v.-vis spectroscopy and different polymerization pathways involving diacetylene, vinylacetylene and cumulene formation have been discussed. Solvent evaporation from the resulting milky-white solution of photopolymer in water resulted in isolation of a cream coloured powder of acetylene photopolymer which is insoluble in common solvents. This photopolymer was characterized by means of elemental analysis, Ft-i.r. and u.v. spectroscopy and found to incorporate about 18% of oxygen (probably taken from water) in the form of ketonic, carboxylic, hydroxylic and ether derivatives. Ft-i.r. spectroscopy reveals the structural similarity between the acetylene photopolymer to that of linear polyacetylene, oxidized in air at 150–160°. The thermal oxidation of a linear polyacetylene has been studied by Ft-i.r. and it is also discussed.
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