ABSORPTION AND FLUORESCENCE-SPECTRA OF PO LY(CYANO-P-XYLYLENE)

The absorption and fluorescence spectra of the films of poly(cyano-p-x ylylene), of the copolymer obtained from cyclodi-p-xylylene and dicyan ocyclodi-p-xylylene as well as of the solutions of the parent compound s were studied. The absorption spectrum of polycyano-p-xylylene in the region 250 - 300 nm possesses a complex band with peaks at 280 and 29 0 nm (epsilon290 = 1600). The fluorescence spectrum consisted of two b ands with maxima at 330 and 370 nm associated with different centers o f emission. The first band is.assigned to the emission by the benzonit rile units of the polymer chain, whereas the second band arises from t he sites due to admixtures. One of them represents the parent cyclic c ompound, traces of which are present in the polymer. Freshly prepared polycyano-p-xylylene film, colored pink, exhibits green fluorescence, the band of which shows maxima at 530 and 560 nm. The fluorescence spe ctrum of the copolymer consists of the band belonging to the benzonitr ile chromophores, and the structural band corresponding to stilbene un its which appear as defects in the macromolecular chain of the polymer .