High-Molecular Compounds (Selected Articles).

Bands have been observed in the area of 1,500-1,700cm in the IR-spectrum of polymethylmethacrylate PMMA. The intensity and form of these bands is attributed to the crystallinity of the samples. We checked the measurements on a large series of PMMA samples, the behavior and block form of which, as determined by the nuclear magnetic resonance NMR spectra, are significantly different from one another. We took the IR-spectrum for each sample of a film which was obtained from a 2 solution of CHC13, a spectrum from the same film after swelling it for 16 hours in 4-heptanone dipropyl ketone, and, finally, a spectrum of the same film after thermostatic control at 120 for two hours. After such processing, we observed the sharp bands in the IR-spectrum contained a broad weak band in the area of 1,550-1,650cm. Russian Translations.