AbstractThe1H NMR spectra of poly(methyl acrylate‐d1) +CHDCH(COOCH3)+nwere measured ino‐dichlorobenzene and CDCl3in the temperature range between − 20 and 145°C. Trans and gauche coupling constant were determined from the temperature dependence of the geminal coupling constants, neglecting g' conformers. It was estimated that the proportion of trans conformer is 1,5 to 1,9 times that of the gauche conformer in this temperatu