SUBLIMATION DESORPTION OF DYE FROM FILM ROLL

A roll of nylon 6 film dyed with p-aminoazobenzene (PAAB) was heated at 120°C in a vacuum (5×10-3 Torr) for 10_??_20 hrs and from the concentration distribution of PAAB obtained, diffusion coefficient D of the dye in nylon in the absence of water was calculated by means of Sekido and Matsui1) (M method).D was also determined by measuring the rate of sublimation from a single layer of the dyed nylon film (S method).From these results following conclusions were obtained:(1) When the specimen was dyed so long that the dye concentration attained equilibrium value, D values from both methods were in good accordance.(2) Even when the dyeing was not attained the equilibrium, the D value obtained by M method was equal to that obtained in (1).