Premium
The Absorption of Saturated Azobenzene Vapour by Cellulose Acetate
Author(s) -
Jones F.
Publication year - 1961
Publication title -
journal of the society of dyers and colourists
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.297
H-Index - 49
eISSN - 1478-4408
pISSN - 0037-9859
DOI - 10.1111/j.1478-4408.1961.tb02425.x
Subject(s) - cellulose acetate , diffusion , absorption (acoustics) , azobenzene , chemistry , fick's laws of diffusion , activation energy , analytical chemistry (journal) , saturation (graph theory) , cellulose , diffusion process , vapor pressure , aqueous solution , polymer , materials science , thermodynamics , organic chemistry , knowledge management , physics , mathematics , innovation diffusion , combinatorics , computer science , composite material
The rates of absorption of saturated azobenzene vapour by cellulose acetate film have been measured over a range of temperatures by means of a completely enclosed silica spring balance. The results indicate that diffusion is “anomalous” or non‐Fickian below the upper second‐order transition temperature (120°C) of cellulose acetate. Apparent diffusion coefficients were found to vary with concentration, and the activation energy of diffusion increased to a constant value of +31·0 kcal/mole as the concentration of azobenzene in the film increased. This variation of the apparent diffusion coefficient is attributed in part to the energy required for “hole” formation in the polymer and in part to the increased mean free path of the diffusion species. Saturation values in the cellulose acetate were higher than those obtained by conventional dyeing methods, and it is concluded that the process of vapour‐phase absorption differs fundamentally from the process of absorption from aqueous systems.