ISSN:
0021-8995
Keywords:
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
,
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
,
Physics
Notes:
The sorption kinetics of p-nitrophenol (PNP) onto undrawn nylon yarn from an organic, nonswelling solvent in a dye bath in which the concentration of PNP was being depleted were found to obey Hill's solution of the diffusion equation, suggesting the presence of a monolayer of absorbed PNP at the surface of the fiber. Diffusion coefficients were obtained using a nonlinear least-squares curve-fitting computer program. For undrawn nylon samples, oxidized for various lengths of time prior to dyeing, the diffusion coefficient increased as a function of oxidation time, rising particularly rapidly once the fibers developed microscopically visible surface cracks. The dependence of diffusion coefficient on oxidation time implies that oxidative degradation of the material is accompanied by formation of submicroscopic incipient cracks, permeable by PNP, of which at least some eventually develop into visible cracks after sufficient oxidation.
Additional Material:
2 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/app.1974.070181218
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