Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 326148
Title Additive Diffusion from LDPE Slabs into Contacting Solvents as a Function of Solvent Absorption
Author(s) Helmroth, I.E.; Dekker, M.; Hankemeier, T.
Source Journal of Applied Polymer Science 90 (2003). - ISSN 0021-8995 - p. 1609 - 1617.
Department(s) Product Design and Quality Management Group
Publication type Refereed Article in a scientific journal
Publication year 2003
Keyword(s) concentration-dependent diffusion - penetrant diffusion - swellable polymers - transport - temperature - polyolefins - permeation - parameters - migration - alcohols
Abstract This article describes the simultaneous diffusion of a migrant and a solvent in low density polyethylene (LDPE). The migrant (Irganox 1076) moves out of the slab, while the solvent (isooctane, n-heptane or cyclohexane) moves inwards. Solvent absorption was measured separately by following the increase of the mass of the slab in time. It can be described by the Fick diffusion equation with a diffusivity depending on the solvent concentration, and an interface concentration depending on time. The final absorptions were 12% for isooctane, 14% for n-heptane, and 29% for cyclohexane. Additive concentrations in the slab were determined at different positions by microtoming. Experiments were done for several Contacting times. The concentration profiles were strongly affected by the solvent. A larger local solvent concentration increases the diffusivity of the migrant. The Fick equation with a migrant diffusivity depending on the solvent concentration gives a good description for the results with isooctane and n-heptane. The description is less good for the measurements with cyclohexane (when the polymer swells strongly). (C) 2003 Wiley Periodicals, Inc.
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