Abstract
AbstractA steady‐state fluorescence (SSF) technique was used for studying the dissolution of UV‐cured polymer films. These films are formed from poly(methyl methacrylate) (PMMA) chains labelled with pyrene, which was introduced as a fluorescence probe to monitor the dissolution processes. The PMMA films of various ethylene glycol dimethacrylate (EGDM) contents, cured by ultraviolet (UV) radiation, were dissolved in chloroform–heptane (20 : 80, v/v) mixtures. Dissolution of the films was monitored in real‐time by the change in pyrene fluorescence intensity, IP, in the solvent mixture. It was observed that the maximum pyrene intensity, IP∞, increased above a critical EGDM content, which was attributed to the formation of a percolation cluster, i.e. UV‐cured films hardly dissolve above this critical EGDM content in the film. Desorption rates, Dd, were measured for films prepared with various EGDM contents. Copyright © 2002 John Wiley & Sons, Ltd.
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