Abstract
We present results of neutron reflectivity measurements of plasticiser diffusion into high molecular weight deuterated poly(methyl methacrylate) (dPMMA). These measurements were made in situ and in real time, enabling the interfacial profile to be studied in detail in situations where the normal ‘anneal–quench’ procedure is impossible. From the velocity of the diffusion front, the diffusion coefficients for two molecular weights of oligo-methyl methacrylate (OMMA) have been determined. Oligo-poly(ethylene glycol) (PEG) diffusing into dPMMA has also been measured and limited solubility of PEG observed.
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