The diffusivity and distribution of water in the butyl methacrylate and
methacrylic acid copolymer films swollen in water have been investigated using
the NMR relaxation and pulse field gradient (PFG)
NMR techniques. The contributions of polymer matrix protons, surface water and
bound water have been determined from 1H NMR spectra and relaxation functions. PFG NMR experiments showed that the echo attenuation function depends on the diffusion time indicating that water inside the swollen
film is trapped in restricted confinement. The data obtained have been
discussed using published physical models for diffusion of water in polymeric
materials. The sizes of pores inside the film were estimated using the published
model approaches giving the range of 0.8-1.0 μm. Magnetization decays as well as the spin-spin
relaxation times of water saturated polymer films were also determined in this
study. NMR relaxation provided additional information on the water distribution
in the porous microstructure. The volume-averaged water mobility decreased with
increasing hydrophobic content of the polymers.
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