Abstract
The degree of hydration and the water permeability of polyethylene films were enhanced by incorporation of phosphonate pendent groups along the polymer chain. Two different phosphonate esters were considered: the dimethyl ester and an ester derived from poly(ethylene oxide) oligomers (PEO). The highest molecular weight PEO derivatives had the greatest effect on hydration and permeability. A physical change was observed during hydration for the phosphonated materials with a degree of substitution greater than 4.5. The polymers became stiff and brittle, and this was accompanied by an increase in the crystalline melting point and a remarkable change in the dynamic mechanical behavior.
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