Preparation of cross linked PVA with MA,EDTA,and a mixture of MA/EDTA for water uptake membranes at different pH

الملخص

Poly (viny1 alcohol) (PVA) of 72000 g mol -1 molar mass was cross linked through cold cast esterification with different mol % of MA and EDTA (10 % , 20 % and 30 % ), and two different mol % mixture of MA l EDTA (20 %/5% and 20%/10% .
Molecular structures of the produced membranes were identified by FTIR spectral analysis .
Mechanical measurements showed that, PVA cross linked with 30 mol% EDTA gave higher tensile strength value, while PVA cross linked with 30mol% MA gave higher elongation value at break.
Water swollen of the membranes was studied at ambient conditions and different pH solutions (4, 5, 6, and7) .
Water swollen of the membranes was studied at ambient conditions and different pH solutions (4, 5, 6, and7) .
Maximum swelling percent (Sw%) value at equilibrium was at pH7 for all membranes and this value decreases as pH was decreased.
Relation between maximum Sw% and the cross link density (c) was obtained mathematically to prove that the decrease in Sw% is due to the increase in c.