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PU membranes of known mass were placed into polymerization tubes containing 1.5 mL benzoyl peroxide (BO)¨Cacetone (Merck) solutions of  0.04M.
The polymerization tubes were placed into a water bath at constant temperature (30¨C95¡ãC). After thermal equilibrium was reached a 28.5 mL monomer (Aldrich)¨Cwater solution of 1.5 M concentration was added to the polymerization tubes and polymerization was performed for 3 h.

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