6 236 98 56c 100 00 22 9 0 00 0 234 20 66______________________________________ table ii______________________________________physical properties tensile strength elongationpolymer psi mpa mw______________________________________1 2 535 17 5 940 178 0002 1 420 9 7 600 230 000a 2 125 14 7 335 136 000b 800 5 5 170 54 300c 700 4 9 265 50 700______________________________________ this example demonstrates the ability of the present copolymers to provide a high rate of release of benzyl alcohol from an aqueous solution confined in a container covered with a film of the copolymer into the atmosphere surrounding the container fisher payne permeability cups were used to determine the rate at which benzyl alcohol was released from a 3 by weight solution of this compound in water about 10 cc of this solution were placed in the cup after which a disk cut from a film of the copolymer to be evaluated was placed over the cup flange and secured in position by means of clamps under sufficient pressure to ensure a tight seal when the cup was inverted the transmission rates through the films were determined using a procedure similar to the one described in test method e 96 80 published by the.