u00b0 c psig kpa hr parts sulfonation______________________________________1 70 20 238 0 5 80 932 70 25 272 2 80 953 80 10 169 0 5 40 914 80 14 196 1 40 965 80 24 265 1 40 966 90 45 410 2 160 977 90 35 341 2 80 978 90 18 224 0 5 80 979 90 10 169 1 50 9710 90 24 265 1 40 9711 90 20 238 1 40 9712 90 10 169 1 40 9713 90 30 306 1 5 40 9714 90 18 224 1 5 40 9715 90 22 251 0 5 40 9716 90 17 217 0 5 30 9517 90 14 196 0 5 20 9118 90 11 176 0 5 10 8019 95 24 265 1 40 9720 100 45 410 1 40 9721 100 25 272 1 40 9722 100 10 169 0 5 40 97______________________________________ the procedure of example 1 was repeated using an 8 percent dvb copolymer of styrene and from 30 to 40 parts mecl 2 as the swelling solvent the theoretical dwc was 5 34 meq g the results are summarized in table ii table ii______________________________________pressure sulfonation data for 8 percentdvb copolymer of styrenerun temp p sub max time mecl sub 2 percentno u00b0 c psig kpa hr parts sulfonation______________________________________1 90 20 238 1 40 992 90 20 238 0 5 40 983 90 10 169 2 40 994 90.