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Table 1 Results of the sulfonation experiments expressed in terms of the number of milliequivalents of ~SO 3 H groups per gram of sulfonated polymer

From: Analysis of recycled poly (styrene-co-butadiene) sulfonation: a new approach in solid catalysts for biodiesel production

Temperature time 30°C 70°C 110°C
1 h 0.42 ± 0.01 4.30 ± 0.17 2.66 ± 0.15
3 h 1.23 ± 0.06 5.13 ± 0.21 2.40 ± 0.20
5 h 0.82 ± 0.03 3.83 ± 0.12 N/A