A new copolymerization equation is suggested for the calculation of co
polymer composition. The new equation is independent of reactivity rat
ios, so we can obtain the copolymer composition from experimental data
when the reactivity ratios are unknown. The new equation has been ver
ified by experimental data (styrene/methyl methacrylate, methyl methac
rylate/vinyl chloride, and styrene/acrylonitrile systems). The results
of the comparisons suggest that the new equation is satisfactory. (C)
1995 John Wiley and Sons, Inc.