Organotin polymers—III: Copolymerization and terpolymerization of tributyltin acrylate with methyl methacrylate, propyl methacrylate, butyl methacrylate and acrylonitrile

Abstract

Copolymerizations of tri- n-butyltin acrylate (M 1) with (a) methyl methacrylate (M 2), (b) propyl methacrylate (M 3), (c) butyl methacrylate (M 4) and (d) acrylonitrile (M 5) in solution at 70 using AIBN as initiator led to monomer reactivity ratios as follows: (a) r 1 = 0.401 and r 2 = 2.199, (b) 0.323 and 1.713, (c) 0.196 and 1.65, and (d) 0.243 and 1.008. The variation of the average copolymer composition with conversion for two copolymers from M 1 with M 2 and M 4 were calculated and verified experimentally. Four terpolymer compositions involving M 1 and M 5 with M 2 or M 4 were prepared and the terpolymer compositions were calculated on the basis of tin and nitrogen analyses. The variations of instantaneous and average terpolymer composition with conversion fit satisfactorily the experimental results over a wide range of conversion.