
%0 Journal Article
%A Moad, G 
%A Solomon, DH 
%A Spurling, TH 
%A Johns, SR 
%A Willing, RI 
%T Tacticity of Poly(Methyl Methacrylate). Evidence for a Penpenultimate Group Effect in Free-Radical Polymerization
%J Australian Journal of Chemistry
%D 1986/01/01
%V 39
%N 1
%P 43-50
%K 
%R https://doi.org/10.1071/CH9860043
%U https://www.publish.csiro.au/paper/CH9860043 
%X The tacticity of poly(methyl methacrylate ) prepared by free-radical polymerization has been determined by analysing the carbonyl region of the 13C n.m.r . spectrum. This analysis demonstrates that the addition of poly(methyl methacrylyl ) radical to methyl methacrylate in benzene at 60&#176;C is subject to a significant penpenultimate unit effect. The probability of forming a meso dyad is some 20% less if the preceding dyad in the chain is also meso . The polymerization (60&#176;C, benzene) is described by the following parameters P(m) = 0.202, P(m|m) = 0.159, P(r | m) = 0.212. 
