Intrinsic viscosity–molecular weight relation for polymethyl methacrylate: Effect of size distribution

Abstract

Abstract Polymethyl methacrylate samples were prepared by bulk polymerization at 60° initiated by benzoyl peroxide and 2‐azobisisobutyronitrile. Osmotic measurements and intrinsic viscosities were made in chloroform solutions at 20°, using unfractionated polymers of varying number‐average molecular weights. The relation between number‐average degree of polymerization and intrinsic viscosity was obtained and compared with reported relationships for fractionated polymers under the same conditions. Inferences were drawn regarding the size distribution in the unfractionated polymers.