Relation between molecular weight and intrinsic viscosity for polymethyl methacrylate

Abstract

Abstract The chain lengths of polymethyl methacrylates prepared with ferrous ion–hydrogen peroxide as the initiating system are consistent with the scheme advanced for the mechanism of the polymerization. The relation between intrinsic viscosity in benzene and molecular weight for fractionated polymethyl methacrylate has been determined and leads to the equation: n = 2.81 × 10 3 [η] C 6 H 6 1.32 . This equation agrees very well with the data of Schulz, provided that the correct method of extrapolating the osmotic pressures to zero concentration is used. Using the relationship between [η]C 6 H 6 and [η] CHCl 3 obtained experimentally, the relation between n and [η]CHCl 3 (at 20°C.) is: n = 1.81 l 3 × 10 3 [η] CHCl3 1.22 .