Abstract
AbstractThe intrinsic viscosity [η]‐weight average molecular weight Mw, relation has been studied for fractions of a range of vinyl chloride homopolymers prepared at 40–80°C in aqueous suspension. In addition to curvature of the log [η]‐log Mw plots for Mw > 2 × 105, at constant Mw a slight but definite trend to lower [η] as polymerization temperature is increased was also observed. Both these effects are ascribed to long chain branching due to an increasing incidence of intermolecular chain transfer as polymerization temperature is increased. Limited examination of poly(vinyl chloride) prepared by emulsion polymerization indicates, by the same criterion, a greater incidence of branching than found in poly(vinyl chloride) prepared at the same temperature by the aqueous suspension process. It is concluded that no single correlation of the Mark‐Houwink type can be expected to apply to vinyl chloride homopolymers prepared over a range of conditions.
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