Narrow fractions of linear polystyrene were added to cyclic polystyrenes of similar molecular weights. For weight concentrations, phi //c, of the cyclic polymers from 0. 85 to 1. 0 it is found that the shear viscosity can be represented by a power law in the concentration with an exponent of approximately minus 5. 6, i. e. eta //0 alpha phi //c** minus **5**. **6. These results suggest that discrepancies between reports in the literature for the molecular weight dependence of the melt viscosity of cyclic polymers can only be partly accounted for by contamination of the rings with linear chains.
|Number of pages||3|
|Journal||Polymer communications Guildford|
|State||Published - Oct 1986|