| Abstract: | The effective viscosity of an isotactic polypropylene (IPP) melt during processing and aging has been investigated together with the changes in the mechanical properties of stabilized IPP during aging. In the presence of polymeric antixoidants there is an increase in the effective viscosity of the IPP melt attributable to interaction with the degraded IPP molecules. During the aging of IPP articles the characteristic properties of polymeric antioxidants associated with their high molecular weight are not especially in evidence.Moscow Lomonosov Institute of Fine Chemical Technology. Translated from Mekhanika Polimerov, No. 5, pp. 938–941, September–October, 1970. |
