Abstract
The property of diacylhydrazine (DHZ) as a crystal nucleating agent for polypropylene (PP) was studied by differential scanning calorimeter (DSC) by measuring the effect of additives on the crystallization temperature (Tc) of PP. Aromatic, aliphatic and mixed-type DHZ were synthesized and used as an additive. The nucleating activity of a DHZ was defined as the rise in Tc by its addition. From the Tc values observed, the eighteen DHZ's studied were classified into three groups;
(a) DHZ's with thermally stable activity, (b) inactive DHZ's, and (c) DHZ's with thermally unstable activity.
