Effect of nucleating agent on the structure development in isotactic polypropylene/liquid paraffin mixture

  • Okada T
  • Saito H
  • Yamazaki M
 et al. 
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Abstract

We investigated the crystallization behaviour in an isotactic polypropylene (PP)/liquid paraffin (LP) mixture loaded with a small amount of nucleating agent (NA) under a microscope. Three types of crystallization behaviour were observed, depending on the crystallization temperature and the composition: (1) connected nucleation (CN)-type crystallization which yields a unique network structure consisting of interconnected PP crystals; (2) aggregated nucleation (AN)-type crystallization; and (3) the familiar spherulitic crystallization. The CN and AN types were never observed in binary mixtures of PP/LP and PP/NA. In contrast, the NA/LP mixture developed a network structure consisting of highly interconnected axialite-like crystals of NA. The crystallization mechanism in the ternary mixture (PP/LP/NA) was found to be controlled by the competitive kinetics of the NA crystallization versus that of PP; e.g., the network structure is created when NA crystallization occurs and then small PP crystals grow densely along the fibrils in the axialite NA crystals. © 1990.

Author-supplied keywords

  • competitive kinetics
  • crystallization
  • gelation
  • liquid paraffin
  • network structure
  • nucleating agent
  • polypropylene
  • ternary mixture

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Authors

  • Tetsuo Okada

  • Hiromu Saito

  • Manabu Yamazaki

  • Takashi Inoue

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