Crystallization behavior and rheological properties of polycarbonate and polypropylene blends

Yong Sung Chun, Hyun Chul Jung, Min Soo Han, Woo Nyon Kim

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19 Citations (Scopus)


Crystallization behavior and rheological properties of blends of bisphenol-A polycarbonate (PC) and polypropylene (PP) prepared by screw extrusion have been investigated by differential scanning calorimetry (DSC), polarized-light microscopy, scanning electron microscopy, and a Rheometrics Mechanical Spectrometer. In the study of thermal analysis of PC-PP blends by DSC, double crystallization peaks were observed in the PC-rich compositions. In the study of spherulite of 7/3 PC-PP blend, large droplets (>25 μm) of PP were crystallized between 115 °C and 105 °C, and then small droplets (<10 μm) of PP were crystallized at about 90 °C. This result is consistent with the double crystallization behavior such that heterogeneous and homogeneous nucleations have been observed at about 105 °C and about 85 °C, respectively, by DSC measurements. From the results of rheological properties of the PC-PP blends, the storage modulus of the PC-PP blends at low frequencies has larger value than that of the simple mixing rule. The elasticity increase from the simple mixing rule is consistent with the emulsion model for a dispersed system.

Original languageEnglish
Pages (from-to)2304-2312
Number of pages9
JournalPolymer Engineering and Science
Issue number11
Publication statusPublished - 1999 Jan 1


ASJC Scopus subject areas

  • Chemistry(all)
  • Polymers and Plastics
  • Materials Chemistry

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