Korea-Australia Rheology Journal

The Korean Society of Rheology (한국유변학회)
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Thermal behavior and rheology of polypropylene and its blends with poly($\varepsilon$-caprolactone)

  • Chun, Yong-Sung (Department of Chemical Engineering, Center for Advanced Functional Polymers Korea University) ;
  • Minsoo Han (Department of Chemical Engineering, Center for Advanced Functional Polymers Korea University) ;
  • Park, Junghoon (Department of Chemical Engineering, Center for Advanced Functional Polymers Korea University) ;
  • Kim, Woo-Nyon (Department of Chemical Engineering, Center for Advanced Functional Polymers Korea University)
  • Published : 2000.06.01
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Abstract

The crystallization behavior of homo polypropylene (PP) and PP in the PP-poly($\varepsilon$-caprolactone) (PCL) blends during isothermal crystallization has been investigated using differential scanning calorimeter (DSC) and advanced rheometric expansion system (ARES). From the storage modulus data of the homo PP and PP-PCL blends during isothermal crystallization, the volume fraction of crystallized material ($X_t$) of the homo PP and PP in the PP-PCL blends was calculated using the various rheological models. The results of $X_t$ of the homo PP and PP in the PP-PCL blends from ARES measurement were compared with the results from DSC. The $X_t$ of the homo PP was found to be higher in the ARES measurement than in the DSC. The crystallization rate of the homo PP was found to be faster in the rheological measurements than in the thermal analysis. The $X_t$ of PP in the PP-PCL blends with various compositions was obtained from the thermal analysis and rheological measurements. The $X_t$ of PP in the PP-PCL blends obtained from the thermal analysis and rheological measurements are not consistent. This discrepancy of $X_t$ may be due to the morphological changes resulted from the different crystallization kinetics of PP in the PP-PCL blends.

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