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)
  • 발행 : 2000.06.01

초록

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.

키워드

참고문헌

  1. J. Chem. Phys v.8 Kinetics of Phase Change Avrami, J. M.
  2. J. Appl. Polym. Sci v.60 Polypropylene during Crystallization from the Melt as a Model for the Rheology of Molten-Filled Polymers Boutahar, K.;C. Carrot;J. Guillet
  3. Macromolecules v.31 Crystallization of Polyolefins from Rheological Measurements-Relation between the Transformed Fraction and the Dynamic Moduli Boutahar, K;C. Carrot;J. Guillet
  4. Polym. Eng. Sci. v.19 Crystallization Studies of Semicrystalline Polymers Under Oscillatory Shear Using the Rheometrics Mechanical Spectrometer Chang, E.;B. Kushner
  5. Proc. Phys. Soc v.B69 The Elastic and Thermo-elastic Properties of Composite Media Kernerm E. H.
  6. Macromolecules v.26 Rheological Mechanism and Overview of Nucleated Crystallization Kinetics Khanna, Y. P.
  7. Makromol. Chem v.185 Influence of Composition, Crystallization Conditions and Melt Phase Structure on Solid Morphology, Kinetics of Crystallization and Thermal Behavior of Binary Polymer/Polymer Blends Martuscelli, E.;M. Pracella;G. D. Volpe;P. Greco
  8. J. Appl. Phys. v.41 Generalized Equation for the Elastic Moduli of Composite Materials Nielsen, L. E.
  9. Mechanical properties of polymers and composites Nielsen, L. E.;R. F. Landel
  10. Rheol. Acta v.29 Linear Rheology of Viscoelastic smulsions with interfacial tension Palierne, J. F.
  11. J. Polym. Sci. v.5 Application of Equivalent Medel Method to Dynamic Rheo-Optical Properties of Crystalline Polymer Takayanagi, M.;S. Unemara;S. Dynamic
  12. Taylor and Francis Application of percolation theory Sahimi, M.
  13. Part: Theory, Polym. Eng. Sci. v.19 Strain-Induced Crystallization Yeh, G. S. Y.;K. Z. Hong