Effect of Shear Flow on Crystallization of Sydiotactic Polypropylene/Clay Composites


  • N. Ahmad Department of Chemical and Material Engineering, College of Engineering, Northern Border University, Saudi Arabia
  • E. Fouad Department of Chemical and Material Engineering, College of Engineering, Northern Border University, Saudi Arabia
  • F. Ahmad Department of Chemical and Material Engineering, College of Engineering, Northern Border University, Saudi Arabia
Volume: 8 | Issue: 4 | Pages: 3108-3112 | August 2018 | https://doi.org/10.48084/etasr.2079


The high sensitivity of crystallization to shear flow is a subject of great research interest the last several years. A set of syndiotactic polypropylene/clay composite samples were used to examine the effect of shear flow on crystallization kinetics. This phenomenon alters both processing and material final properties. In the present work, the effects of clay contents and shear flow on the rate of flow induced crystallization were investigated using rheological technique. Small amplitude oscillatory shear experiments were performed using advanced rheometric expansion system (ARES). The crystallization rate is found to alter by both shear and clay contents in the polymer composites.


shear flow, flow induced crystallization, syndiotactic polypropylene/clay composites, induction time, Deborah number, crystallization kinetics


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H. Janeschitz-Kriegl, E. Ratajski, M. Stadlbauer, “Flow as an effective promotor of nucleation in polymer melts: A quantitative evaluation”, Rheological Acta, Vol. 42, No. 4, pp. 355–364, 2003 DOI: https://doi.org/10.1007/s00397-002-0247-x

R. H. Somani, L. Yang, B. S. Hsiao, T. Sun, N. V. Pogodina, A. Lustiger, “Shear-induced molecular orientation and crystallization in isotactic polypropylene: Effects of the deformation rate and strain”, Macromolecules, Vol. 38, No. 4, pp. 1244–1255, 2005 DOI: https://doi.org/10.1021/ma048285d

R. H. Somani, L. Yang, L. Zhu, B. S. Hsiao, “Flow-induced shish-kebab precursor structures in entangled polymer melts”, Polymer, Vol. 46, No. 20, pp. 8587–8623, 2005 DOI: https://doi.org/10.1016/j.polymer.2005.06.034

E. W. Fischer, M. Stamm, M. Dettenmair, “Organization of the Macromolecules in the condensed Phase”, in: Faraday Discussions of the Royal Society of Chemistry, Vol. 68, 1980 DOI: https://doi.org/10.1039/dc9796800026

J. Stejny, J. Dlugosz, A. Keller, “Electron microscope diffraction characterization of the fibrous structure of poly (sulphur nitride) crystals”, Journal of Materials Science, Vol. 14, No. 6, pp. 1291–1300, 1979 DOI: https://doi.org/10.1007/BF00549300

S. T. Milner, T. C. B. Mc Leish, “Reptation and contour-length fluctuations in melts of linear polymers”, Physical Review Letters, Vol. 81, No. 3, pp. 725–728, 1998 DOI: https://doi.org/10.1103/PhysRevLett.81.725

J. I. Lauritzen Jr, J. D. Hoffman, “Formation of polymer crystals with folded chains from dilute solution”, The Journal of Chemical Physics, Vol. 31, No. 6, pp. 1680–1681, 1959 DOI: https://doi.org/10.1063/1.1730678

S. Acierno, N. Grizzuti, H. H. Winter, “Effects of Molecular Weight on the Isothermal Crystallization of Poly(1-butene)”, Macromolecules, Vol. 35, No. 13, pp. 5043–5048, 2002 DOI: https://doi.org/10.1021/ma0200423

S. Acierno, N. Grizzuti, “Flow-induced crystallization of polymer: theory and experiments”, International Journal of Material Forming, Vol. 1, pp. 583–586, 2008 DOI: https://doi.org/10.1007/s12289-008-0323-6

C. Duplay, B. Monasse, J. M. Haudin, J. L. Costa, “Shear-induced crystallization of polypropylene: Influence of molecular weight”, Journal of Materials Science, Vol. 35, No. 24, pp. 6093–6103, 2000

S. Vleeshouwers, H. E. H. Meijer, “A rheological study of shear induced crystallization”, Rheological Acta, Vol. 35, No. 5, pp. 391–399, 1996 DOI: https://doi.org/10.1007/BF00368990

M. Khalil, P. Hebraud, A. Mcheik, H. Mortada, H. Lakiss, T. Hamieh, “Elongational flow-induced crystallization in polypropylene/talc nanocomposites”, Physics Procedia, Vol. 55, pp. 259–264, 2014 DOI: https://doi.org/10.1016/j.phpro.2014.07.074

L. Zhang, Y. Qin, G. Zheng, K. Dai, C. Liu, X. Yan, J. Guo, C. Shen, Z. Guo, “Interfacial crystallization and mechanical property of isotactic polypropylene based single-polymer composites”, Polymer (UK), Vol. 90, pp. 18–25, 2016 DOI: https://doi.org/10.1016/j.polymer.2016.02.052

F. Hernandez Sanchez, L. F. del Castillo, R. Vera-Graziano, “Isothermal crystallization kinetics of polypropylene by differential scanning calorimetry, I. Experimental conditions”, Journal of Applied Polymer Science, Vol. 92, pp. 970-978, 2004 DOI: https://doi.org/10.1002/app.20033


How to Cite

N. Ahmad, E. Fouad, and F. Ahmad, “Effect of Shear Flow on Crystallization of Sydiotactic Polypropylene/Clay Composites”, Eng. Technol. Appl. Sci. Res., vol. 8, no. 4, pp. 3108–3112, Aug. 2018.


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