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Molecular modeling of matrix chain deformation in nanofiber filled composites

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Abstract

The effects of the oriented fiber filler particles on the microscopic properties of the matrix network chains were investigated by using nanofiber filler particles as reinforcing material. Monte Carlo Rotational Isomeric State simulations were carried out for filled poly(ethylene) (PE) networks to study the dependence of the conformational distribution functions of polymer chains and their elastomeric properties on filler loadings. We were especially interested how the excluded volume effect of the nanofiber particles and their orientation (specifically orientational anisotropy) in the matrix influence elastomeric properties of the network. Distribution functions of the end-to-end distances of polymer chains for both unfilled and filled networks were calculated. Effects of nanofiber reinforcements with varying fiber radii and fiber volume fractions were investigated. We have found that the presence of nanofibers significantly increase the non-Gaussian behavior of polymer chains in the composite. The anisotropic effects of the nanofibers on mechanical properties of polymeric composites were studied as a function of their relative orientation to the direction of deformation. The modulus (reduced nominal stress per unit strain) was calculated from the distribution of end-to-end distances of polymer chains using the Mark–Curro method. Relatively small amount of nanofibers was found to increase the normalized moduli of the composite. Our results are quite in satisfactory qualitative agreement with experimental data reported in the literature. This shows that computer simulations provide a powerful tool in predicting physical properties of composite materials.

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Acknowledgements

KIJ and MAS gratefully acknowledge the financial support by The National Textile Center at Georgia Tech. It is also a pleasure to acknowledge the financial support provided by the National Science Foundation through Grants DMR-0314760 (Polymers Program, Division of Materials Research) to JEM and INT-9605191 and INT-0111334 (US-EGYPT International Programs) to JEM and MAS. MAS gratefully acknowledge the financial support provided by US-Egypt Science and Technology Joint Fund through grant MAN7-001-002. AK acknowledges the financial support provided by the NIH grant 1R01GM072014-01. We would like to thank the referee for very helpful comments.

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Authors and Affiliations

  1. Department of Chemistry, Helwan University, Ain Helwan, Cairo, 11791, Egypt

    Mohammed A. Sharaf

  2. School of Polymer, Textile and Fiber Engineering, Georgia Institute of Technology, Atlanta, GA, 30332-0295, USA

    Mohammed A. Sharaf & Karl I. Jacob

  3. G. W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, GA, 30332-0295, USA

    Karl I. Jacob

  4. L.H. Baker Center for Bioinformatics and Biological Statistics, 123 Office and Laboratory Bldg., Iowa State University, Ames, IA, 50011-0302, USA

    Andrzej Kloczkowski & Taner Z. Sen

  5. Department of Biochemistry, Biophysics, and Molecular Biology, Iowa State University, Ames, IA, 50011, USA

    Taner Z. Sen

  6. Department of Chemistry and the Polymer Research Center, The University of Cincinnati, Cincinnati, OH, 45221-0172, USA

    James E. Mark

Authors
  1. Mohammed A. Sharaf
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  2. Andrzej Kloczkowski
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  3. Taner Z. Sen
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  4. Karl I. Jacob
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  5. James E. Mark
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Correspondence to Andrzej Kloczkowski.

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Sharaf, M.A., Kloczkowski, A., Sen, T.Z. et al. Molecular modeling of matrix chain deformation in nanofiber filled composites. Colloid Polym Sci 284, 700–709 (2006). https://doi.org/10.1007/s00396-005-1435-x

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  • DOI: https://doi.org/10.1007/s00396-005-1435-x

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