Modelling stiffness of polymer/clay nanocomposites

Article

Hbaieb, K., Wang, Q. X., Chia, Y. H. J. and Cotterell, B.. 2007. "Modelling stiffness of polymer/clay nanocomposites." Polymer. 48 (3), pp. 901-909. https://doi.org/10.1016/j.polymer.2006.11.062
Article Title

Modelling stiffness of polymer/clay nanocomposites

ERA Journal ID1688
Article CategoryArticle
AuthorsHbaieb, K. (Author), Wang, Q. X. (Author), Chia, Y. H. J. (Author) and Cotterell, B. (Author)
Journal TitlePolymer
Journal Citation48 (3), pp. 901-909
Number of Pages9
Year2007
PublisherElsevier
Place of PublicationUnited Kingdom
ISSN0032-3861
1873-2291
Digital Object Identifier (DOI)https://doi.org/10.1016/j.polymer.2006.11.062
Web Address (URL)https://www.sciencedirect.com/science/article/abs/pii/S0032386106013097
Abstract

Aligned nanoclay particles can be distributed randomly in a polymer matrix even at high volume fractions, but randomly oriented particles cannot be randomly distributed at high volume fractions. Instead a nanocomposite where there are clusters of nearly aligned particles is obtained. The clusters of nearly aligned particles form an effective particle with lower aspect ratio. This phenomenon which produces a nanocomposite of less stiffness than might have been expected has implications for the processing of nanoclay polymer composites.

It is shown by comparing two-dimensional to three-dimensional finite element studies that the two-dimensional model, often used because it is simpler, does not accurately predict the stiffness. The Mori–Tanaka model is shown to give a reasonably accurate prediction of the stiffness of clay nanocomposites whose volume fraction is less than about 5% for aligned particles but underestimates the stiffness at higher volume fractions. On the other hand for randomly oriented particles the Mori–Tanaka model overestimates the stiffness of clay nanocomposites.

KeywordsFinite element; Mori–Tanaka; Stiffness
ANZSRC Field of Research 2020401706. Numerical modelling and mechanical characterisation
401807. Nanomaterials
401609. Polymers and plastics
401602. Composite and hybrid materials
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Byline AffiliationsInstitute of Materials Research and Engineering, Singapore
Institute of High Performance Computing, Singapore
Institution of OriginUniversity of Southern Queensland
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