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      The Influence of Melt-Mixing Conditions and State of Dispersion on Crystallisation, Rheology and Mechanical Properties of PCL/Sepiolite Nanocomposites

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          Abstract

          It is generally accepted that the benefit of anisotropic nanofiller addition is strongly dependent on the state of the dispersion of these fillers in a polymer matrix. In this paper the influence of melt-compounding conditions on the dispersion of a needle-like clay, i. e. sepiolite, in poly(∊-caprolactone) (PCL) is investigated. The crystallisation behavior as well as the rheological and mechanical properties of PCL/sepiolite nanocomposites with filler contents up to 5 wt.% are studied. By changing the screw speed during melt-mixing in a micro-compounder, the state of dispersion was varied, with the higher speed leading to better dispersion and breakdown of the sepiolite agglomerates or bundles. Rheometry showed that better dispersed nanocomposites displayed an increase in viscosity due to network formation at slightly higher filler loadings. Likewise, better dispersed composites showed a modest increase in crystallisation temperature at low filler content, accompanied by a decrease in both nucleation efficiency and degree of crystallisation at higher loadings. Better dispersed nanocomposite systems also showed superior mechanical properties, particularly at higher filler loadings. However, overall the reinforcing efficiency of sepiolite in all nanocomposites was relatively low. This was mainly a consequence of the relatively low filler aspect ratio and the simultaneous breakup of sepiolite needles together with a breakdown of bundles during compounding.

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          Most cited references 60

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          Polymer-layered silicate nanocomposites: preparation, properties and uses of a new class of materials

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            Polymer/layered silicate nanocomposites: a review from preparation to processing

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              Modeling properties of nylon 6/clay nanocomposites using composite theories

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                Author and article information

                Journal
                ipp
                International Polymer Processing
                Carl Hanser Verlag
                0930-777X
                2195-8602
                03 July 2020
                : 35
                : 3
                : 302-313
                Affiliations
                1 Laboratory of Polymer Materials, Department of Chemical Engineering and Chemistry, Eindhoven University of Technology, Eindhoven, The Netherlands
                2 Tetra Pak Packaging Solutions AB, Lund, Sweden
                3 WMG, Materials Engineering Centre, The University of Warwick, Coventry, UK
                4 Sabic, Bergen op Zoom, The Netherlands
                Author notes
                [* ] Correspondence address, Mail address: Ton Peijs, WMG, Materials Engineering Centre, The University of Warwick, CV4 7AL, Coventry, UK, E-mail: t.peijs@ 123456warwick.ac.uk
                Article
                IPP3890
                10.3139/217.3890
                © 2020, Carl Hanser Verlag, Munich
                Page count
                References: 65, Pages: 12
                Product
                Self URI (journal page): http://www.hanser-elibrary.com/loi/ipp
                Categories
                Regular Contributed Articles

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