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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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Published/Copyright: June 22, 2020
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International Polymer Processing
From the journal International Polymer Processing Volume 35 Issue 3

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.

*Correspondence address, Mail address: Ton Peijs, WMG, Materials Engineering Centre, The University of Warwick, CV4 7AL, Coventry, UK, E-mail:

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Received: 2019-09-20
Accepted: 2020-03-23
Published Online: 2020-06-22
Published in Print: 2020-07-03

© 2020, Carl Hanser Verlag, Munich

Articles in the same Issue

  1. Contents
  2. Contents
  3. Regular Contributed Articles
  4. Study of Mechanical and Moisture Absorption Behavior of Epoxy/Cloisite-15A Nanocomposites Processed Using Twin Screw Extruder
  5. Fabrication of Poly Vinyl Acetate (PVAc) Nanofibers Using DMAC Solvent: Effect of Molecular Weight, Optimization by Taguchi DoE
  6. Effect of Poly(phenylene sulfide) (PPS) as Functional Additive on the Physical Properties of Poly(phenylene ether) (PPE)/PPS Blends
  7. Enhanced Dispersion and Mechanical Behavior of Polypropylene Composites Compounded Using Extension-Dominated Extrusion
  8. The Influence of Melt-Mixing Conditions and State of Dispersion on Crystallisation, Rheology and Mechanical Properties of PCL/Sepiolite Nanocomposites
  9. Experimental and Numerical Investigation on Indentation of Orthotropic Microplates with Finite Thickness
  10. Microcellular Thermosetting Polyurethane Foams
  11. Utilisation of Waste Plantain (Musa Paradisiaca) Peels and Waste Polystyrene in the Development of Reinforced Polymer Composites
  12. PPS News
  13. PPS News
  14. Seikei Kakou Abstracts
  15. Seikei Kakou Abstracts
https://doi.org/10.3139/217.3890

Articles in the same Issue

  1. Contents
  2. Contents
  3. Regular Contributed Articles
  4. Study of Mechanical and Moisture Absorption Behavior of Epoxy/Cloisite-15A Nanocomposites Processed Using Twin Screw Extruder
  5. Fabrication of Poly Vinyl Acetate (PVAc) Nanofibers Using DMAC Solvent: Effect of Molecular Weight, Optimization by Taguchi DoE
  6. Effect of Poly(phenylene sulfide) (PPS) as Functional Additive on the Physical Properties of Poly(phenylene ether) (PPE)/PPS Blends
  7. Enhanced Dispersion and Mechanical Behavior of Polypropylene Composites Compounded Using Extension-Dominated Extrusion
  8. The Influence of Melt-Mixing Conditions and State of Dispersion on Crystallisation, Rheology and Mechanical Properties of PCL/Sepiolite Nanocomposites
  9. Experimental and Numerical Investigation on Indentation of Orthotropic Microplates with Finite Thickness
  10. Microcellular Thermosetting Polyurethane Foams
  11. Utilisation of Waste Plantain (Musa Paradisiaca) Peels and Waste Polystyrene in the Development of Reinforced Polymer Composites
  12. PPS News
  13. PPS News
  14. Seikei Kakou Abstracts
  15. Seikei Kakou Abstracts
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