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Polymers 2018, 10(8), 816;

Morphological and Tribological Properties of PMMA/Halloysite Nanocomposites

National Research and Development Institute for Chemistry and Petrochemistry-ICECHIM, Bucharest 060021, Romania
Fundacion Tecnalia Research and Innovation, Donostia-San Sebastian 20009, Spain
Maier Technology Centre, R&D Department, Polígono industrial Arabieta 48320, Spain
Authors to whom correspondence should be addressed.
Received: 14 June 2018 / Revised: 4 July 2018 / Accepted: 21 July 2018 / Published: 25 July 2018
(This article belongs to the Special Issue Polymers: Design, Function and Application)
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From an environmental and cost-effective perspective, a number of research challenges can be found for electronics, household, but especially in the automotive polymer parts industry. Reducing synthesis steps, parts coating and painting, or other solvent-assisted processes, have been identified as major constrains for the existing technologies. Therefore, simple polymer processing routes (mixing, extrusion, injection moulding) were used for obtaining PMMA/HNT nanocomposites. By these techniques, an automotive-grade polymethylmethacrylate (PMMA) was modified with halloysite nanotubes (HNT) and an eco-friendly additive N,N′-ethylenebis(stearamide) (EBS) to improve nanomechanical properties involved in scratch resistance, mechanical properties (balance between tensile strength and impact resistance) without diminishing other properties. The relationship between morphological/structural (XRD, TEM, FTIR) and tribological (friction) properties of PMMA nanocomposites were investigated. A synergistic effect was found between HNT and EBS in the PMMA matrix. The synergy was attained by the phase distribution resulted from the selective interaction between partners and favourable processing conditions. Modification of HNT with EBS improved the dispersion of nanoparticles in the polymer matrix by increasing their interfacial compatibility through hydrogen bonding established by amide groups with aluminol groups. The increased interfacial adhesion further improved the nanocomposite scratch resistance. The PMMA/HNT-EBS nanocomposite had a lower coefficient of friction and lower scratch penetration depth than PMMA/HNT nanocomposite. View Full-Text
Keywords: PMMA; halloysite nanotube; nanoscratch; friction; morphology PMMA; halloysite nanotube; nanoscratch; friction; morphology

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Vuluga, Z.; Corobea, M.C.; Elizetxea, C.; Ordonez, M.; Ghiurea, M.; Raditoiu, V.; Nicolae, C.A.; Florea, D.; Iorga, M.; Somoghi, R.; Trica, B. Morphological and Tribological Properties of PMMA/Halloysite Nanocomposites. Polymers 2018, 10, 816.

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