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Polymers 2019, 11(2), 233; https://doi.org/10.3390/polym11020233

Development of Flame-Retarded Nanocomposites from Recycled PET Bottles for the Electronics Industry

1
Department of Polymer Engineering, Faculty of Mechanical Engineering, Budapest University of Technology and Economics, Műegyetem rkp. 3, H-1111 Budapest, Hungary
2
Imsys Ltd., Material Testing Laboratory, Mozaik Street 14/A., H-1033 Budapest, Hungary
3
Department of Organic Chemistry and Technology, Faculty of Chemical Technology and Biotechnology, Budapest University of Technology and Economics, Műegyetem rkp. 3, H-1111 Budapest, Hungary
4
Environmental Analytical and Geoanalytical Research Group, Szentágothai Research Centre, University of Pécs, Vasvári Pál str. 4., H-7622 Pécs, Hungary
*
Author to whom correspondence should be addressed.
Received: 30 December 2018 / Revised: 25 January 2019 / Accepted: 25 January 2019 / Published: 1 February 2019
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Abstract

Recycled polyethylene-terephthalate (rPET) nanocomposites of reduced flammability were prepared by combining aluminum-alkylphosphinate (AlPi) flame retardant (FR) and natural montmorillonite (MMT), in order to demonstrate that durable, technical products can be produced from recycled materials. During the development of the material, by varying the FR content, the ratio and the type of MMTs, rheological, morphological, mechanical and flammability properties of the nanocomposites were comprehensively investigated. Related to the differences between the dispersion and nucleation effect of MMT and organo-modified MMT (oMMT) in rPET matrix, analyzed by Scanning Electron Microscopy (SEM), Energy Dispersive X-Ray Spectroscopy (EDS) and Differential Scanning Calorimetry (DSC), mechanical properties of the nanocomposites changed differently. The flexural strength and modulus were increased more significantly by adding untreated MMT than by the oMMT, however the impact strength was decreased by both types of nanofillers. The use of different type of MMTs resulted in contradictory flammability test result; time-to-ignition (TTI) during cone calorimeter tests decreased when oMMT was added to the rPET, however MMT addition resulted in an increase of the TTI also when combined with 4% FR. The limiting oxygen index (LOI) of the oMMT containing composites decreased independently from the FR content, however, the MMT increased it noticeably. V0 classification according to the UL-94 standard was achieved with as low as 4% FR and 1% MMT content. The applicability of the upgraded recycled material was proved by a pilot experiment, where large-scale electronic parts were produced by injection molding and characterized with respect to the commercially available counterparts. View Full-Text
Keywords: upgrading; recycled polyethylene-terephthalate; montmorillonite; flame retardancy; mechanical properties, prototype development upgrading; recycled polyethylene-terephthalate; montmorillonite; flame retardancy; mechanical properties, prototype development
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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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Ronkay, F.; Molnár, B.; Szalay, F.; Nagy, D.; Bodzay, B.; Sajó, I.E.; Bocz, K. Development of Flame-Retarded Nanocomposites from Recycled PET Bottles for the Electronics Industry. Polymers 2019, 11, 233.

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