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Open AccessArticle

Development of Bioepoxy Resin Microencapsulated Ammonium-Polyphosphate for Flame Retardancy of Polylactic Acid

1
Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, H-1111 Budapest, Budafoki street 8., Hungary
2
Unité Matériaux et Transformations (UMET), CNRS UMR 8207, École Nationale supérieure de Chimie de Lille, University of Lille, Bâtiment C6, Cité Scientifique, 59652 Villeneuve d’Ascq Cedex, France
*
Author to whom correspondence should be addressed.
Molecules 2019, 24(22), 4123; https://doi.org/10.3390/molecules24224123
Received: 30 September 2019 / Revised: 11 November 2019 / Accepted: 12 November 2019 / Published: 14 November 2019
(This article belongs to the Special Issue Innovative Flame Retardants)
Ammonium-polyphosphate (APP) was modified by microencapsulation with a bio-based sorbitol polyglycidyl ether (SPE)-type epoxy resin and used as a flame retardant additive in polylactic acid (PLA) matrix. The bioresin-encapsulated APP (MCAPP) particles were characterized using Fourier transform infrared (FTIR) spectroscopy and Raman mapping, particle size distribution was determined by processing of scanning electron microscopic (SEM) images. Interaction between the APP core and the bioresin shell was revealed by combined thermogravimetric analysis (TGA)‑FTIR spectroscopy. The APP to SPE mass ratio of 10 to 2 was found to be optimal in terms of thermal, flammability, and mechanical properties of 15 wt% additive containing biocomposites. The bioresin shell effectively promotes the charring of the APP-loaded PLA composites, as found using TGA and cone calorimetry, and eliminates the flammable dripping of the specimens during the UL-94 vertical burning tests. Thus, the V-0 rating, the increased limiting oxygen index, and the 20% reduced peak of the heat release rate was reached compared to the effects of neat APP. Furthermore, better interfacial interaction of the MCAPP with PLA was indicated by differential scanning calorimetry and SEM observation. The stiff interphase resulted in increased modulus of these composites. Besides, microencapsulation provided improved water resistance to the flame retardant biopolymer system. View Full-Text
Keywords: polylactic acid; intumescent flame retardant; ammonium polyphosphate; microencapsulation; bioepoxy polylactic acid; intumescent flame retardant; ammonium polyphosphate; microencapsulation; bioepoxy
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Decsov, K.; Bocz, K.; Szolnoki, B.; Bourbigot, S.; Fontaine, G.; Vadas, D.; Marosi, G. Development of Bioepoxy Resin Microencapsulated Ammonium-Polyphosphate for Flame Retardancy of Polylactic Acid. Molecules 2019, 24, 4123.

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