Development of bioepoxy resin microencapsulated ammonium-polyphosphate for flame retardancy of polylactic acid

Kata Decsov, Katalin Bocz, Beáta Szolnoki, Serge Bourbigot, Gaëlle Fontaine, Dániel Vadas, György Marosi

Research output: Article

Abstract

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.

Original languageEnglish
Article number4123
JournalMolecules
Volume24
Issue number22
DOIs
Publication statusPublished - nov. 14 2019

Fingerprint

Polyphosphates
Ammonium Compounds
resins
flames
flame retardants
Resins
acids
scanning
ethers
heat measurement
infrared spectroscopy
charring
Flame Retardants
Microencapsulation
Drug Compounding
flammability
composite materials
Sorbitol
biopolymers
ratings

ASJC Scopus subject areas

  • Analytical Chemistry
  • Chemistry (miscellaneous)
  • Molecular Medicine
  • Pharmaceutical Science
  • Drug Discovery
  • Physical and Theoretical Chemistry
  • Organic Chemistry

Cite this

Development of bioepoxy resin microencapsulated ammonium-polyphosphate for flame retardancy of polylactic acid. / Decsov, Kata; Bocz, Katalin; Szolnoki, Beáta; Bourbigot, Serge; Fontaine, Gaëlle; Vadas, Dániel; Marosi, György.

In: Molecules, Vol. 24, No. 22, 4123, 14.11.2019.

Research output: Article

Decsov, Kata ; Bocz, Katalin ; Szolnoki, Beáta ; Bourbigot, Serge ; Fontaine, Gaëlle ; Vadas, Dániel ; Marosi, György. / Development of bioepoxy resin microencapsulated ammonium-polyphosphate for flame retardancy of polylactic acid. In: Molecules. 2019 ; Vol. 24, No. 22.
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abstract = "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.",
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