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Article

Development of Inherently Flame—Retardant Phosphorylated PLA by Combination of Ring-Opening Polymerization and Reactive Extrusion

1
Laboratory of Polymeric and Composite Materials, University of Mons, Place du Parc 23, 7000 Mons, Belgium
2
Polymeric and Composite Materials Unit, Materia Nova Research Center, Nicolas Copernic 3, 7000 Mons, Belgium
*
Author to whom correspondence should be addressed.
Materials 2020, 13(1), 13; https://doi.org/10.3390/ma13010013
Received: 14 November 2019 / Revised: 28 November 2019 / Accepted: 11 December 2019 / Published: 18 December 2019
(This article belongs to the Special Issue Advanced Flame Retardant Materials)
In this study, a highly efficient flame-retardant bioplastic poly(lactide) was developed by covalently incorporating flame-retardant DOPO, that is, 9,10-dihydro-oxa-10-phosphaphenanthrene-10-oxide. To that end, a three-step strategy that combines the catalyzed ring-opening polymerization (ROP) of L,L-lactide (L,L-LA) in bulk from a pre-synthesized DOPO-diamine initiator, followed by bulk chain-coupling reaction by reactive extrusion of the so-obtained phosphorylated polylactide (PLA) oligomers (DOPO-PLA) with hexamethylene diisocyanate (HDI), is described. The flame retardancy of the phosphorylated PLA (DOPO-PLA-PU) was investigated by mass loss cone calorimetry and UL-94 tests. As compared with a commercially available PLA matrix, phosphorylated PLA shows superior flame-retardant properties, that is, (i) significant reduction of both the peak of heat release rate (pHRR) and total heat release (THR) by 35% and 36%, respectively, and (ii) V0 classification at UL-94 test. Comparisons between simple physical DOPO-diamine/PLA blends and a DOPO-PLA-PU material were also performed. The results evidenced the superior flame-retardant behavior of phosphorylated PLA obtained by a reactive pathway. View Full-Text
Keywords: reactive flame retardancy; PLA ROP; chain extension; DOPO reactive flame retardancy; PLA ROP; chain extension; DOPO
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MDPI and ACS Style

Mincheva, R.; Guemiza, H.; Hidan, C.; Moins, S.; Coulembier, O.; Dubois, P.; Laoutid, F. Development of Inherently Flame—Retardant Phosphorylated PLA by Combination of Ring-Opening Polymerization and Reactive Extrusion. Materials 2020, 13, 13. https://doi.org/10.3390/ma13010013

AMA Style

Mincheva R, Guemiza H, Hidan C, Moins S, Coulembier O, Dubois P, Laoutid F. Development of Inherently Flame—Retardant Phosphorylated PLA by Combination of Ring-Opening Polymerization and Reactive Extrusion. Materials. 2020; 13(1):13. https://doi.org/10.3390/ma13010013

Chicago/Turabian Style

Mincheva, Rosica, Hazar Guemiza, Chaimaa Hidan, Sébastien Moins, Olivier Coulembier, Philippe Dubois, and Fouad Laoutid. 2020. "Development of Inherently Flame—Retardant Phosphorylated PLA by Combination of Ring-Opening Polymerization and Reactive Extrusion" Materials 13, no. 1: 13. https://doi.org/10.3390/ma13010013

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