Simultaneously improving the fire performance and toughness of polylactic acid by reactive blending with castor oil-based polyurethane and ammonium polyphosphate

A new method has been presented to simultaneously enhance both the flame retardancy and toughness of polylactide acid composites by introducing castor oil-based polyurethane and ammonium polyphosphate via reactive blending. The in situ polymerization of castor oil and toluene diisocyanate in the polylactide acid matrix has been confirmed by the Fourier transform infrared spectroscopy. The flame retardant test results indicate that the introduction of 20% ammonium polyphosphate can increase the limiting oxygen index of polylactide acid composites from 19.3% to 27.2%, upgrade the UL-94 rating from no rating to V-0, and decrease the peak heat release rate from 505.5 to 337.0 kW/m2. Moreover, the toughness of polylactide acid is also improved significantly, with the elongation at break and notched impact strength increasing to 37.0% and 7.59 kJ/m2, respectively. The possible mechanisms for both flame retardancy and toughness are also discussed and proposed.

[1]  J. Xin,et al.  Highly efficient flame retardant and smoke suppression mechanism of boron modified graphene Oxide/Poly(Lactic acid) nanocomposites , 2019, Carbon.

[2]  Hao Wang,et al.  Synthesis of decorated graphene with P, N-containing compounds and its flame retardancy and smoke suppression effects on polylactic acid , 2019, Composites Part B: Engineering.

[3]  S. Bourbigot,et al.  The preparation of a bio-polyelectrolytes based core-shell structure and its application in flame retardant polylactic acid composites , 2019, Composites Part A: Applied Science and Manufacturing.

[4]  Pingan Song,et al.  Green and Scalable Fabrication of Core–Shell Biobased Flame Retardants for Reducing Flammability of Polylactic Acid , 2019, ACS Sustainable Chemistry & Engineering.

[5]  Sheng Zhang,et al.  Is there any way to simultaneously enhance both the flame retardancy and toughness of polylactic acid , 2019 .

[6]  Zongwen Zhang,et al.  The preparation of fully bio‐based flame retardant poly(lactic acid) composites containing casein , 2018 .

[7]  Zhengping Fang,et al.  Core-shell flame retardant/graphene oxide hybrid： a self-assembly strategy towards reducing fire hazard and improving toughness of polylactic acid , 2018, Composites Science and Technology.

[8]  Bin Yu,et al.  Advances in Flame Retardant Poly(Lactic Acid) , 2018, Polymers.

[9]  Xiu-li Wang,et al.  Tough and flame-retardant poly(lactic acid) composites prepared via reactive blending with biobased ammonium phytate and in situ formed crosslinked polyurethane , 2018, Composites Communications.

[10]  Linghui Meng,et al.  Mechanically Robust, Flame-Retardant Poly(lactic acid) Biocomposites via Combining Cellulose Nanofibers and Ammonium Polyphosphate , 2018, ACS omega.

[11]  Hadeel Hosney,et al.  Epoxidized vegetable oil and bio‐based materials as PVC plasticizer , 2018 .

[12]  Linan Liu,et al.  Graft Polymerization of Acrylic Monomers onto Lignin with CaCl2–H2O2 as Initiator: Preparation, Mechanism, Characterization, and Application in Poly(lactic acid) , 2018 .

[13]  Hao Wang,et al.  Flame retardant and mechanically tough poly(lactic acid) biocomposites via combining ammonia polyphosphate and polyethylene glycol , 2017 .

[14]  M. Misra,et al.  Novel biocomposites from biobased PC/PLA blend matrix system for durable applications , 2017 .

[15]  S. Bourbigot,et al.  The fire performance of polylactic acid containing a novel intumescent flame retardant and intercalated layered double hydroxides , 2017, Journal of Materials Science.

[16]  Linan Liu,et al.  Fire-Resistant, Strong, and Green Polymer Nanocomposites Based on Poly(lactic acid) and Core–Shell Nanofibrous Flame Retardants , 2017 .

[17]  S. Zhang,et al.  The effect of chitosan on the flammability and thermal stability of polylactic acid/ammonium polyphosphate biocomposites. , 2017, Carbohydrate polymers.

[18]  Xuesi Chen,et al.  Synthesis of PLLA-based block copolymers for improving melt strength and toughness of PLLA by in situ reactive blending , 2017 .

[19]  P. Fang,et al.  Toughening of polylactide via in situ formation of polyurethane crosslinked elastomer during reactive blending , 2017 .

[20]  K. Zia,et al.  Bio-based polyurethane: An efficient and environment friendly coating systems: A review , 2016 .

[21]  Kunyu Zhang,et al.  Supertoughened renewable PLA reactive multiphase blends system: phase morphology and performance. , 2014, ACS applied materials & interfaces.

[22]  P. J. Lemstra,et al.  In-situ compatibilization of poly(lactic acid) and poly(butylene adipate-co-terephthalate) blends by using dicumyl peroxide as a free-radical initiator , 2014 .

[23]  Yu-Zhong Wang,et al.  In situ formed crosslinked polyurethane toughened polylactide , 2014 .

[24]  Yu-Zhong Wang,et al.  Super-tough poly(L-lactide)/crosslinked polyurethane blends with tunable impact toughness , 2014 .

[25]  D. Cho,et al.  Effect of aluminum trihydroxide on flame retardancy and dynamic mechanical and tensile properties of kenaf/poly(lactic acid) green composites , 2013 .

[26]  V. Cádiz,et al.  Renewable polymeric materials from vegetable oils: a perspective , 2013 .

[27]  Xiu-li Wang,et al.  A method for simultaneously improving the flame retardancy and toughness of PLA , 2011 .

[28]  A. Anguissola.  Author Biographies , 2006, Schools.

[29]  A. S. Luyt,et al.  Morphology, thermal and dynamic mechanical properties of poly(lactic acid)/expandable graphite (PLA/EG) flame retardant composites , 2019 .

[30]  M. Misra,et al.  Novel Durable Biocomposites from Biobased PC/PLA Blend Matrix System , 2017 .

[31]  M. Iji,et al.  Enhanced Flame Retardancy of Polylactic Acid with Aluminum Tri-Hydroxide and Phenolic Resins , 2009 .