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DTI / MEMTI / A layer by layer assembled barrier to impart flame retardancy to polypropylene substrate 1 A layer by layer assembled barrier to impart flame retardancy to polypropylene substrate Speaker: Anna Rita De Corso Authors: Andrea Castrovinci, Anna Rita De Corso, Simone Martinelli marzo 4, 2017

DTI / MEMTI / A layer by layer assembled barrier to impart flame retardancy to polypropylene substrate 2 Summary • Intro SUPSI • Project goal • Layer by layer technique • Multilayers formulations • Combustion test • Results and conclusions 04/03/17

DTI / MEMTI / A layer by layer assembled barrier to impart flame retardancy to polypropylene substrate 3 Intro University of Applied Sciences and Arts of Southern Switzerland 04/03/17

DTI / MEMTI / A layer by layer assembled barrier to impart flame retardancy to polypropylene substrate 4 Intro Mechanical Engineering And Materials Technology Institute (MEMTi) Mechanical Hybrid Thermofluid Therapeutic Bio- Engineering Materials Dynamics Technologies Environmental Technologies § Structural § Ceramic foams § Simulations of § Pharmaceutical § Waste water simulations (FEM) gas/liquid flows technologies treatment Research topics § Plastic injection § Composite § Thermodynamics § Medical systems § Bio-mass techn. moulding materials § Computational § Material recovery § Metal stamping modeling § Polymeric § Quality materials assurance & regulatory issues § Surface chemistry 04/03/17

DTI / MEMTI / A layer by layer assembled barrier to impart flame retardancy to polypropylene substrate 5 Project goal • Flame retardant coating for a PP substrate • Target performance : B Euroclass according to SBI test (EN 13823) 04/03/17

DTI / MEMTI / A layer by layer assembled barrier to impart flame retardancy to polypropylene substrate 6 Layer by Layer assembly • What is the LbL technique • Why? Materials engineering for surface-confined flame retardarcy, G. Malucelli, F. Carosio, J. Alongi, A. Fina, A. Frache, G. Camino , Material Science and engineering R (2014) 1-20 Layer-by-layer assembly for rapid fabrication of thick polymeric films Yang Li, a Xu Wang a and Junqi Sun* a Chem. Soc. Rev. , 2012, 41 04/03/17

DTI / MEMTI / A layer by layer assembled barrier to impart flame retardancy to polypropylene substrate 7 Coating formulations Intumescent Hybrid Inorganic (organic-inorganic) 1 1 K.Apaydin, A. Laachachi, V. Ball, M. Jimenez, S. Bourbigot, V. Toniazzo and D. Ruch, Polymer Degradation and Stability , 2013 , 98 , 627 . 04/03/17

DTI / MEMTI / A layer by layer assembled barrier to impart flame retardancy to polypropylene substrate 8 Multilayer sequence 1 • No reduction in HRR • Poor adhesion to the PP substate • Polymer melting and dripping Intumescent Inorganic hybrid After 180 sec After 30 sec 04/03/17

DTI / MEMTI / A layer by layer assembled barrier to impart flame retardancy to polypropylene substrate 9 Multilayer sequence 2 • No reduction in HRR • Poor adhesion to the PP substate • Polymer melting and dripping Intumescent Inorganic Hybrid 04/03/17

DTI / MEMTI / A layer by layer assembled barrier to impart flame retardancy to polypropylene substrate 10 Multilayer sequence 3 • Slight reduction in HRR • Good adhesion to the PP substate • Slight melting and dripping Intumescent Inorganic Hybrid 04/03/17

DTI / MEMTI / A layer by layer assembled barrier to impart flame retardancy to polypropylene substrate 11 Multilayer sequence 4 • Good reduction in HRR • Good adhesion to the PP substate • No melting and dripping Inorganic Hybrid 04/03/17

DTI / MEMTI / A layer by layer assembled barrier to impart flame retardancy to polypropylene substrate 12 Combustion test • Screening combustion test: mini Single Burning Item test 1,2 • Best performers : standard SBI test 1 Mini single burning item (miniSBI): a unique lab-scale device to pre-screen reduced specimen for the EN 13823, A. De Corso, A. Castrovinci, Fire resistance in plastics 2015, 8 - 10 December 2015, Cologne, Germany 2 A comparative test campaign between the “mini Single Burning Item” and the standard SBI (EN13823) to assess the correlation between the two testing 04/03/17 facilities, Anna Rita De Corso, Simone Martinelli, Ermanno Oberrauch, Andrea Castrovinci

DTI / MEMTI / A layer by layer assembled barrier to impart flame retardancy to polypropylene substrate 13 Combustion test : miniSBI results 04/03/17

DTI / MEMTI / A layer by layer assembled barrier to impart flame retardancy to polypropylene substrate 14 Conclusions • Effective layer by layer assembled FR coating • Performance assessment by miniSBI • Work in progress : SBI standard test 04/03/17

DTI / MEMTI / A layer by layer assembled barrier to impart flame retardancy to polypropylene substrate 15 Acknowledgments • Dr Jenny Alongi , Department of Chemistry, University of Milan, for fruitful discussions and suggestions • Commission for Technology and Innovation (CTI, Switzerland) Project: FLAme REtarded polypropylene film for coated Steel (FLARES) 04/03/17

DTI / MEMTI / A layer by layer assembled barrier to impart flame retardancy to polypropylene substrate 16 Thank you 04/03/17

DTI / MEMTI / A layer by layer assembled barrier to impart flame retardancy to polypropylene substrate 17 Mini SBI results 04/03/17

DTI / MEMTI / A layer by layer assembled barrier to impart flame retardancy to polypropylene substrate 18 Mini SBI results 04/03/17

DTI / MEMTI / A layer by layer assembled barrier to impart flame retardancy to polypropylene substrate 19 Mini SBI results 04/03/17

DTI / MEMTI / A layer by layer assembled barrier to impart flame retardancy to polypropylene substrate 20 Best performers 04/03/17