This paper deals with the Layer by Layer assembly of an all-polymer chitosan/poly(allylamine diphosphonate) coating characterized by high efficiency in reducing the flammability of open cell polyurethane foams. The Layer by Layer assembly of the two components yields a supralinear growing coating that can be easily deposited on the complex 3D structure of polyurethane foams while preserving the open cell nature of the substrate. 2 bi-layers (BL) are enough to guarantee the deposition of a continuous thin coating capable of preventing the dangerous melt dripping phenomenon during flammability tests. The very same coating can dramatically reduce the heat release rate under a 35 kW/m2 heat flux as it can efficiently hinder the foam structural collapsing during combustion. 2 BL coatings achieve a reduction of 48% while 4 BL reaches the maximum reduction of 55%, thus confirming the great efficiency of the coating in reducing the PU flammability at such low deposition steps and coating thicknesses.

All-polymer Layer by Layer coating as efficient solution to polyurethane foam flame retardancy / F. Carosio, C. Negrell Guirao, J. Alongi, G. David, G. Camino. - In: EUROPEAN POLYMER JOURNAL. - ISSN 0014-3057. - 70:(2015 Jul 02), pp. 94-103. [10.1016/j.eurpolymj.2015.07.001]

All-polymer Layer by Layer coating as efficient solution to polyurethane foam flame retardancy

J. Alongi;
2015

Abstract

This paper deals with the Layer by Layer assembly of an all-polymer chitosan/poly(allylamine diphosphonate) coating characterized by high efficiency in reducing the flammability of open cell polyurethane foams. The Layer by Layer assembly of the two components yields a supralinear growing coating that can be easily deposited on the complex 3D structure of polyurethane foams while preserving the open cell nature of the substrate. 2 bi-layers (BL) are enough to guarantee the deposition of a continuous thin coating capable of preventing the dangerous melt dripping phenomenon during flammability tests. The very same coating can dramatically reduce the heat release rate under a 35 kW/m2 heat flux as it can efficiently hinder the foam structural collapsing during combustion. 2 BL coatings achieve a reduction of 48% while 4 BL reaches the maximum reduction of 55%, thus confirming the great efficiency of the coating in reducing the PU flammability at such low deposition steps and coating thicknesses.
Chitosan; Fire protection; Layer by Layer; Polyurethane foams; Thermal stability; Polymers and Plastics; Physics and Astronomy (all); Organic Chemistry
Settore CHIM/04 - Chimica Industriale
2-lug-2015
http://www.sciencedirect.com/science/article/pii/S0014305715003389
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/464093
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