A novel click-chemistry approach to flame retardant polyurethanes

Borreguero, Ana M. and Sharma, Pallavi and Spiteri, Christian and Velencoso, María M. and Carmona, Manuel S. and Moses, John E. and Rodríguez, Juan F. (2013) A novel click-chemistry approach to flame retardant polyurethanes. Reactive and Functional Polymers, 73 (9). pp. 1207-1212. ISSN 1381-5148

Full content URL: http://dx.doi.org/10.1016/j.reactfunctpolym.2013.0...

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Item Type:Article
Item Status:Live Archive

Abstract

The low thermo-oxidative properties of PU foams somewhat limits their practical application, particularly as heat sensitive materials. The introduction of a covalently linked flame retardant organophosphonate ester into the PU foam was achieved using the CuAAC ‘click’ reaction of an alkyne-polyol and
azidoalkylmonophosphonate. These functionalised materials were prepared in four steps: first, a number
of azidoalkyl monophosphonate compounds were formed via nucleophilic substitution of bromoalkylphosphonates with NaN3; next, polyols bearing terminal alkyne groups were prepared by anionic
ring opening copolymerization between propylene oxide and glycidyl propargyl ether; followed by ‘clicking’ the azidoalkylphosphonate to the polyol and finally, synthesis of the PU foam with 2.4 wt% of ‘‘clickpolyol’’. The functionalised PU foam demonstrated a well-formed polyhedral cell structure and an
increase in the fire resistance, according to the SEM and thermogravimetric analysis, respectively. Even
after thermal treatment at 400 �C, the new PU foam material displayed enhanced flame resistant properties by forming a char layer on the surface of the polymer, whilst maintaining its polyhedral structure

Keywords:Polyurethane, Flame retardant, Click reaction, Polyol
Subjects:F Physical Sciences > F162 Polymer Chemistry
F Physical Sciences > F100 Chemistry
Divisions:College of Science > School of Life Sciences
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ID Code:11244
Deposited On:13 Jul 2013 13:27

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