A novel click-chemistry approach to flame retardant polyurethanes

Borreguero, Ana M., Sharma, Pallavi, Spiteri, Christian, Velencoso, María M., Carmona, Manuel S., 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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