A novel click-chemistry approach to flame retardant polyurethanes

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

DOI: 10.1016/j.reactfunctpolym.2013.06.003


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. © 2013 Elsevier Ltd. All rights reserved.

Item Type: Paper
Subjects: chemistry > chemical synthesis
chemistry > techniques > click chemistry
CSHL Authors:
Communities: CSHL labs > Moses lab
SWORD Depositor: CSHL Elements
Depositing User: CSHL Elements
Date: September 2013
Date Deposited: 06 Jul 2021 20:42
Last Modified: 06 Jul 2021 20:42
Related URLs:
URI: https://repository.cshl.edu/id/eprint/40249

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