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Effects of innovative aromatic phosphorus containing flame-retardant polyols on rigid polyurethane foams

Yuqiang Wu, Jingshui Xu, Jianlei Zhang, Yashui Xie, and Guoliang Zhang

College of Environmental Science and Engineering, Fujian Normal University, Fuzhou, People’s Republic of China



Received: 9 November 2020  Accepted: 15 February 2021


In this paper, innovative aromatic phosphorus containing flame-retardant polyols (DOPO-MA-EG) were synthesized by employing 9, 10-dihydro-9-oxa-10- phosphaphenanthrene-10-oxide (DOPO), maleic acid (MA) and ethylene glycol (EG) as reactants via a two-step process. The chemical structures of DOPO-MA-EG were characterized by 1H nuclear magnetic resonance (NMR) and Fourier transform infrared (FTIR). Then the DOPO-MA-EG acted as a chain-extender was introduced into the main chains of rigid polyurethane foams (PUFs) for generating inherently flame-retardant PUFs (FR-PUFs). Results showed that DOPO-MA-EG can endow FR-PUFs with a great flame retardancy. The limiting oxygen index (LOI) of FR-PUF-4 was increased from 19.8 to 26.3% as compared to pure PUF. Additionally, the cone calorimeter result demonstrated that DOPO-MA-EG can effectively reduce the peak heat release rate (HRR), total heat release (THR), but smoke production rate (SPR) and total smoke production (TSP) of FR-PUFs increased as the increasing of the P contents. Conclusively, the present work demonstrates that the synthetic DOPO-MA-EG is good reactive flame-retardant polyols with a potential application for PUFs.

Keywords: Rigid polyurethane foam; Reactive flame-retardant polyols; Flame retardancy; Physical mechanical property

Full paper is available at

DOI: 10.1007/s11696-021-01571-5


Chemical Papers 75 (7) 3373–3385 (2021)

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