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Novel Biobased Polyol Using Corn Oil for Highly Flame-Retardant Polyurethane Foams

1
Department of Chemistry, Pittsburg State University, Pittsburg, KS 66762, USA
2
Department of Physics, Pittsburg State University, Pittsburg, KS 66762, USA
*
Author to whom correspondence should be addressed.
Received: 31 January 2019 / Revised: 5 March 2019 / Accepted: 11 March 2019 / Published: 14 March 2019
(This article belongs to the Special Issue Advanced Coal, Biomass and Waste Conversion Technologies)
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Abstract

A novel bio-based polyol was synthesized using corn oil and 2-mercaptoethanol via thiol-ene reaction as an alternative to petroleum-based polyol for the synthesis of polyurethane foams. The polyol was analyzed using wet chemical techniques to obtain hydroxyl number and viscosity. Infrared spectroscopy and gel permeation chromatography were used to confirm the structural properties of the foams. Flame-retardant polyurethane foams were prepared by the addition of different concentrations of dimethyl methyl phosphonate (DMMP) in final foam composition. The effect of DMMP on the thermo-mechanical properties of the polyurethane foams was analyzed. The TGA analysis showed improved stability of the final char with addition of DMMP in the foams. All the foams maintained a well-defined cellular structure and over 95% of closed cell content. The horizontal burning test showed reduced burning time and weight loss from 115 s and 38 wt.% for the neat foams, to 3.5 s and 5.5 wt.% for DMMP-containing foams (1.94 wt.% P). The combustion test using cone calorimeter showed a considerable reduction in heat release rate and total heat release. Thus, our study shows that corn-oil based polyol can be used to produce renewable polyol for industrially producible rigid polyurethane foams. The addition of a small amount of DMMP could result in a significant reduction in the flame-retardant properties of the polyurethane foams. View Full-Text
Keywords: biobased polyol; thiol-ene chemistry; flame-retardant polyurethane foams; thermal insulation biobased polyol; thiol-ene chemistry; flame-retardant polyurethane foams; thermal insulation
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Ramanujam, S.; Zequine, C.; Bhoyate, S.; Neria, B.; Kahol, P.K.; Gupta, R.K. Novel Biobased Polyol Using Corn Oil for Highly Flame-Retardant Polyurethane Foams. C 2019, 5, 13.

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