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Phosphine Oxide Containing Poly(pyridinium salt)s as Fire Retardant Materials

InnoSense LLC, 2531 West 237th Street, Torrance, CA 90505, USA
Department of Chemistry and Biochemistry, University of Nevada Las Vegas, 4505 Maryland Parkway Box 454003, Las Vegas, NV 89154-4003, USA
Author to whom correspondence should be addressed.
Polymers 2019, 11(7), 1141;
Received: 12 June 2019 / Revised: 30 June 2019 / Accepted: 1 July 2019 / Published: 3 July 2019
(This article belongs to the Special Issue Phosphorus-Containing Polymers)
PDF [8698 KB, uploaded 3 July 2019]


Six new rugged, high-temperature tolerant phosphine oxide-containing poly(4,4′-(p-phenylene)-bis(2,6-diphenylpyridinium)) polymers P-1, P-2, P-3, P-4, P-5, and P-6 are synthesized, characterized, and evaluated. Synthesis results in high yield and purity, as confirmed by elemental, proton (1H), and carbon 13 (13C) nuclear magnetic resonance (NMR) spectra analyses. High glass transition temperatures (Tg > 230 °C) and high char yields (>50% at 700 °C) are determined by differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA), respectively. These new ionic polymers exhibit excellent processability, thin-film forming, high-temperature resistance, fire-resistance and retardation, coating, adhesion, mechanical and tensile strength, and n-type (electron transport) properties. The incorporation of phosphine oxide and bis(phenylpyridinium) moieties in the polymer backbones leads to high glass transition temperatures and excellent fire retardant properties, as determined by microcalorimetry measurements. The use of organic counterions allows these ionic polymers to be easily processable from several common organic solvents. A large variety of these polymers can be synthesized by utilizing structural variants of the bispyrylium salt, phosphine oxide containing diamine, and the counterion in a combinatorial fashion. These results make them very attractive for a number of applications, including as coating and structural component materials for automobiles, aircrafts, power and propulsion systems, firefighter garments, printed circuit boards, cabinets and housings for electronic and electrical components, construction materials, mattresses, carpets, upholstery and furniture, and paper-thin coatings for protecting important paper documents. View Full-Text
Keywords: phosphine oxide; poly(pyridinium salt)s; fire retardant polymers; atomic force microscopy; luminescence; UV-Vis spectroscopy; microcalorimetry phosphine oxide; poly(pyridinium salt)s; fire retardant polymers; atomic force microscopy; luminescence; UV-Vis spectroscopy; microcalorimetry

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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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Alam, M.M.; Biswas, B.; Nedeltchev, A.K.; Han, H.; Ranasinghe, A.D.; Bhowmik, P.K.; Goswami, K. Phosphine Oxide Containing Poly(pyridinium salt)s as Fire Retardant Materials. Polymers 2019, 11, 1141.

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