Influence of Phosphorus Structures and Their Oxidation States on Flame-Retardant Properties of Polyhydroxyurethanes
This article focuses on the synthesis of polyhydroxyurethane (PHU) materials containing novel phosphorus flame retardants (FR). Four different phosphorus compounds were grafted onto cyclic carbonate: 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO), diethyl phosphite (DEP), diphenyl phosphi...
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| Format: | Article |
| Language: | English |
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MDPI AG
2023-01-01
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| Series: | Molecules |
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| Online Access: | https://www.mdpi.com/1420-3049/28/2/611 |
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| author | Maxinne Denis Guilhem Coste Rodolphe Sonnier Sylvain Caillol Claire Negrell |
| author_facet | Maxinne Denis Guilhem Coste Rodolphe Sonnier Sylvain Caillol Claire Negrell |
| author_sort | Maxinne Denis |
| collection | DOAJ |
| description | This article focuses on the synthesis of polyhydroxyurethane (PHU) materials containing novel phosphorus flame retardants (FR). Four different phosphorus compounds were grafted onto cyclic carbonate: 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO), diethyl phosphite (DEP), diphenyl phosphite (DPP) and dibenzo[d,f][1,3,2]dioxaphosphepine 6-oxide (BPPO). Thus, three novel phosphorus reactive cyclic carbonates which have never been reported so far were synthetized. Phosphorus FR containing PHU materials were characterized by FTIR to evidence the total conversion of the cyclic carbonate. Moreover, the gel contents up to 80% confirmed the formation of the polymer network. Then, the thermal stability and the flame-retardant properties were investigated by thermogravimetric analyses, cone calorimeter and pyrolysis combustion flow calorimeter. The mode of action of phosphorus compounds, depending on the oxidation state, was especially highlighted. Phosphonate (+III) provided better action in a condensed phase than phosphinate thanks to a more efficient char formation. Among phosphonates, differences were observed in terms of char-formation rate and expansion. DEP provided the best flame-retardant properties, with a reduction of 76% of pHRR with 2 wt% of phosphorus in cone calorimeter analysis. Therefore, this article highlighted the different modes of action of phosphorus flame retardants, depending on the oxidation state of phosphorus, in PHU materials. |
| first_indexed | 2024-03-09T11:35:58Z |
| format | Article |
| id | doaj.art-778458ca5bc44c89b88b80bda33016ff |
| institution | Directory Open Access Journal |
| issn | 1420-3049 |
| language | English |
| last_indexed | 2024-03-09T11:35:58Z |
| publishDate | 2023-01-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Molecules |
| spelling | doaj.art-778458ca5bc44c89b88b80bda33016ff2023-11-30T23:42:18ZengMDPI AGMolecules1420-30492023-01-0128261110.3390/molecules28020611Influence of Phosphorus Structures and Their Oxidation States on Flame-Retardant Properties of PolyhydroxyurethanesMaxinne Denis0Guilhem Coste1Rodolphe Sonnier2Sylvain Caillol3Claire Negrell4ICGM, Université de Montpellier, CNRS, ENSCM, 34000 Montpellier, FranceICGM, Université de Montpellier, CNRS, ENSCM, 34000 Montpellier, FrancePolymers Composites and Hybrids (PCH), IMT Mines Ales, 30100 Ales, FranceICGM, Université de Montpellier, CNRS, ENSCM, 34000 Montpellier, FranceICGM, Université de Montpellier, CNRS, ENSCM, 34000 Montpellier, FranceThis article focuses on the synthesis of polyhydroxyurethane (PHU) materials containing novel phosphorus flame retardants (FR). Four different phosphorus compounds were grafted onto cyclic carbonate: 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO), diethyl phosphite (DEP), diphenyl phosphite (DPP) and dibenzo[d,f][1,3,2]dioxaphosphepine 6-oxide (BPPO). Thus, three novel phosphorus reactive cyclic carbonates which have never been reported so far were synthetized. Phosphorus FR containing PHU materials were characterized by FTIR to evidence the total conversion of the cyclic carbonate. Moreover, the gel contents up to 80% confirmed the formation of the polymer network. Then, the thermal stability and the flame-retardant properties were investigated by thermogravimetric analyses, cone calorimeter and pyrolysis combustion flow calorimeter. The mode of action of phosphorus compounds, depending on the oxidation state, was especially highlighted. Phosphonate (+III) provided better action in a condensed phase than phosphinate thanks to a more efficient char formation. Among phosphonates, differences were observed in terms of char-formation rate and expansion. DEP provided the best flame-retardant properties, with a reduction of 76% of pHRR with 2 wt% of phosphorus in cone calorimeter analysis. Therefore, this article highlighted the different modes of action of phosphorus flame retardants, depending on the oxidation state of phosphorus, in PHU materials.https://www.mdpi.com/1420-3049/28/2/611non-isocyanate polyurethanepolyhydroxyurethaneflame retardantphosphinatephosphonate |
| spellingShingle | Maxinne Denis Guilhem Coste Rodolphe Sonnier Sylvain Caillol Claire Negrell Influence of Phosphorus Structures and Their Oxidation States on Flame-Retardant Properties of Polyhydroxyurethanes Molecules non-isocyanate polyurethane polyhydroxyurethane flame retardant phosphinate phosphonate |
| title | Influence of Phosphorus Structures and Their Oxidation States on Flame-Retardant Properties of Polyhydroxyurethanes |
| title_full | Influence of Phosphorus Structures and Their Oxidation States on Flame-Retardant Properties of Polyhydroxyurethanes |
| title_fullStr | Influence of Phosphorus Structures and Their Oxidation States on Flame-Retardant Properties of Polyhydroxyurethanes |
| title_full_unstemmed | Influence of Phosphorus Structures and Their Oxidation States on Flame-Retardant Properties of Polyhydroxyurethanes |
| title_short | Influence of Phosphorus Structures and Their Oxidation States on Flame-Retardant Properties of Polyhydroxyurethanes |
| title_sort | influence of phosphorus structures and their oxidation states on flame retardant properties of polyhydroxyurethanes |
| topic | non-isocyanate polyurethane polyhydroxyurethane flame retardant phosphinate phosphonate |
| url | https://www.mdpi.com/1420-3049/28/2/611 |
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