Unsaturated polyester resin modified with a novel reactive flame retardant: effects on thermal stability and flammability
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Piye Wu
and
Man Xu
Abstract
A new reactive flame retardant (DTA), containing phosphaphenanthrene and triazine-trione groups was synthesized and applied to improve the flame retardancy of unsaturated polyester resin. The thermal stability, flame retardancy and combustion behaviors of UP/DTA thermosets were detected by thermogravimeric analysis (TG), limited oxygen index (LOI), vertical burning (UL94) test and cone calorimeter test. According to the research results, the addition of DTA contributed to improving the flame retardancy of UP. After adding 20 wt% DTA, the LOI of UP composite increased from 19.0% of the neat UP to 26.6%, and UL94 rating reached V-0. In addition, compared with pure UP, the peak heat release rate (pk-HRR), average heat release rate (av-HRR) and total heat release rate (THR) of UP/DTA-20 thermosetting material decreased by 44.0, 26.2 and 29.5%, respectively. In the gaseous phase, DTA decomposed to generate nitrogen-containing fragments with diluting effect and phosphorus-containing free radicals with quenching effect to inhibit the combustion. In the condensed phase, phosphaphenanthrene group of DTA decomposed to generate phosphorus-based compounds, which promoted the carbonization of the UP matrix and cooperated with triazine-trione group to increase the char yield. Therefore, DTA plays an important role in flame retardancy in the gas and condensed phases.
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Author contributions: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.
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Research funding: None declared.
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Conflict of interest statement: The authors declare no conflicts of interest regarding this article.
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Supplementary Material
The online version of this article offers supplementary material (https://doi.org/10.1515/polyeng-2021-0317).
© 2022 Walter de Gruyter GmbH, Berlin/Boston
Articles in the same Issue
- Frontmatter
- Material properties
- Effect of nanodiamond particles on the structure, mechanical, and thermal properties of polymer embedded ND/PMMA composites
- A comparative investigation on wear characteristics of polymer and biopolymer gears
- Unsaturated polyester resin modified with a novel reactive flame retardant: effects on thermal stability and flammability
- Recent progress on the morphology and thermal cycle of phase change materials (PCMs)/conductive filler composites: a mini review
- Effect of tiny amount of DMC on thermal, mechanical, optical, and water resistance properties of poly(vinyl alcohol)
- Vibration and tribological properties of epoxy-granite composites used as novel foundations for machine elements
- Effect of lyocell fiber cross-sectional shape on structure and properties of lyocell/PLA composites
- Engineering and processing
- Quality prediction and control of thin-walled shell injection molding based on GWO-PSO, ACO-BP, and NSGA-II
- Doubly modified MWCNTs embedded in polyethersulfone (PES) ultrafiltration membrane and its anti-fouling performance
- Solid-state extrusion of polymers using simple shear deformation
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Articles in the same Issue
- Frontmatter
- Material properties
- Effect of nanodiamond particles on the structure, mechanical, and thermal properties of polymer embedded ND/PMMA composites
- A comparative investigation on wear characteristics of polymer and biopolymer gears
- Unsaturated polyester resin modified with a novel reactive flame retardant: effects on thermal stability and flammability
- Recent progress on the morphology and thermal cycle of phase change materials (PCMs)/conductive filler composites: a mini review
- Effect of tiny amount of DMC on thermal, mechanical, optical, and water resistance properties of poly(vinyl alcohol)
- Vibration and tribological properties of epoxy-granite composites used as novel foundations for machine elements
- Effect of lyocell fiber cross-sectional shape on structure and properties of lyocell/PLA composites
- Engineering and processing
- Quality prediction and control of thin-walled shell injection molding based on GWO-PSO, ACO-BP, and NSGA-II
- Doubly modified MWCNTs embedded in polyethersulfone (PES) ultrafiltration membrane and its anti-fouling performance
- Solid-state extrusion of polymers using simple shear deformation
- Molding process and properties of polyimide-fiber-fabric-reinforced polyether ether ketone composites
