Synthesis of a phosphorus‑silicone modifier imparting excellent flame retardancy and improved mechanical properties to a rapid cure epoxy
A liquid bi-functional phosphaphenanthrene siloxane molecule that imparts excellent flame-retardancy and improved mechanical properties to an epoxy amine network was identified and synthesized. The modifier was added to a reactive epoxy amine system to create a low viscosity, miscible, flame retarda...
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Veröffentlicht in: | Reactive & functional polymers 2020-12, Vol.157, p.104743, Article 104743 |
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Hauptverfasser: | , , , , , |
Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | A liquid bi-functional phosphaphenanthrene siloxane molecule that imparts excellent flame-retardancy and improved mechanical properties to an epoxy amine network was identified and synthesized. The modifier was added to a reactive epoxy amine system to create a low viscosity, miscible, flame retardant resin potentially able to be manufactured via high-pressure resin transfer molding (HP-RTM). The additive reduced the viscosity of the epoxy resin system, remained miscible in the epoxy resin after cure producing a transparent network while simultaneously enhancing self-extinguishing flame retardancy, flexural properties and fracture toughness. At a concentration of 25%, the viscosity of the modified resin system prior to cure was very low (less than 100 mPa.s at 80 °C), cured rapidly (less than 8 min at 150 °C), exhibited a Tg over 110 °C, displayed improved flexural strength (13%), modulus (23%) and fracture toughness (23%), increased thermal stability and displayed self-extinguishing behaviour (UL 94 V-0). Examination after combustion revealed a transformation to a porous but stable char layer likely a result of the synergistic effects of the silicon and phosphorus. The results presented here using represent a promising development for next generation modified epoxy resin systems targeted towards rapid manufacturing of composite materials using HP-RTM.
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•A liquid bi-functional phosphaphenanthrene siloxane was synthesis, characterized and use t used to modifeepoxy resin after cure.•As modifier for a reactive epoxy resin, although Tg decreases, strength, modulus and toughness are increased.•At 25% network achieves a V0 fire rating while maintaining a low viscosity and reactivity suitable for RTM fabrication technologies. |
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ISSN: | 1381-5148 |
DOI: | 10.1016/j.reactfunctpolym.2020.104743 |