Synthesis of a phosphorus‑silicone modifier imparting excellent flame retardancy and improved mechanical properties to a rapid cure epoxy

Houlei Gan, Seyed Mohsen Seraji, Jane Zhang, Samuel R. Swan, Salumeh Issazadeh, Russell J. Varley

Research output: Contribution to journalArticlepeer-review

24 Citations (Scopus)

Abstract

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.

Original languageEnglish
Article number104743
Number of pages12
JournalReactive and Functional Polymers
Volume157
Early online date26 Sept 2020
DOIs
Publication statusPublished - Dec 2020
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2020 Elsevier B.V.

Funder

Funding Information:
Prof Russell J. Varley gratefully acknowledges funding from the Victoria-Jiangsu Program for Technology and Innovation Program .

ASJC Scopus subject areas

  • Chemistry(all)
  • Environmental Chemistry
  • Biochemistry
  • Chemical Engineering(all)
  • Polymers and Plastics
  • Materials Chemistry

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