Journal
ACS APPLIED POLYMER MATERIALS
Volume 4, Issue 3, Pages 1794-1804Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsapm.1c01622
Keywords
epoxy resin; biobased; flame retardant; mechanical properties; silicon/phosphorus hybrid
Funding
- Jiangsu Province Key RD Program [BE2019111]
- National Key R&D Program of China [2018YFD0600402]
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
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In this study, a eugenol-based flame retardant containing phosphorus and silicon groups was synthesized and used in epoxy resin to improve its fire resistance. The synergistic effect of silicon and phosphorus promoted the formation of a stable carbon residue, creating an effective thermal insulation layer and enhancing the fire resistance of the material.
The fire resistance property of epoxy resin is crucial for its engineering applications. In this work, a eugenol-based flame retardant containing phosphorus (P) and silicon (Si) groups (EGN-Si/P) was synthesized via the Williamson etherification and subsequent hydrosilylation reaction. The resulting EGN-Si/P was used as a flame retardant for bisphenol A epoxy resin (DGEBA). The resulting epoxy resin passed the UL-94 V-0 rating and had a high limiting oxygen index (LOI) value of 28% when only 0.5 wt % Si/P content was introduced into the hybrid system. The results of cone calorimetry tests demonstrated that compared to those of DGEBA, the peak heat release rate and the total heat release of EGN-Si/P reduced by 49.6 and 46.8%, respectively, when 2 wt % Si/P was loaded into the hybrid system. The Si and P synergistically promote the formation of a stable carbon residue, which served as an effective thermal insulation layer to shield the underlying matrix from the exterior heat irradiation. This eugenol-based P and Si synergistic flame retardant opens a pathway to develop sustainable high-performance flame-retardant biobased polymer materials for practical application.
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