Synergistic modification of epoxy resin with biomass flame retardants and mullite fibers: research on flame retardancy, thermal insulation, and mechanical properties

Research Overview: A study published in Polymer Testing, Volume 163 (October 2026), by Guo Yongliang、He Rong、Liu Fang、Zhang Yajuan、Yu Bin、Wang Wenpeng、Gou Hao The topic is the synergistic modification of epoxy resin by biomass flame retardants and mullite fibers. The research revolves around three main themes: flame retardancy, thermal insulation, and mechanical properties, and belongs to the formulation and performance research of epoxy system multi performance collaborative design.

Facts and Data Points

• The matrix is epoxy resin, and the modified components include biomass derived flame retardants and mullite fibers.

  . The performance dimensions investigated in the study are flame retardancy, thermal insulation, and mechanical properties. The research adopts a combination of “biomass flame retardant+mullite fiber” instead of single filler modification.

It should be noted that the source only provides information on the title, journal issue, author, and publication time, and does not provide specific flame retardant grades, ultimate oxygen index, thermal conductivity values, and mechanical strength data. Therefore, this article does not provide any quantitative description of the above indicators.

Significance for the polymer additive industry

From the perspective of formulation design, the value of this study lies in treating the two requirements of “flame retardancy” and “insulation” in the same epoxy system.

. For professionals in polymer additives, this means that the selection of fillers and additives needs to be balanced under multi-objective constraints: biomass flame retardants play a role in coalescing and inhibiting heat release, while mullite fibers may affect droplet behavior, char layer strength, and heat conduction pathways. The interface state of the combination of the two will directly determine the final performance. This approach is consistent with the methodology in the field of polymer aging and stabilization. The epoxy system will undergo thermal and photo oxidative aging during long-term use. If fibers and biomass fillers are introduced into the formula, the interface area often becomes the starting point of aging. Therefore, weather resistant and stable design cannot rely solely on a single component. In practice, antioxidant systems are often used in combination with photostable components: the main antioxidant and auxiliary antioxidant form an antioxidant system to suppress processing and long-term thermal oxidative degradation, HALS is used to capture free radicals generated by photooxidation, and UVA reduces the rate of photo initiation by shielding UV radiation. For epoxy composite materials under outdoor or high-temperature conditions, the design of the composite system also needs to consider the influence of fillers on the migration and distribution of light stabilizers. Furthermore, flame retardancy and stabilization are not independent of each other. The pyrolysis behavior of biomass flame retardants can alter the thermal oxidative aging pathway of the system, while the addition of mullite fibers may change the way heat is transferred and accumulated, thereby affecting the consumption rate of the antioxidant system. Therefore, in formula development, flame retardant efficiency, thermal insulation performance, and weather stability life should be evaluated under the same framework, rather than simply stacking them after optimization.

Insights from Detection and Characterization

This study involves three types of properties: flame retardancy, thermal insulation, and mechanical properties, with corresponding characterizations typically including combustion testing, heat conduction related testing, and mechanical testing.

. For stabilization research, thermal analysis can also be combined to evaluate the oxidation induction period and thermal weight loss behavior to determine the effectiveness of the antioxidant system; For outdoor application scenarios, the synergistic effect of HALS and UVA can be evaluated through artificial accelerated aging and spectral characterization. It should be emphasized that the above characterization suggestions are an extended discussion at the method level, and the source text does not provide relevant testing details and results.

Conclusion

This study suggests that the multifunctionality of epoxy systems is shifting from “single additive efficiency enhancement” to “filler additive interface” system design.

. For the polymer additive industry, the intersection of flame retardant, thermal insulation, and weather stability requirements will promote the refined application of antioxidant systems, HALS, UVA, and composite systems in epoxy composite materials, and also require formulators to establish a closer correspondence between aging mechanisms and performance evaluation.

Information source:A bio-mass flame retardant combined with mullite fiber endowing performances for epoxy: flame retardancy, thermal insulation and mechanical property， Organized by Herun Chemical.