Establishment of highly effective flame‐retardant unsaturated polyester resin system based on multiple strategies

Abstract

Considered that unsaturated polyester resin (UPR) as one of the most commonly used thermoset materials often exhibit severe fire hazards, graphene can be used to act as barriers to enhance the flame retardancy of UPR. However, graphene easily shows irreversible aggregation when being introduced into polymer matrix, which limits its further application in industry. In this work, we synthesized a novel organophosphorus oligomer (DHP), which contained double bond and multivalent phosphorus (−1 and +5) with highly effective flame retardancy, onto graphene oxide via in situ atom-transfer radical polymerization (ATRP). Then, the obtained graphene-DHP was incorporated into UPR matrix by curing. The homogeneous dispersion of graphene-DHP in UPR matrix was confirmed by transmission electron microscopy (TEM). The addition of 2.0 wt% graphene-DHP significantly improved the flame retardancy of UPR/graphene-DHP nanocomposites, which was demonstrated by the peak of heat release rate (PHRR) decreased by 41.79%. Moreover, it is found that graphene-DHP in nanocomposites cannot only act as barriers, but also catalyze the char formation in condensed phase as well as capture free radicals in gaseous phase.This work provides a feasible approach to combine graphene and phosphoruscontaining flame retardant and would also trigger more scientific interest in exploiting new type nanocomposites for flame retardants. K E Y W O R D S fire retardancy, functionalized graphene, in situ atom-transfer radical polymerization, unsaturated polyester resin | 2675 JIANG et Al.

Effect of benzotriazole‐protected platinum catalyst on flame retardancy and ceramic‐forming property of ceramifiable silicone rubber

“…The C1s binding energy of (Pt/BTA)‐0 and (Pt/BTA)‐3 was as shown in Figure 10C,D, 284, 284.8, 286.1, and 289 eV corresponding to CSi, CC, CO, and CO, respectively 27,28 . Peaks of C1s at 284 eV (CSi) and 284.8 (CC) became stronger after adding Pt/BTA, while peaks at 286.1 eV (CO) and 289 eV (CO) became weaker.…”

Fire-retardant unsaturated polyester thermosets: The state-of-the-art, challenges and opportunities

“…Bautista et al reported a highly fire-retardant UP that achieved an LOI of 51% by combining 5 wt% of caged silsesquioxane oligomers and 55 wt% of ATH because of the high thermal stability of the compound containing Si-O type bonds in the structure [120]. Jiang et al [118] used an organophosphorus oligomer to functionalize GO (Fig. 11b), and only 2 wt% of functionalized GO reduced the PHHR of UP by 42%.…”

A Review on the Contemporary Development of Composite Materials Comprising Graphene/Graphene Derivatives

“…In addition, Gr has been used to enhance the fire retardancy of thermoset materials such as UPR. Jiang et al [137] first synthesized a novel organophosphorus oligomer (DHP) and then prepared the G-DHP composite material. e introduction of 2.0 wt.% G-DHP significantly enhanced the fire retardancy of the UPR matrix, which was demonstrated by a 41.79% decrease in the peak exothermic rate (PHRR).…”