Recyclable, malleable and intrinsically flame-retardant epoxy resin with catalytic transesterification.

Jia-Hui Chen, Jia-Hui Lu, Xiao-Lu Pu, Li Chen, Yu-Zhong Wang

Chemosphere 2022 May

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Flame retardancy and recyclability are two important issues in the research field of thermosets, particularly for epoxy resin (EP) with the biggest market share. It is of great importance, but rarely achievable, to integrate these properties simultaneously into EP. Herein, we report a facile way to prepare intrinsically flame-retardant epoxy vitrimers combining rapid recycling and multiple shape memory effects by introducing dynamic ester-linkages with catalytic transesterification activity into the crosslinking networks of EP. The flame-retardant epoxy vitrimers exhibited high Tg (∼110.7 °C), desirable thermal stability and excellent flame retardancy with UL-94 V-0 rating, and high LOI of ∼34%. Also, the value of the peak heat release rate (PHRR) and the total heat release (THR) showed 63% and 32% reduction, respectively. Meanwhile, flame-retardant epoxy vitrimers showed high malleability that could be reprocessed in 15 min at 200 °C without sacrificing the mechanical properties and flame retardancy. Moreover, the dynamic transesterification network allowed flame-retardant EP to access multiple shape memory effect. The design of flame-retardant epoxy vitrimers provide a prime example to foster the cyclic utilization of flame-retardant thermosetting polymers. Copyright © 2022 Elsevier Ltd. All rights reserved.

Citation

Jia-Hui Chen, Jia-Hui Lu, Xiao-Lu Pu, Li Chen, Yu-Zhong Wang. Recyclable, malleable and intrinsically flame-retardant epoxy resin with catalytic transesterification. Chemosphere. 2022 May;294:133778