TY  - JOUR
AU  - Zhong, An
AU  - Xie, Congzhen
AU  - Gou, Bin
AU  - Zhou, Jiangang
AU  - Xu, Huasong
AU  - Yu, Song
AU  - Zhang, Daoming
AU  - Bi, Chunhui
AU  - Cai, Hangchuan
AU  - Li, Licheng
AU  - Wang, Rui
PY  - 2024
TI  - Recyclable Technology of Thermosetting Resins for High Thermal Conductivity Materials Based on Physical Crushing
JO  - Energy & Environmental Materials
SN  - 2575-0348
VL  - 7
IS  - 6
AB  - Epoxy resin, characterized by prominent mechanical and electric-insulation properties, is the preferred material for packaging power electronic devices. Unfortunately, the efficient recycling and reuse of epoxy materials with thermally cross-linked molecular structures has become a daunting challenge. Here, we propose an economical and operable recycling strategy to regenerate waste epoxy resin into a high-performance material. Different particle size of waste epoxy micro-spheres (100–600 μm) with core-shell structure is obtained through simple mechanical crushing and boron nitride surface treatment. By using smattering epoxy monomer as an adhesive, an eco-friendly composite material with a “brick-wall structure” can be formed. The continuous boron nitride pathway with efficient thermal conductivity endows eco-friendly composite materials with a preeminent thermal conductivity of 3.71 W m−1 K−1 at a low content of 8.5 vol% h-BN, superior to pure epoxy resin (0.21 W m−1 K−1). The composite, after secondary recycling and reuse, still maintains a thermal conductivity of 2.12 W m−1 K−1 and has mechanical and insulation properties comparable to the new epoxy resin (energy storage modulus of 2326.3 MPa and breakdown strength of 40.18 kV mm−1). This strategy expands the sustainable application prospects of thermosetting polymers, offering extremely high economic and environmental value.
UR  - https://doi.org/10.1002/eem2.12762
DO  - 10.1002/eem2.12762