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Novel BN‐epoxy/anhydride composites with enhanced thermal conductivity
Author(s) -
Isarn Isaac,
Ferrando Francesc,
Serra Àngels,
Urbina Cristina
Publication year - 2021
Publication title -
polymers for advanced technologies
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.61
H-Index - 90
eISSN - 1099-1581
pISSN - 1042-7147
DOI - 10.1002/pat.5184
Subject(s) - materials science , epoxy , composite material , curing (chemistry) , agglomerate , boron nitride , percolation threshold , thermal conductivity , rheology , electrical resistivity and conductivity , engineering , electrical engineering
A new series of high thermal boron nitride (BN) composites are prepared and characterized by several techniques. They are formed by an epoxy‐anhydride matrix and different BN contents, ranging from 30 to 80 wt%, of 120 μm agglomerates. For high BN ratio (≥60 wt%), epoxy mixtures were compressed (75 MPa) during 1 minute before curing, eliminating voids due to the high increase of viscosity, improving the compactness of the material and enhancing the thermal conductivity (TC). The curing process evolution was studied by calorimetric measurements to see if there was an influence of the filler on the curing rate. Rheological tests were performed to obtain the percolation threshold. It was observed that BN filler did not affect negatively the thermomechanical properties of the materials and allowed to enhance the TC from 0.17 W/m K in the case of the neat epoxy, to 3.06 W/m K when 80 wt% of BN agglomerates were added, which represents an improvement of 1700%.