High thermal conductivity of self‐healing polydimethylsiloxane elastomer composites by the orientation of boron nitride nano sheets

Abstract

Up to now, low thermally conductive properties and irreversible damage caused by the accidental mechanical failure are still the main negative factors for the wide application of polymer thermal management materials in the microelectronic industry. In this work, we prepared self‐healing polydimethylsiloxane/boron nitride nano sheets (PDMS/BNNSs) composites with high thermal conductivity. PDMS elastomer with the dynamic reversible imine bond acts as the polymer matrix and BNNSs with NH2 in regularly in‐plane arrangement are used as the thermally conductive filler. When the BNNSs filler content is 30 wt%, the thermal conductivity is increased by 588%; The self‐healing efficiency reaches more than 85%, driven by the reversibility of the dynamic imine bond within PDMS; In addition, the tensile strength and the thermal stability exhibit an enhancement of 275% and 31.8°C, respectively, compared to the pure self‐healing PDMS elastomer.

Thermoplastic vulcanizates dynamically cross‐linked by a tailored small molecule

“…5 On the other hand, inspired by nature, some new bionic structures and materials are gradually developed. 6,7 Intense effort has been devoted to incorporating elegant dynamic reversible bonds into cross-linked polymer networks, such as with Diels-Alder bonds, 8,9 metal-ligand coordination, 10 disulfides, 11,12 hydrogen bonds, 13 imine bonds, 14,15 π-π stacking, 16 boronic ester bonds, [17][18][19] and so on. When changing environment, such as temperature, 20,21 light, 22,23 electrical current injection, 24 and other factors, these types of supramolecular chemical bonds can be reversibly broken and reorganized, thus the material is expected to become repairable and plasticizable.…”

A super‐stretched self‐healing silicone elastomer based on high molecular weight polydimethylsiloxanes through intermolecular quadruple hydrogen bonding

“…Polydimethylsiloxane (PDMS) elastomers with excellent high and low temperature resistance, chemical resistance, good biocompatibility and excellent dielectric properties have a wide application value in many fields such as electronic devices, medical health, and surface protection 1–3 . In the course of long‐term use, folding and scratching can cause mechanical damage to the elastomer, thus reducing its stability and durability 4–6 . Therefore, the introduction of self‐healing properties in PDMS elastomers can not only improve its utilization value and save costs but also greatly reduce the safety problems caused by material damage.…”

“…[1][2][3] In the course of long-term use, folding and scratching can cause mechanical damage to the elastomer, thus reducing its stability and durability. [4][5][6] Therefore, the introduction of self-healing properties in PDMS elastomers can not only improve its utilization value and save costs but also greatly reduce the safety problems caused by material damage.…”

Preparation and construction mechanism of thermal conductive epoxy‐based composite via magnetic field induced orientation

“…Hexagonal boron nitride (h‐BN) has excellent thermal conductivity among the different particles. The theoretical calculated thermal conductivity of hexagonal boron nitride nanosheets (h‐BNNSs) is as high as 1700 ~ 2000 (W/m·K) 28–30 . More importantly, BN have good mechanical properties, thermal properties, and chemical stability.…”

“…The theoretical calculated thermal conductivity of hexagonal boron nitride nanosheets (h-BNNSs) is as high as 1700 $ 2000 (W/mÁK). [28][29][30] More importantly, BN have good mechanical properties, thermal properties, and chemical stability. Besides, carbon nanotubes (CNTs) have good mechanical properties and high thermal conductivity.…”