Expanded graphite/polydimethylsiloxane composites with high thermal conductivity

Abstract

Expanded graphite (EG)/polydimethylsiloxane (PDMS) composites with high thermal conductivity and high flexibility are prepared in this work. EG derived from natural graphite flake is infiltrated in PDMS prepolymer solution and then hot pressed in a steel mould at 80 8C for 2 h. Optical microscope and scanning electron microscope investigation reveals the interpenetrating network structures in the EG/PDMS composites. When mass fraction of EG increases to 10.0 wt %, the thermal conductivity of EG/PDMS reaches to 4.70 W/m K which should be attributed to the conductive path of graphite platelets. Meanwhile, the composites have excellent flexibility (the compressive modulus is 0.68 Mpa) because of its continuous PDMS network.

High-Thermal-Transport-Channel Construction within Flexible Composites via the Welding of Boron Nitride Nanosheets

“…To illustrate the superiority of the 3D-BNNS network by welding the BNNS, Figure d summarizes the previously reported thermal conductivities of PDMS-based composites (filler ≤ 30 vol %). ,,,,− The 3D-BNNS/PDMS composites by welding of the BNNS exhibit extreme thermal conductivity with similar filler loading or even more. This suggests that building thermal-transport channels by directional freezing and carbonization is an effective way of improving the thermal conductivity of PDMS-based composites.…”

Printable, Highly Sensitive Flexible Temperature Sensors for Human Body Temperature Monitoring: A Review

“…Expanded graphite (EG) is a new type of functional carbon material that loose and porous worm-like substance obtained from natural graphite flakes through intercalation, washing, drying, and high-temperature expansion. The thermal conductivity of the composite formed by hot pressing after the material can reach 4.70 W m −1 K −1 when 10 wt% of EG is impregnated into PDMS prepolymer [66]. Shih et al [67]used PDMS as the base material and graphite powder as the heat-sensitive sensing material, and used the PI film through the printing process produced a flexible temperature sensor array composed of Gr/PDMS composite sensors (show in Fig.…”

Laterally-resolved mechanical and tribological properties of laser-structured polymer nanocomposites

“…Alumina [4], molybdenum disulfide [5] and carbon-based nanomaterials such as graphite [6], carbon nanotubes [7], and graphene [7] have been previously used to prepare polymer nanocomposites with enhanced mechanical properties. Particularly, polymers reinforced with carbon nanomaterials have shown a significant improvement not only in their mechanical properties [8], but also in their electrical [9] and thermal [10] conductivities, and their barrier impermeability to vapors and gases [11].…”