TY - JOUR
T1 - Graphene-based Polymer Composite Films with Enhanced Mechanical Properties and Ultra-high In-plane Thermal Conductivity
AU - Tarhini, A. A.
AU - Tehrani-Bagha, A. R.
PY - 2019/11/10
Y1 - 2019/11/10
N2 - Graphene has very high electrical and thermal conductivities and thus is a promising candidate for use as a filler to enhance the conductivity of polymer composites. The main challenge is properly dispersing and aligning graphene nanoflakes (GNFs) within a polymer matrix. We report here a simple and scalable solution mixing and molding process to make such a composite film. These films were analyzed using SEM, ATR-FTIR, XRD, DSC, and TGA. An optical tensiometer and a laser flash analyzer were used to measure the water contact angle and in-plane thermal diffusivity of the films, respectively. The poly(vinylidene fluoride-co-hexafluoropropylene) composite films had an in-plane thermal conductivity (κ) that reached a new record of ∼25 W m-1 K-1 at a GNF concentration of 20 wt%. The presence of GNFs had a noticeable effect on the surface morphology, crystal structure, and hydrophobicity of the polymer matrix. The tensile strength and Young's modulus of the composite films increased by the addition of GNFs up to 20 wt%. The composite films showed very high electrical conductivity due to the presence of highly conductive graphene layers. This manufacturing process ensured the in-plane orientation of graphene layers, which allowed the transport of phonons and electrons through the composite films.
AB - Graphene has very high electrical and thermal conductivities and thus is a promising candidate for use as a filler to enhance the conductivity of polymer composites. The main challenge is properly dispersing and aligning graphene nanoflakes (GNFs) within a polymer matrix. We report here a simple and scalable solution mixing and molding process to make such a composite film. These films were analyzed using SEM, ATR-FTIR, XRD, DSC, and TGA. An optical tensiometer and a laser flash analyzer were used to measure the water contact angle and in-plane thermal diffusivity of the films, respectively. The poly(vinylidene fluoride-co-hexafluoropropylene) composite films had an in-plane thermal conductivity (κ) that reached a new record of ∼25 W m-1 K-1 at a GNF concentration of 20 wt%. The presence of GNFs had a noticeable effect on the surface morphology, crystal structure, and hydrophobicity of the polymer matrix. The tensile strength and Young's modulus of the composite films increased by the addition of GNFs up to 20 wt%. The composite films showed very high electrical conductivity due to the presence of highly conductive graphene layers. This manufacturing process ensured the in-plane orientation of graphene layers, which allowed the transport of phonons and electrons through the composite films.
KW - Graphene
KW - Mechanical Properties
KW - Polymeric composite
KW - Thermal conductivity
UR - http://www.scopus.com/inward/record.url?scp=85072778337&partnerID=8YFLogxK
U2 - 10.1016/j.compscitech.2019.107797
DO - 10.1016/j.compscitech.2019.107797
M3 - Article
AN - SCOPUS:85072778337
SN - 0266-3538
VL - 184
JO - Composites Science and Technology
JF - Composites Science and Technology
M1 - 107797
ER -