Fabrication of Polyamide 6 Nanocomposite with Improved Thermal Conductivity and Mechanical Properties via Incorporation of Low Graphene Content

Abstract

A 3D graphene network was constructed in polyamide 6 (PA6) monomers through the reduction and self-assembly of graphene oxide (GO), and then PA6 nanocomposites with low graphene content were fabricated through in situ polymerization. The effects of the 3D graphene network on the structure and properties of the PA6 were systematically investigated. Results show that the 3D graphene network can significantly improve the thermal conductivity of PA6. In the case of the PA6 with only 0.25 wt % graphene, its thermal conductivity is 0.69 W/(m K), about 2.88 times of that of the pure PA6. This improvement is attributed to the more-compact thermal conductive paths of the 3D graphene network, and its stronger interfacial interaction with PA6 in this work compares with those of pre-synthesized free-standing 3D graphene networks. Moreover, the mechanical properties and water resistance of PA6 also have significantly improved with the incorporation of the 3D graphene network.

In situ synthesis of hydroxyapatite nanorods on graphene oxide nanosheets and their reinforcement in biopolymer scaffold

“…When the mass fraction continued to increase to 16%, large amounts of aggregation were formed, and even apparently continuous phases appeared, indicating that the dispersion was poor under this proportion of load. In previous study, GO and HAP were prone to agglomeration when they were mixed with polymers [36] , [37] . GO tended to form irreversible agglomerates in the polymer matrix due to the strong van der Waals force among them, and the aggregation of HAP nano particles in the polymer matrix was ascribed to high surface energy as well as large surface area [36] , [38] .…”

“…In previous study, GO and HAP were prone to agglomeration when they were mixed with polymers [36] , [37] . GO tended to form irreversible agglomerates in the polymer matrix due to the strong van der Waals force among them, and the aggregation of HAP nano particles in the polymer matrix was ascribed to high surface energy as well as large surface area [36] , [38] . However, for the GO-HAP nanocomposite produced by the in situ growing method, HAP nanorods uniformly grew on the surface of GO [22] .…”

Fabrication of high mechanical performance UHMWPE nanocomposites with high‐loading multiwalled carbon nanotubes

“…DMA is a useful technique to analyze the viscoelastic nature (dynamic modulus and damping behavior) of a polymeric material, providing information about the structures and viscoelastic behavior of polymeric materials to determine their relevant stiffness and damping characteristics for some kinds of applications …”

Preparation and characterization of hexamethylenediamine-modified graphene oxide/Co-polyamide nanocomposites

“…At the same time, the elongation at break increased from 337.6% to 480.4%, compared with pure CO-PA, increased by 42.3%. Wang et al 38 also prepared GO-PA6 composites. The results showed that when the loading of GO was 0.25 wt%, the tensile strength was increased by 50.9% compared with pure PA6.…”