期刊
MATERIALS
卷 14, 期 4, 页码 -出版社
MDPI
DOI: 10.3390/ma14040751
关键词
nanocomposites; polymer brushes; graphene oxide; thermal conductivity
类别
资金
- Ministry of Science and Higher Education in Poland
By grafting poly(acrylamide) brushes onto the surface of graphene, GO_PAAM was created to improve the thermal conductivity of polyamide-6 (PA6) nanocomposites. The strong interfacial interactions between the brushes and the PA6 matrix also enhanced the tensile strength of the nanocomposite.
Polyamide-based nanocomposites containing graphene platelets decorated with poly(acrylamide) brushes were prepared and characterized. The brushes were grafted from the surface of graphene oxide (GO), a thermally conductive additive, using atom transfer radical polymerization, which led to the formation of the platelets coated with covalently tethered polymer layers (GO_PAAM), accounting for ca. 31% of the total mass. Polyamide-6 (PA6) nanocomposites containing 1% of GO_PAAM were formed by extrusion followed by injection molding. The thermal conductivity of the nanocomposite was 54% higher than that of PA6 even for such a low content of GO. The result was assigned to strong interfacial interactions between the brushes and PA6 matrix related to hydrogen bonding. Control nanocomposites containing similarly prepared GO decorated with other polymer brushes that are not able to form hydrogen bonds with PA6 revealed no enhancement of the conductivity. Importantly, the nanocomposite containing GO_PAAM also demonstrated larger tensile strength without deteriorating the elongation at break value, which was significantly decreased for the other coated platelets. The proposed approach enhances the interfacial interactions thanks to the covalent tethering of dense polymer brushes on 2D fillers and may be used to improve thermal properties of other polymer-based nanocomposites with simultaneous enhancement of their mechanical properties.
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