Gas Barrier, Thermal, Mechanical and Rheological Properties of Highly Aligned Graphene-LDPE Nanocomposites
Journal article, 2017

This contribution reports on properties of low-density polyethylene-based composites filled with different amounts of graphene nanoplatelets. The studied samples were prepared in the form of films by means of the precoating technique and single screw melt-extrusion, which yields a highly ordered arrangement of graphene flakes and results in a strong anisotropy of composites morphology. The performed tests of gas permeability reveal a drastic decrease of this property with increasing filler content. A clear correlation is found between permeability and free volume fraction in the material, the latter evaluated by means of positron annihilation spectroscopy. A strong anisotropy of the thermal conductivity is also achieved and the thermal conductivity along the extrusion direction for samples filled with 7.5 wt % of GnP (graphene nanoplatelets) reached 2.2 W/m·K. At the same time, when measured through a plane, a slight decrease of thermal conductivity is found. The use of GnP filler leads also to improvements of mechanical properties. The increase of Young’s modulus and tensile strength are reached as the composites become more brittle.

rheological properties

permeability

polymer-matrix composites

extrusion

thermal properties

Author

Karolina Gaska

Chalmers, Energy and Environment, Electric Power Engineering

Roland Kádár

Chalmers, Materials and Manufacturing Technology, Polymeric Materials and Composites

Andrzej Rybak

ABB

Artur Siwek

ABB

Stanislaw Gubanski

Chalmers, Energy and Environment, Electric Power Engineering

Polymers

2073-4360 (eISSN)

Vol. 9 7 294- 294

Subject Categories

Manufacturing, Surface and Joining Technology

Textile, Rubber and Polymeric Materials

Other Materials Engineering

Composite Science and Engineering

Areas of Advance

Materials Science

DOI

10.3390/polym9070294

More information

Latest update

11/4/2022