Gas Barrier, Thermal, Mechanical and Rheological Properties of Highly Aligned Graphene-LDPE Nanocomposites
Artikel i vetenskaplig tidskrift, 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.

extrusion

permeability

thermal properties

polymer-matrix composites

rheological properties

Författare

Karolina Gaska

Chalmers, Energi och miljö, Elkraftteknik

Roland Kádár

Chalmers, Material- och tillverkningsteknik, Polymera material och kompositer

Andrzej Rybak

ABB Group, Poland

Artur Siwek

ABB Group, Poland

Stanislaw Gubanski

Chalmers, Energi och miljö, Elkraftteknik

Polymers

2073-4360 (eISSN)

Vol. 9 294- 294

Ämneskategorier

Bearbetnings-, yt- och fogningsteknik

Textil-, gummi- och polymermaterial

Annan materialteknik

Kompositmaterial och -teknik

Styrkeområden

Materialvetenskap

DOI

10.3390/polym9070294