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

Karolina Gaska (Institutionen för elektroteknik, Elkraftteknik) ; Roland Kádár (Institutionen för material- och tillverkningsteknik, Polymera material och kompositer) ; Andrzej Rybak ; Artur Siwek ; Stanislaw Gubanski (Institutionen för elektroteknik, Elkraftteknik)
Polymers (2073-4360). Vol. 9 (2017), 7, p. 294.
[Artikel, refereegranskad vetenskaplig]

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.

Nyckelord: polymer-matrix composites; rheological properties; thermal properties; permeability; extrusion



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Denna post skapades 2017-08-07. Senast ändrad 2017-08-07.
CPL Pubid: 250932

 

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Institutioner (Chalmers)

Institutionen för elektroteknik, Elkraftteknik
Institutionen för material- och tillverkningsteknik, Polymera material och kompositer (2005-2017)

Ämnesområden

Materialvetenskap
Kompositmaterial och -teknik
Textil-, gummi- och polymermaterial
Övrig bearbetning/sammanfogning
Funktionella material

Chalmers infrastruktur