Gas Barrier, Thermal, Mechanical and Rheological Properties of Highly Aligned Graphene-LDPE Nanocomposites
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 arr...
Main Authors: | , , , , |
---|---|
Format: | Article |
Language: | English |
Published: |
MDPI AG
2017-07-01
|
Series: | Polymers |
Subjects: | |
Online Access: | https://www.mdpi.com/2073-4360/9/7/294 |
id |
doaj-ad43b4a8efa5455c9387ad41e723b375 |
---|---|
record_format |
Article |
spelling |
doaj-ad43b4a8efa5455c9387ad41e723b3752020-11-24T20:42:45ZengMDPI AGPolymers2073-43602017-07-019729410.3390/polym9070294polym9070294Gas Barrier, Thermal, Mechanical and Rheological Properties of Highly Aligned Graphene-LDPE NanocompositesKarolina Gaska0Roland Kádár1Andrzej Rybak2Artur Siwek3Stanislaw Gubanski4Department of Electrical Engineering, Chalmers University of Technology, 41296 Gothenburg, SwedenDepartment of Industrial and Materials Science, Chalmers University of Technology, 41296 Gothenburg, SwedenABB Corporate Research Center, 31038 Krakow, PolandABB Corporate Research Center, 31038 Krakow, PolandDepartment of Electrical Engineering, Chalmers University of Technology, 41296 Gothenburg, SwedenThis 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.https://www.mdpi.com/2073-4360/9/7/294polymer-matrix compositesrheological propertiesthermal propertiespermeabilityextrusion |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Karolina Gaska Roland Kádár Andrzej Rybak Artur Siwek Stanislaw Gubanski |
spellingShingle |
Karolina Gaska Roland Kádár Andrzej Rybak Artur Siwek Stanislaw Gubanski Gas Barrier, Thermal, Mechanical and Rheological Properties of Highly Aligned Graphene-LDPE Nanocomposites Polymers polymer-matrix composites rheological properties thermal properties permeability extrusion |
author_facet |
Karolina Gaska Roland Kádár Andrzej Rybak Artur Siwek Stanislaw Gubanski |
author_sort |
Karolina Gaska |
title |
Gas Barrier, Thermal, Mechanical and Rheological Properties of Highly Aligned Graphene-LDPE Nanocomposites |
title_short |
Gas Barrier, Thermal, Mechanical and Rheological Properties of Highly Aligned Graphene-LDPE Nanocomposites |
title_full |
Gas Barrier, Thermal, Mechanical and Rheological Properties of Highly Aligned Graphene-LDPE Nanocomposites |
title_fullStr |
Gas Barrier, Thermal, Mechanical and Rheological Properties of Highly Aligned Graphene-LDPE Nanocomposites |
title_full_unstemmed |
Gas Barrier, Thermal, Mechanical and Rheological Properties of Highly Aligned Graphene-LDPE Nanocomposites |
title_sort |
gas barrier, thermal, mechanical and rheological properties of highly aligned graphene-ldpe nanocomposites |
publisher |
MDPI AG |
series |
Polymers |
issn |
2073-4360 |
publishDate |
2017-07-01 |
description |
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. |
topic |
polymer-matrix composites rheological properties thermal properties permeability extrusion |
url |
https://www.mdpi.com/2073-4360/9/7/294 |
work_keys_str_mv |
AT karolinagaska gasbarrierthermalmechanicalandrheologicalpropertiesofhighlyalignedgrapheneldpenanocomposites AT rolandkadar gasbarrierthermalmechanicalandrheologicalpropertiesofhighlyalignedgrapheneldpenanocomposites AT andrzejrybak gasbarrierthermalmechanicalandrheologicalpropertiesofhighlyalignedgrapheneldpenanocomposites AT artursiwek gasbarrierthermalmechanicalandrheologicalpropertiesofhighlyalignedgrapheneldpenanocomposites AT stanislawgubanski gasbarrierthermalmechanicalandrheologicalpropertiesofhighlyalignedgrapheneldpenanocomposites |
_version_ |
1716821906074632192 |