Type

Journal Article

Authors

Jonathan Coleman
Ignatius Mcgovern
Arlene O'Neill
Umar Khan

Subjects

Chemistry

Topics
functional groups nanoscience materials graphene based materials polymer materials tensile strength polyvinylalcohol pva mechanical properties graphene oxide go

Improving the mechanical properties of graphene oxide based materials by covalent attachment of polymer chains (2013)

Abstract We report on the modification of graphene oxide (GO) with polyvinylalcohol (PVA) leading to the mechanical improvement of GO based materials. First, GO was covalently functionalised with PVA by esterification of carboxylic groups on GO with hydroxyl groups of PVA resulting in functionalised f-(PVA)GO. This was carried out for PVA of six different molecular weights. This functionalised graphene oxide could be formed into a paper-like material by vacuum filtration. Papers prepared from f-(PVA)GO showed significant increases in mechanical properties compared to those prepared with GO or with simple mixtures of GO and PVA. The best performance was achieved for PVA functional groups with molecular weights between 50 and 150 kg/mol. Improvements in Young?s moduli of 60% and tensile strength of 400% were observed relative to GO-only paper. The improved mechanical properties are attributed to enhanced inter-flake stress transfer due to the covalently bonded PVA. Second, functionalised f-(PVA)GO was used as filler in PVA-based composites. The application of a pre-selection method allowed the use of only the largest functionalised f-(PVA)GO flakes. This resulted in substantially reinforced PVA-f-(PVA)GO composites. Both modulus and strength increased by 40% relative to the pure polymer for f-(PVA)GO loadings below 0.3 vol.%.
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Full list of authors on original publication

Jonathan Coleman, Ignatius Mcgovern, Arlene O'Neill, Umar Khan

Experts in our system

1
Jonathan Coleman
Trinity College Dublin
Total Publications: 217
 
2
I T McGovern
Trinity College Dublin
Total Publications: 7
 
3
Arlene O'Neill
Trinity College Dublin
Total Publications: 25
 
4
Umar Khan
Trinity College Dublin
Total Publications: 37