Epoxy modified with polymer-grafted GO: Role of bimodal functionalization in formation of ordered structures

The modification of epoxy with polymer-grafted graphene oxide (GO) is a radical alternative to mere combination of GO with a polymeric modifier. Here, this aspect is revealed for the case of bimodal grafting of GO with hydrophobic polybutadiene and hydrophilic polyoxypropylene or polyethylene glycol...

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Bibliographic Details
Published in:Materials chemistry and physics 2021-11, Vol.272, p.124996, Article 124996
Main Authors: Kelnar, I., Kaprálková, L., Krejčíková, S., Zhigunov, A., Dybal, J., Janata, M.
Format: Article
Language:English
Subjects:
Bimodal grafting
Chain mobility
Epoxy
Grafting
Graphene
Graphene oxide
Lamellar structure
Mechanical properties
Polybutadiene
Polyethylene glycol
Polymers
Polypropylene glycol
Properties
Self assembly
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Summary:The modification of epoxy with polymer-grafted graphene oxide (GO) is a radical alternative to mere combination of GO with a polymeric modifier. Here, this aspect is revealed for the case of bimodal grafting of GO with hydrophobic polybutadiene and hydrophilic polyoxypropylene or polyethylene glycol utilizing grafting-to approach to link different chains in the plane and edge area of GO. The results indicate fair ability of bimodally grafted GO to form ordered lamellar structures in epoxy. However, these structures show larger distance between less aligned GO plates in contrast to tightly aligned GO arrangement in case of single grafting. This is enabled by repulsive interactions between dissimilar chains. Such a structure with higher mobility of grafted chains has favorable effect on mechanical performance of epoxy. The effect of chain type and geometry of grafting is highlighted as well. Important finding is promotion of lamellar structure formation also by grafted low-m. w. compounds. Bimodally grafted GO forms ordered lamellar structures in epoxy with favorable higher mobility of chains. [Display omitted] •Crucial difference between single and bimodally grafted GO ordering in epoxy.•Repulsive interactions between dissimilar chains increase distance between GO plates.•Explanation of the effect of grafting geometry and chain length on structure.•Favorable effect of lamellar structure with higher mobility of chains on properties.
ISSN:0254-0584
1879-3312
DOI:10.1016/j.matchemphys.2021.124996