Journal of Polymer Research

, 25:60 | Cite as

Laponite-graphene oxide hybrid particulate filler enhances mechanical properties of cross-linked epoxy

  • Devesh K. Chouhan
  • Arvind Kumar
  • Sangram K. Rath
  • Sanjay Kumar
  • Prasant S. Alegaonkar
  • G. Harikrishnan
  • T. Umasankar Patro
ORIGINAL PAPER
  • 92 Downloads

Abstract

A new hybrid of Laponite and graphene oxide (LGO), prepared in aqueous media by ultrasonication followed by solvent evaporation was used to reinforce epoxy matrix. The hybrid system was dispersed in liquid epoxy using a two-step solvent-assisted process. The suspensions showed negligible enhancements in processing barrier as revealed by rheology. A combinatorial analysis of small-angle x-ray scattering (SAXS) and microscopy suggested uniform dispersion of nanofillers in the matrix. The fillers showed fractal dimensions in polymer matrix as inferred from SAXS studies. Below 0.5 wt% LGO, the structure showed surface fractal and above 0.5 wt% the composites showed mass fractal, indicating a transformation from well-dispersed to agglomerated composites as the filler content increases. The composites exhibited substantial improvements in various mechanical properties. Notably, the flexural strength and modulus increased by ~23% and ~29%, respectively, with only 0.5 wt% LGO and the fracture toughness showed an increment of ~23% with 0.3 wt% LGO in epoxy matrix. A bimodal distribution of glass transition temperature (T g ) with improved T g was obtained for the composites. The simultaneous strengthening and toughening effects of nanofillers are explained by means of fractography.

Keywords

Nanocomposites Mechanical properties Graphene oxide Laponite 

Notes

Acknowledgements

TUP would like to thankfully acknowledge lab facilities and financial support from DIAT (DIAT/F/MATE/4845/TUP) and the funding from DST under Fast Track Project for Young Scientist (SB/FT/CS-043/2012). We would like to thank Dr. R. K. Goyal, COEP, Pune for TGA studies. The funding from DRDO–DIAT Program on Nanomaterials by ER-IPR, DRDO is thankfully acknowledged.

Supplementary material

10965_2018_1461_MOESM1_ESM.docx (3 mb)
ESM 1 (DOCX 3065 kb)

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Copyright information

© Springer Science+Business Media B.V., part of Springer Nature 2018

Authors and Affiliations

  1. 1.Department of Materials EngineeringDefence Institute of Advanced TechnologyPuneIndia
  2. 2.Department of Metallurgical and Materials EngineeringIndian Institute of Technology KharagpurWest BengalIndia
  3. 3.Department of Applied PhysicsDefence Institute of Advanced TechnologyPuneIndia
  4. 4.Department of ChemistryIndian Institute of Science and Educational Research BhopalBhopalIndia
  5. 5.Polymer Division, Naval Materials Research LaboratoryDefence Research & Development Organization, AmbernathThaneIndia
  6. 6.Department of Chemical EngineeringIndian Institute of TechnologyKharagpurIndia

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