Effect of sodium dodecylbenzene sulphonate modifier and PP-g-MA on the morphology and thermal conductivity of PP/EG composites

Lesley Tsitsi Mukwada, Mokgaotsa Jonas Mochane, Tshwafo Elias Motaung*, Setumo Victor Motloung, Lehlohonolo Fortune Koao

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

This study investigates the influence of expanded graphite (EG) and sodium dodecylbenzene sulfonate (SDBS) treated EG (SDBS/EG) on the structure, thermal stability and thermal conductivity of polypropylene (PP) and polypropylene/maleic anhydride-grafted polypropylene (PP/MAPP) blend. The dispersion of EG and SDBS/EG was characterized by scanning electron microscopy (SEM). The SDBS-EG showed a crushed and randomly deformed structure. There was an improved interfacial adhesion between the polymer and the SBDS-EG particles. The graphite dispersed much better with less restacking for PP/MAPP/SDBS/EG system. The better dispersion also contributed towards the improved compatibility between the PP or PP/MAPP and SBDS/EG. The SDBS functionalised EG composites showed better thermal stability than the non-functionalized SDBS composites. It was further shown that the functionalized graphite significantly improved the thermal conductivity of the PP and PP/MAPP. This is because the functionalized SDBS/EG seemed to improve the interfacial heat transfer between the conductive filler (EG) and PP matrix.

Original languageEnglish
Pages (from-to)469-475
Number of pages7
JournalPlastics, Rubber and Composites
Volume46
Issue number10
DOIs
Publication statusPublished - 26 Nov 2017

Keywords

  • Polymer blends
  • composites
  • expanded graphite
  • thermal conductivity

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