Volume : III, Issue : XI, November - 2014

Comparative Rheology of Graphene–PS and Graphene–PMMA nanocomposites

Manasi Singhi, M. Fahim

Abstract :

Graphene filled polymer nanocomposites have attracted a keen interest in the recent past owing to their better structural, morphological, electrical and rheological properties compared to the base polymeric matrices. In this paper, rheological properties of two commercially important polymers viz. PMMA and PS have been investigated and compared firstly, to study the influence of graphene and secondly, to find an optimum percentage of graphene required for best possible rheological properties in both the systems. Frequency sweep measurements were done to study the linear viscoelastic properties of both the systems at a fixed strain. A noticeable nonlinear region at higher strain amplitudes was observed which was attributed to the formation of more strain–sensitive rigid network–like structures which rupture at higher strain amplitudes, leading to a narrower region of linear viscoelasticity. Nanocomposites containing higher graphene percentage were predominated by network like structures compared to the pure polystyrene. Cole–Cole plot of Polystyrene–Graphene nanocomposites showed a deviation from a semi–circular shape with increasing graphene concentration. It was attributed to the fact that at low graphene concentration, polymer–filler interaction is high due to proper exfoliation of graphene into polymer matrix. With increasing nano filler percentage, exfoliation becomes difficult and filler–filler interaction predominated over polymer–filler interaction. It was also observed that crossover frequencies decreased and characteristic relaxation time increased with increasing graphene content in graphene–PS system.

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Article: Download PDF   DOI : 10.36106/ijsr  

Cite This Article:

Manasi Singhi,M. Fahim Comparative Rheology of Graphene-PS and Graphene-PMMA nanocomposites International Journal of Scientific Research, Vol : 3, Issue : 11 November 2014


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