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Montmorillonite clay addition to epoxy/unsaturated polyester blended composites: effect on thermal and chemical properties

Chavali SSS Murthy, KVP Chakradhar, VA Kumar, PRithvi Rajan


Montmorillonite (MMT) clay was disseminated into Unsaturated Polyester (UP) and Epoxy blend systems in diverse weight ratios namely, 0, 1, 2, 3, and 5% to prepare Epoxy/UP/ MMT clay composite. The specimen was characterized by thermal and chemical analysis. A homogeneous mixture of blended composites is obtained through mechanical stirring and ultrasonication processes. The testing of thermal and chemical properties was as per ASTM standards. Evidence acquired from the above tests indicates that Epoxy reinforced with UP and further strengthened with MMT clay enhanced the thermal and chemical properties of the composite to a considerable extent. The purpose of this study was to recognize an appropriate composite offering a stronger material with enhanced performance; that is suitable for diverse industrial uses. TGA data revealed that clay content does not affect the heat stability at 5 wt.% in comparison to pure and other combinations blends. With every rise of 10°C in degradation temperature 15% weight loss was noted; while a 4°C fall in Tg is seen in DSC analysis for 5 wt. % clay combinations. The thermal properties of the clay-filled composite are perceived to increase gradually and are observed to be the highest at 5 wt. % in comparison to other variants.


Montmorillonite clay, Epoxy, Unsaturated polyester, Thermal properties, Chemical properties.

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