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Studies on the physico-mechanical, thermal, and morphological behaviors of high density polyethylene/coleus spent green composites

Authors

  • Murtuza Ali Syed,

    1. Yenepoya Research Centre, Yenepoya University, Deralakatte, Mangalore 575 018, India
    2. Department of Studies in Polymer Science, University of Mysore, Mandya 571 402, India
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  • Sania Akhtar,

    1. Central Institute of Plastics Engineering and Technology, Mysore 570 016, India
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  • Siddaramaiah,

    1. Department of Polymer Science and Technology, Sri Jayachamarajendra College of Engineering, Mysore 570 006, India
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  • Akheel Ahmed Syed

    Corresponding author
    1. Yenepoya Research Centre, Yenepoya University, Deralakatte, Mangalore 575 018, India
    2. Department of Studies in Chemistry, University of Mysore, Mysore 570 006, India
    • Yenepoya Research Centre, Yenepoya University, Deralakatte, Mangalore 575 018, India
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Abstract

This study is aimed at utilizing nutraceutical industrial waste and reducing carbon footprints of plastics. Eco-friendly “green composites” of high density polyethylene (HDPE) were fabricated using coleus spent (CS)—a nutraceutical industrial waste as reinforcing filler and maleic anhydride-graft-polyethylene (MA-g-PE) as compatibilizer. Composites were fabricated with 5, 10, 15, and 20% (w/w) of CS by extrusion method. The fabricated HDPE/CS composites were evaluated for mechanical and thermal behavior. A slight improvement of about 5% in tensile strength and marked improvement of about 25% in tensile modulus for 20 wt % CS filled HDPE composites was noticed. The effect of CS content on rheological behavior was also studied. Thermal characteristics were performed using thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC). TGA thermogram indicated increased thermal stability of CS-filled composites. From TGA curves the thermal degradation kinetic parameters of the composites have been calculated using Broido's method. The enthalpy of melting (ΔHm) obtained from DSC curves was reduced with increase in CS content in HDPE matrix, due to decrease in HDPE content in composite systems. An increase in CS loading increased the water absorption behavior of the composites slightly. Morphological behavior of cryo-fractured composites has been studied using scanning electron microscopy. © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2011

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