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The development of rubber-thermoplastic blends from ground tyre rubber and waste polypropylene

Authors:

S.M. Egodage ,

University of Loughborough, LK
About S.M.

Department of Materials, Faculty of Science, University of Loughborough, Leicestershire, UK.

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J.F. Harper,

University of Loughborough, GB
About J.F.
Department of Materials, Faculty of Science, University of Loughborough, Leicestershire, UK.
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S. Walpalage

University of Moratuwa, LK
About S.
Department of Chemical & Process Engineering, Faculty of Engineering, University of Moratuwa, Katubedda, Moratuwa
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Abstract

Ground Tyre Rubber (GTR) from scrap automotive and truck tyres was blended with Waste Polypropylene (WPP) from injection moulded products to prepare GTR/WPP blends. The blends were prepared in a Haake Rheocord PolyLab System, operating at 180 0C and 30 rpm for 8 minutes. The degree of crystallinity of the WPP in the GTR/WPP blend was found to be unchanged up to a GTR level of 60 % by weight. Crystalline melting point and re-crystallization temperature showed a significant decrease with GTR content. Optical micrograph of the blends containing up to 60 wt% GTR showed a similar morphology, in which the GTR was dispersed in a continuous WPP phase. The GTR dispersed phase grew in size with GTR content until at 70 wt%, it changed to a continuous phase. However, all blends showed a mixture of cohesive, adhesive and ductile failures. The response to tensile loading ranged from a ductile plastic response with WPP-rich blends to a high extension–rubbery response with GTR-rich blends. Under impact loads, brittle fracture occurred in blends containing up to 40 wt% GTR, with ductile fracture thereafter. Hardness, tensile strength, secant modulus at 7% strain and tear resistance decreased with increase in GTR content, while % elongation at break and impact failure energy increased.

Keywords: Ground tyre rubber, mechanical properties, rubber thermoplastic blends, waste polypropylene

 

doi :10.4038/jnsfsr.v37i2.1067

 

J.Natn.Sci.Foundation Sri Lanka 2009 37 (2):117-123

 

 

 

 

How to Cite: Egodage, S.M., Harper, J.F. and Walpalage, S., 2009. The development of rubber-thermoplastic blends from ground tyre rubber and waste polypropylene. Journal of the National Science Foundation of Sri Lanka, 37(2), pp.117–123. DOI: http://doi.org/10.4038/jnsfsr.v37i2.1067
Published on 30 Jun 2009.
Peer Reviewed

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