Mechanical properties of wood–fiber reinforced polypropylene composites: Effect of a novel compatibilizer with isocyanate functional group

Karmarkar, Ajay and Chauhan, SS and Modak, Jayant M and Chanda, Manas (2007) Mechanical properties of wood–fiber reinforced polypropylene composites: Effect of a novel compatibilizer with isocyanate functional group. In: Composites Part A : Applied Science and Manufacturing, 38 (2). pp. 227-233.

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Abstract

Natural fibers are increasingly being used as reinforcement in commercial thermoplastics due to their low cost, high specific properties and renewable nature. While the maleic anhydride modified polypropylene (MAPP) is most commonly used as compatibilizer to improve interfacial adhesion between hydrophilic wood–fibers and hydrophobic polypropylene, in this study, a novel compatibilizer (m-TMI-g- PP) with isocyanate functional group was synthesized by grafting m-isopropenyl-\alpha,\alpha-dimethylbenzyl-isocyanate (m-TMI) onto isotactic polypropylene (PP) in a twin screw extruder. The effect of filler concentration on the mechanical properties of wood–fiber filled composites, prepared by using m-TMI-g-PP as the compatibilizer, was investigated. The addition of the compatibilizer resulted in greater reinforcement of composites, as indicated by the improvement in mechanical properties. Tensile strength of composites so prepared increased by almost 45%, whereas 85% increase in flexural properties was observed. However the addition of wood–fibers resulted in a decrease in elongation at break and impact strength of the composites.

Item Type:	Journal Article
Publication:	Composites Part A : Applied Science and Manufacturing
Publisher:	Elsevier
Additional Information:	Copyright of this article belongs to Elsevier.
Keywords:	A. Wood polypropylene composites;B. Interphase;E. Extrusion;D. Mechanical properties
Department/Centre:	Division of Mechanical Sciences > Chemical Engineering
Date Deposited:	23 Jun 2007
Last Modified:	19 Sep 2010 04:36
URI:	http://eprints.iisc.ac.in/id/eprint/10241

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