Influence of curing agent and compatibilizer on the physicomechanical properties of polypropylene/nitrile butadiene rubber blends investigated by positron annihilation lifetime technique

Soares, B. G. and Almeida, M. S. M. and Deepa Urs, M. V. and Kumaraswamy, G. N. and Ranganathaiah, C. and Siddaramaiah and Mauler, R. (2006) Influence of curing agent and compatibilizer on the physicomechanical properties of polypropylene/nitrile butadiene rubber blends investigated by positron annihilation lifetime technique. Journal of Applied Polymer Science, 102 (5). pp. 4672-4681. ISSN 1097-4628

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Official URL: https://doi.org/10.1002/app.24497

Abstract

Abstract A series of thermoplastic vulcanizates of polypropylene (PP)/nitrile butadiene rubber (NBR) (50/50) have been prepared by melt-mixing method, using phenolic resin/SnCl2 as the curing system and maleic anhydride-functionalized PP (PP-g-MA) and carboxylated NBR (NBRE-RCOOH) as the compatibilizing system. Triethylenetetramine was also employed to promote the reaction between the functionalized polymers. The effects of curing agent and compatibilizer on the mechanical and morphological properties have been studied. A novel technique based on positron annihilation lifetime spectroscopy has been used to measure the free volume parameters of these systems. The positron results showed minimum free volume size and free volume fraction at 5.0% of the curing agent suggesting some crosslinking in the rubber phase. The reduction in free volume holes at 2.5% of the compatibilizer is interpreted as improvement in the interfacial adhesion between the components of the blend. The observed variation of free volume fraction is opposite to the tensile strength and exhibits the correlation that, lesser the free volume more is the tensile strength at 2.5% of the compatibilizer in the blend. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 102: 4672–4681, 2006

Item Type: Article
Uncontrolled Keywords: polypropylene/nitrile butadiene rubber, thermoplastic vulcanizate, compatibilizer, mechanical properties, ortho-positronium, free volume
Subjects: D Physical Science > Physics
Divisions: Department of > Physics
Depositing User: LA manjunath user
Date Deposited: 08 Aug 2019 05:24
Last Modified: 08 Aug 2019 05:24
URI: http://eprints.uni-mysore.ac.in/id/eprint/6222

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