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Polymers 2017, 9(2), 63; doi:10.3390/polym9020063

Chemical Modification of Butyl Rubber with Maleic Anhydride via Nitroxide Chemistry and Its Application in Polymer Blends

1
Centro de Investigación en Química Aplicada (CIQA), Blvd. Enrique Reyna 140, Saltillo 25294, Mexico
2
Advanced Functional Materials & Nanotechnology Group, Centro de Investigación en Materiales Avanzados (CIMAV-Unidad Monterrey), Av. Alianza Norte 202, Autopista Monterrey-Aeropuerto Km 10, PIIT, Apodaca 66628, Mexico
3
Department of Chemical Engineering, University of Texas at Austin, 1 University Station C0400 Austin, Austin, TX 78712-0231, USA
*
Author to whom correspondence should be addressed.
Academic Editor: Graeme Moad
Received: 24 November 2016 / Revised: 26 January 2017 / Accepted: 6 February 2017 / Published: 20 February 2017
View Full-Text   |   Download PDF [2495 KB, uploaded 20 February 2017]   |  

Abstract

Butyl rubber (isobutylene–isoprene–rubber, IIR) was functionalized in solution with a nitroxide moiety taking advantage of the unsaturations present in the isoprene units of IIR, and was further grafted with maleic anhydride (MA) or styrene–MA (SMA) to produce IIR-g-MA and IIR-g-SMA. In one of the functionalization techniques used, the molecular structure of the IIR was preserved as the chain-breaking reactions are prevented from occurring. The resulting graft copolymers were tested as compatiblizers/impact modifiers blended with Nylon-6, and one of them was preliminarily tested as a coupling agent in the preparation of nanocomposites of IIR and an organo-clay. Blends of PA-6/IIR-g-MA exhibited a significant increase in impact resistance at increasing loads of the modified IIR, as well as a good rubber particle dispersion in the polyamide matrix. On the other hand, the performance of IIR-g-SMA as an impact modifier of PA, or as a coupling agent in the preparation of rubber-organoclay nanocomposites, is marginal. View Full-Text
Keywords: polymer grafting; butyl rubber; nitroxide-mediated polymerization; polymer nanocomposite; polymer blend polymer grafting; butyl rubber; nitroxide-mediated polymerization; polymer nanocomposite; polymer blend
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MDPI and ACS Style

Bonilla-Cruz, J.; Hernández-Mireles, B.; Mendoza-Carrizales, R.; Ramírez-Leal, L.A.; Torres-Lubián, R.; RamosdeValle, L.F.; Paul, D.R.; Saldívar-Guerra, E. Chemical Modification of Butyl Rubber with Maleic Anhydride via Nitroxide Chemistry and Its Application in Polymer Blends. Polymers 2017, 9, 63.

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