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Journal of Nanomaterials
Volume 2012 (2012), Article ID 352937, 8 pages
http://dx.doi.org/10.1155/2012/352937
Research Article

Cast Nanostructured Films of Poly(methyl methacrylate-b-butyl acrylate)/Carbon Nanotubes: Influence of Poly(butyl acrylate) Content on Film Evaporation Rate, Morphology, and Electrical Resistance

Polymer Processing Department, Centro de Investigación en Química Aplicada (CIQA), Boulevard Enrique Reyna, No. 140, Colonia San José de los Cerritos, 25294 Saltillo, COAH, Mexico

Received 28 February 2012; Accepted 24 March 2012

Academic Editor: Sevan P. Davtyan

Copyright 漏 2012 F. Soriano-Corral et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Nanocomposites of poly(methyl methacrylate-b-butyl acrylate)/multiwalled carbon nanotubes were prepared from different copolymers synthesized by RITP technique using iodine functionalized poly(methyl methacrylate) as macrochain transfer agent to obtain block copolymers with butyl acrylate as comonomer in a sequential copolymerization. Poly(butyl acrylate) contents of 7, 20, and 30鈥墂t% were attained in each copolymer. These copolymers were used to prepare nanostructured films by casting process, using chloroform as solvent, and carboxyl functionalized MWCNT at 0.4, 0.6, 0.8, 1.0, and 1.2鈥墂t%. During the film preparation, the absolute drying rate (饾憗) was calculated with respect to the poly(butyl acrylate) and MWCNT composition. For copolymers containing 7 and 20鈥墂t% of poly(butyl acrylate) the 饾憗 values slightly decrease with the MWCNT concentration, while for the suspension prepared with the copolymer at 30鈥墂t% of poly(butyl acrylate) the 饾憗 values decrease drastically down to 50% approximately. The MWCNT content at the percolation threshold point was found to be 0.8鈥墂t%, for all nanostructured films. The dispersion of MWCNT within the polymer matrix decreased with increasing the poly(butyl acrylate) composition, but it did not affect the electrical properties, which is assumed to be due to induction of the bridging effect and the MWCNT preference to locate into the poly(methyl methacrylate) phase.