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Journal of Nanotechnology
Volume 2012 (2012), Article ID 875815, 10 pages
http://dx.doi.org/10.1155/2012/875815
Research Article

Preparation and Properties of PTFE-PMMA Core-Shell Nanoparticles and Nanocomposites

1Dipartimento di Scienze e Innovazione Tecnologica, Università del Piemonte Orientale “Amedeo Avogadro,” Interuniversity Consortium for Materials Science Technology (INSTM), UdR Alessandria, Viale T. Michel 11, 15100 Alessandria, Italy
2Dipartimento di Biochimica “G. Moruzzi,” Modena-S3, Istituto di Nanoscienze del Consiglio Nazionale delle Ricerche, Università di Bologna, Italian Interuniversity Consortium for Materials Science and Technology (INSTM), UdR Alessandria, Via Irnerio 48, 40126 Bologna, Italy
3Solvay Solexis SpA, Piazzale Donegani 5/6, Alessandria 15047 Spinetta Marengo, Italy
4Institute for the Chemical and Physical Processes, National Research Council, Via G. Moruzzi 1, 56124 Pisa, Italy
5NanoFacility Piemonte, Electromagnetism Division, Istituto Nazionale di Ricerca Metrologica, Strada delle Cacce 91, 10135 Torino, Italy

Received 4 April 2012; Accepted 16 July 2012

Academic Editor: Baoquan Sun

Copyright © 2012 Diego Antonioli 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

The preparation of polytetrafluoroethylene-poly(methyl methacrylate) (PTFE-PMMA) core-shell particles was described, featuring controlled size and narrow size distribution over a wide compositional range, through a seeded emulsion polymerization starting from a PTFE seed of 26 nanometers. Over the entire MMA/PTFE range, the particle size increases as the MMA/PTFE ratio increases. A very precise control over the particle size can be exerted by properly adjusting the ratio between the monomer and the PTFE seed. Particles in the 80–240 nm range can be prepared with uniformity indexes suited to build 2D and 3D colloidal crystals. These core-shell particles were employed to prepare nanocomposites with different compositions, through an annealing procedure at a temperature higher than the glass transition temperature of the shell forming polymer. A perfect dispersion of the PTFE particles within the PMMA matrix was obtained and optically transparent nanocomposites were prepared containing a very high PTFE amount.