Surface, thermal, and mechanical properties of composites and nanocomposites of polyurethane/PTFE nanoparticles

Journal of Nanoparticle Research, 2014, 16:2529.

P. S. Anbinder ⁽¹⁾ ,P. J. Peruzzo ⁽¹⁾ ,A. de Siervo ⁽²⁾ ,J. I. Amalvy ^{(1) (3)}

 

1. Grupo (Nano)Materiales Poliméricos, Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA), (CCT La Plata – CONICET- Universidad Nacional de La Plata), Diag. 113 y 64, La Plata, Argentina.
2. Departamento de Física Aplicada, Instituto de Física “Gleb Wataghin”, Universidade Estadual de Campinas, UNICAMP, Campinas, Brazil and
3. Centro de Investigación y Desarrollo en Tecnología de. Pinturas(CIDEPINT), Av. 52 entre 121 y 122; Centro de Investigación y Desarrollo en Ciencia y Tecnología de Materiales (CITEMA), Facultad Regional La Plata (Universidad Tecnológica Nacional), 60 y 124 y Cátedra Materiales Poliméricos, Facultad de Ingeniería, Universidad Nacional de La Plata, Calle 1 y 47, La Plata, Argentina.

 

Abstract

Films from blends of polyurethane and nano-polytetrafluoroethylene aqueous dispersions (PU/nanoPTFE) were prepared, and the effect of the addition of different amounts of PTFE nanoparticles (50 nm) was studied. The changes in the superficial properties of the films were studied by means of XPS, ATR/FTIR, and contact angle measurements. SEM and TEM results are also included. The contact angle values confirm the surface hydrophobicity of composite films. Even though nanoparticles are present in the bulk, higher concentrations of particles appear at the surface in samples with lower nanoPTFE content (up to 10 wt%), as revealed by XPS. Higher amounts of nanoPTFE particles cause aggregation. The mechanical and thermal properties of composites are also discussed.

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