ICF100500PR Improvement of the adhesion strength of PET/PMMA composite by radio frequency plasma treatment aCioffi, M. O. C., aVoorwald, H. J. C. and bMota, R. P a Department of Materials and Technology, b Department of Physics and chemistry State University of São Paulo “Júlio Mesquita Filho”, Av. Ariberto Pereira da Cunha, 333 Cep 12516-410 Guaratinguetá-SP, BRAZIL. ABSTRACT The adhesion between polyethylene terephthalate (PET) fibres and polymethyl methacrylate (PMMA) matrix was analysed. The overall goal was to establish mechanical and chemical links between PET and PMMA, in order to increase the adhesion in their composites using cold plasma treatments. PET filaments were treated in a radio frequency (RF) plasma reactor using argon and oxygen as gas fuel. The excitation frequency was 13,56 MHz; the power of the electrical field 50 W, the pressure was set to 0,4 mbar and the treatment times were 5s, 20s, and 100s. Oxygen and argon plasmas were found to promote both chemical and mechanical anchoring by etching and sputtering mechanisms on the surface increasing fibre roughness. The mechanical strength modification of PET fibres was evaluated by pull-out tests of the treated and untreated PET monofilaments. The fibres were subsequently examined by scanning electron microscopy (SEM) to monitor changes of surface roughness. Results obtained showed that the cold plasma causes an increase of the adhesion strength of PET fibre/PMMA matrix and strong modification in the structure of the fibre surface. Keywords: RF plasma; adhesion, PET/PMMA composite * Corresponding author. Tel: +55-12-5252800 (r. 306); e-mail: cioffi@feg.unesp.br. 1
RkJQdWJsaXNoZXIy MjM0NDE=