ICF100500PR a) b) -5 0 5 10 15 20 25 30 35 19800 20000 20200 20400 20600 20800 21000 21200 21400 21600 Pixel µm Fig. 5 – Argon plasma treated PET fibre for 5s post heated at 100ºC. a) scanning electron microscopy of the fibre surface. b) roughness profile of the PET fibre. a) b) -5 0 5 10 15 20 25 30 35 40 15500 16000 16500 17000 17500 18000 18500 19000 Pixel µm Fig. 6 – Argon plasma treated PET fibre for 20s post heated at 100ºC. a) scanning electron microscopy of the fibre surface. b) roughness profile of the PET fibre. a) b) 0 5 10 15 20 25 30 35 2000 4000 6000 8000 10000 12000 14000 16000 Pixel µm Fig. 7 Argon plasma treated PET fibre for 100s post heated at 100ºC. a) scanning electron microscopy of the fibre surface. b) roughness profile of the PET fibre. 8 µm 8 µm 8 µm Figures 2a to 7a represent the fracture surface of oxygen and argon plasma treated from 5s to 100s and post exposed to the matrix cure temperature, 100ºC. Roughness profile obtained through the scanning line method are represented in figures 2b to 7b and average distances of the roughness interval, for each condition, were calculated. The distances of the roughness interval (Dri) for the oxygen plasma treated PET fibres from 5s to 100s post exposed at 100ºC were 0,44µm, 0,45µm and 0,57µm, respectively and for the argon plasma treated PET fibres from 5s to 100s post exposed at 100ºC were 0,59µm, 0,65µm and 0,99µm. As a comparison parameter, it is important to remember that Dri is equal to 0,55 µm for the untreated fibres. Higher Dri means less roughness peaks in the reference unit length; closely spaced surface defects are associated to low values of Dri. On the other hand, surface analysis from figure 2a to 7a shows an intense 5
RkJQdWJsaXNoZXIy MjM0NDE=