Biopolymers Summit 2018 Plasma Surface Treatment of recycled polymers for Food Packaging - P????ricles Lopes Sant?￠?€??Ana- State University of Sao Paulo

摘要

In this work, it was used a vacuum system on a set upwell exploited, in order to use Plasma Immersion IonImplantation (PIII) and Plasma Immersion (PI cathode or PIanode), which were suitable techniques for the surfacetreatment over the Polyethylene Terephthalate (PET) substrates,from Coke bottles of 2 LTM. The purpose was: to change theirwettability, surface morphology and optical transmittance atvisible light. Some papers regard the physic-chemicalalterations on the surface of PET samples. However, theselectivity of those plasma treatments, results in a notable andpartial combination of surface properties, even with seriousrestrictions. It’s reasonable to reveal the results founded holderat the room temperature during the treatment time of 900 s. Thewettability behavior depends on the plasma technique appliedand the gas employed to them. In some cases, the surfacehydrophilization was not stable as seen by the temporalevolution of the contact angles roughness Rz, increased only afew tens of nanometers, in relation to the virgin PET (1.8 nm),even in a strong ion bombardment during the treatment. As ageneral trend, the roughness increases slightly for all radiation,depends on the parameters of the plasma treatment. PIIItechnique and N2 bombardment are more indicated than theplasma immersion and SF6 bombardment to increase thetransmittance of PET at visible region. In general, thoseparameters selected imply in a positive plasma conditions,considering the overview to try out a technological destinationfor recycled commercial polymers.