Evaluation of the Use of Plasticizer in the Development of a Post-Consumer Pet Adhesive by Thermomechanical Processing with Anticorrosive Properties

Previous results on the use of recycled polyethylene terephthalate (rPET) in the formation of corrosion-resistant films showed the possibility of providing a low-cost solution to some corrosion problems in the industry. However, to the best of our knowledge, no work has yet studied the thermomechanical incorporation of plasticizers on PET films for anticorrosion applications. Thus, in this work, a thermomechanical route was tested, for the first time, aiming at the production of anticorrosive PET-based adhesive films. A series of characterization methods were used to investigate the influence of the plasticizer addition to the thermal, mechanical, electrochemical and anticorrosive properties of the PET-based films produced. It was found that the 100% PET sample showed better mechanical and corrosion resistance performance compared to the plasticized ones, being comparable to or even better than benchmark tapes commercialized by 3M, maintaining impedance values consistently above 10 GΩ.cm2 for frequencies below 1 Hz and phase angle near 90º over a broad range of frequencies in the EIS tests.