Efecto de un plasma pulsado de aire en las propiedades superficiales de caucho butílico
DOI:
https://doi.org/10.19136/jeeos.a10n3.6686Keywords:
Degradation, elasticity, hardness, hydrophobicity, polymerAbstract
The use of pulsed air plasma was evaluated as an option for modifying the physical properties of butyl rubber, with an emphasis on controlled surface wear. Commercial rubber samples (1.0 cm × 5.0 cm) obtained from bicycle inner tubes were used. All samples exposed to plasma were previously subjected to a 44 day acetone pretreatment to analyse the effects of the solvent before plasma treatment. The experimental design included 21 samples (three controls, three samples subjected to acetone bath pretreatment, and 15 samples subjected to acetone bath pretreatment plus air plasma exposure). Measurements of mass, contact angle, hardness, and elasticity were performed before and after treatment. Plasma was applied in a vacuum chamber using a radiofrequency generator (Cesar 136 RF, 600 W output), an impedance matching network (Navío), and a vacuum pump (Labconco model 117LA65312906). The conditions were: 250 W power, 3 cm electrode spacing, 10 minutes exposure time, and pulse frequencies between 10 000 and 30 000 Hz. The results show mass loss and a decrease in hydrophobicity. Mechanically, an increase in hardness and a decrease in elasticity were observed. It is concluded that pulsed air plasma is an effective alternative for the frequency-dependent surface modification of butyl rubber. Such changes may have potential applications in recycling and materials bonding.
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