HYDROPHILIZATION OF VIBRATION-DAMPING THERMOPLASTIC ELASTOMER BY ION-TREATMENT AT REDUCED PRESSURE
Abstract
For the study, sheets of polymeric vibration-absorbing thermoplastic elastomer (TPE) based on polyurethane with a thickness of 0.5 mm were used. They were made by melt extrusion of the composition on a twin-screw extruder in accordance with the developed technological documentation at FSUE "VIAM". The paper investigated the effect of ion-plasma treatment at reduced pressure on the contact angle and bond strength during peeling of a vibration-absorbing material (VPM) based on a thermoplastic elastomer with an adhesive. To compare the effect of surface degreasing and ionic treatment, thermoplastic elastomer samples were treated in ethyl alcohol and acetone in various combinations before and / or after ionic treatment. The possibility of decreasing the contact angle of thermoplastic elastomer due to the use of ion treatment at reduced pressure was demonstrated, while the value of the contact angle was determined by the discharge power of the ion source and the duration of treatment. For the treated samples, the minimum values of the contact angle were ~ 44° with the initial values of ~ 94°. It has been shown that the contact angle reduced during ion treatment returns to its initial values immediately after exposure to the treated surface with alcohol and acetone and over time during storage in air. It is shown that ionic treatment has a positive effect on the bond strength during peeling of the thermoplastic elastomer with the adhesive from the substrate, demonstrating the values of bond strength at the level of degreasing before gluing. At the same time, with a combination of ionic treatment and degreasing with acetone before gluing, it was possible to achieve the maximum value of the bond strength, which was 1.54 N/mm, which is 35% more than with degreasing with acetone and 3.7 times more than the values for the original untreated samples.
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