Abstract
Abstract To evaluate the hydrophilic capacity, polypropylene and surfactant (polyether siloxane) samples were extruded in the proportions of 0.0, 0.5, 1.0 and 3.0 (wt%) and films were obtained in a heated press. The samples were submitted to measurements of contact angle, surface tension, melt flow index and surface roughness. The results indicated that increasing surfactant content promoted better wettability and consequently higher hydrophilicity. Using water, the increase in the surfactant content reduced the contact angle (92.58° to 68.10°) and increased the surface tension (26.7 to 56.9 mN.m-1). However, with ethylene glycol, increasing the surfactant content promoted a small variation on the contact angle (59.14° to 65.10°) and on the surface tension (5.5 to 5.0 mN.m-1). The surfactant promoted a slight change in the melt flow index but not affected the roughness of the samples.
Highlights
Polypropylene (PP) is currently one of the most studied the liquid)
The most common process is melt blown, which is an extrusion process in which the molten polymer passes through air jets after exiting the extrusion die, causing the diameter of the fiber to decrease when in considering the applications for automotive components, such as: benches, internal part of doors, for the protection of the instruments of dashboards, aiming the replacement of the natural fibers, which degrade in a short period of time[8]
In this study an average contact angle of 92.58° was obtained for the unmodified PP in water
Summary
When the angle is between 90° and 180°, it polymers, mainly because of its interesting properties as can be said that the surface is hydrophobic, being called moderate rigidity above glass transition temperature, relatively predominantly non-wetting[6]. The manufacture of non-woven products usually occurs through melt-blown or spunbond processes. The most common process is melt blown, which is an extrusion process in which the molten polymer passes through air jets after exiting the extrusion die, causing the diameter of the fiber to decrease when in considering the applications for automotive components, such as: benches, internal part of doors, for the protection of the instruments of dashboards, aiming the replacement of the natural fibers, which degrade in a short period of time[8]. For the utilization of non-woven PP in substitution of natural fibers, the PP needs an industrially and economically viable modification
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