Effects of Dry Etching Plasma Treatments on Natural and Synthetics Fibers: a Comparative Study
Tóm tắt
Nowadays, natural and synthetic fibers are becoming a valuable resource for composite industry. The use of natural and synthetic fibers as reinforcement of polymeric matrices has many advantages: it betters mechanical properties per unit of weight, decreases the cost of manufacturing per unit of volume and, among other things, it is environmentally friendly. Despite all of this, the low compatibility between the constituents can result in a poor mechanical behavior. However, plasma treatments can modify the surface of the fibers used as reinforcement, so the bond between the phases of the composite can be improved by its use. In this work, we present the results of a comparative study of the effects produced by dry etching plasma treatments on Young’s modulus and surface morphology of Guadua angustifolia, Fique, and Nylon fibers. Natural and synthetic fibers were exposed to physical bombardment with argon ions during different time intervals. Scanning electron microscopy (SEM) analysis showed that all treated fibers exhibited rough surfaces and that the surface roughness augmented by increasing the bombardment time. The results of Young’s modulus as a function of bombardment time displayed a significant increment in Guadua and Fique fibers but did not change significantly in Nylon fibers. The serious damages produced in the natural fibers by ion bombardment as determined by SEM analysis could be considered as the main cause of the observed increase in Young’s modulus. Other causes, however, can not be ruled out as responsible for the increment in Young’s modulus in natural fibers and the almost null effect in synthetic fibers.
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