Improvement of mechanical performances by plasma polymerisation technique for composite biomaterials

Abstract

In recent years, fibers are used for improving mechanical strength of acrylic-based resin which used for construction of protheses frequently. Improvement of the fiber- matrix interfase is a very important approach at redevelopment of mechanical properties. In this study, glass fibers are modified by radiofrequency (RF) plasma technique with using different monomers. Silane based monomer glisitoxypropyltrimethiloxysilane and amine based ethylenediamine (EDA)are polimerized on the glass fibers in plasma environment for application of two different approaches (hydrophobic/hydrophobic). Surface modification application is optimized with increasing power and exposure time parameters, which are used for low vacuum RF glow discharge. The change of surface properties for glass fibers are characterized by measurement of static contact angle and bending strain of fiber-acrylic composites are measured with 3 point bending device. While the cost of bending strain of the composites, which is prepared by virgin glass fibers, is 127.9±9 MPa, the maximum mechanical strength has been obtained at amine based plasma polymerization technique (150.2±4 MPa). The mechanical strenght is improved according to the working parameters that are used in silane based plasma polymerisation technique (141.2±7 MPa, power: 40W, Exposure Time: 30 min) It's proved with contact angle measurement that gaining less hydrofobic property to the surface is an appropriate approach.