Browsing by Author "Seki, Yoldas"

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Effect of the Low and Radio Frequency Oxygen Plasma Treatment of Jute Fiber on Mechanical Properties of Jute Fiber/Polyester Composite
(Korean Fiber Soc, 2010) Seki, Yoldas; Sarikanat, Mehmet; Sever, Kutlay; Erden, Seckin; Gulec, H. Ali
We investigated the surface modification of jute fiber by oxygen plasma treatments. Jute fibers were treated in different plasma reactors (radio frequency "RF" and low frequency "LF" plasma reactors) using O-2 for different plasma powers to increase the interface adhesion between jute fiber and polyester matrix. The influence of various plasma reactors on mechanical properties of jute fiber-reinforced polyester composites was reported. Tensile, flexure, short beam shear tests were used to determine the mechanical properties of the composites. The interlaminar shear strength increased from 11.5 MPa for the untreated jute fiber/polyester composite to 19.8 and 26.3 MPa for LF and RF oxygen plasma treated jute fiber/polyester composites, respectively. O-2 plasma treatment also improved the tensile and flexural strengths of jute fiber/polyester composites for both plasma systems. It is clear that O-2 plasma treatment of jute fibers by using RF plasma system instead of using LF plasma system brings about greater improvement on the mechanical properties of jute/polyester composites.
Improvement of Interfacial Adhesion of Glass Fiber/Epoxy Composite by Using Plasma Polymerized Glass Fibers
(Taylor & Francis Ltd, 2010) Sever, Kutlay; Sarikanat, Mehmet; Seki, Yoldas; Gulec, Haci Ali; Mutlu, Mehmet; Tavman, Ismail Hakki
This study intends to produce plasma polymer thin films of -glycidoxypropyltrimethoxysilane (-GPS) on glass fibers in order to improve interfacial adhesion of glass fiber-reinforced epoxy composites. A low frequency (LF) plasma generator was used for the plasma polymerization of -GPS on the surface of glass fibers at different plasma powers and exposure times. X-ray photoelectron spectroscopy (XPS) and SEM analyses of plasma polymerized glass fibers were conducted to obtain some information about surface properties of glass fibers. Interlaminar shear strength (ILSS) values and interfacial shear strength (IFSS) of composites reinforced with plasma polymerized glass fiber were evaluated. The ILSS and IFSS values of non-plasma polymerized glass fiber-reinforced epoxy composite were increased 110 and 53%, respectively, after plasma polymerization of -GPS at a plasma power of 60W for 30min. The improvement of interfacial adhesion was also confirmed by SEM observations of fractured surface of the composites.