كيميا كربلايي محمد

Carbon fibers are meterials with high strength and modulus and low density ( compared to other common reinforcements) that have the ability to create suitable composites to create strong and light structures. One of the disadvantages of these composites is the lack of a suitable common boundary with the polymer background and as a result, poor adhesion between carbon and polymer fibers, which can lead to the failure of the composite through this weak is usually used on the fibers. In this study, common surface. To solve this problem, slate (such as epoxy coating) thw surface of carbon fiber was modified using silane coupling agents to change the type of interaction between polymer fibers from polar physics to chemistry. For this purpose, the surface of the fibers was first functionalized by acid oxidation (OH) method. The functionalized fiber were surface modified with two coupling agents of aminoprpyl triethoxy silane (APTES) and ethoxycyl probyl amine (TESPA) at stochiometric concentrations (X), 5, 10, 20X. Tensile strength and moduls properties of carbon fibers were eva‎luated after functionalization and silane. Also, the morphology and thermal behavior of the fibers were studied before and after surface modification. The result of TGA analysis showed that the bonding density with both types of silane at the concentration of 1X is the highest. Also, surface modification with both streams increased the modulus and tensile strength of carbon fibers by more than 40% and 20%, respectively. Next, monofilament failure tests with epoxy resin and carbon fiber. The result showed that both silane had an effect on reducing crack density, but silane APTES caused a greater decrease in crack density.

اصلاح سطح , الياف كربن , كامپوزيت , سيلان

surface modification , carbon fiber , composite

kimia karbalei mohammad

dr masoud jamshidi