Effect of Gamma Ray Irradiation on the Mechanical and Thermal Properties of MWNTs Reinforced Epoxy Resins
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Epoxy resins are widely used as high performance thermosets in many industrial applications,such as coatings, adhesives and composites. Recently, a lot of research has been carriedout in order to improve their mechanical properties and thermal stability in various fields. Carbonnanotubes possess high physical and mechanical properties that are considered to be ideal reinforcingmaterials in composites. CNT-reinforced epoxy system hold the promise of deliveringsuperior composite materials with their high strength, light weight and multi functional features. Therefore, this study used multi-walled carbon nanotubes (MWNT) and gamma rays to improvethe mechanical and thermal properties of epoxy. The diglycidyl ether of bisphenol A (DGEBA) asepoxy resins were cured by gamma ray irradiation with well-dispersed MWNTs as a reinforcingagent and triarylsulfonium hexafluoroantimonate (TASHFA) as an initiator. The flexural moduluswas measured by UTM (universal testing machine). At this point, the flexural modulus factorexhibits an upper limit at 0.1 wt% MWNT. The thermal properties had improved by increasing thecontent of MWNT in the result of TGA (thermogravimetric analysis). However, they were decreasedwith increasing the radiation dose. The change of glass transition temperature by the radiation dosewas characterized by DMA (dynamic mechanical analysis).
Abstract
Epoxy resins are widely used as high performance thermosets in many industrial applications,such as coatings, adhesives and composites. Recently, a lot of research has been carriedout in order to improve their mechanical properties and thermal stability in various fields. Carbonnanotubes possess high physical and mechanical properties that are considered to be ideal reinforcingmaterials in composites. CNT-reinforced epoxy system hold the promise of deliveringsuperior composite materials with their high strength, light weight and multi functional features. Therefore, this study used multi-walled carbon nanotubes (MWNT) and gamma rays to improvethe mechanical and thermal properties of epoxy. The diglycidyl ether of bisphenol A (DGEBA) asepoxy resins were cured by gamma ray irradiation with well-dispersed MWNTs as a reinforcingagent and triarylsulfonium hexafluoroantimonate (TASHFA) as an initiator. The flexural moduluswas measured by UTM (universal testing machine). At this point, the flexural modulus factorexhibits an upper limit at 0.1 wt% MWNT. The thermal properties had improved by increasing thecontent of MWNT in the result of TGA (thermogravimetric analysis). However, they were decreasedwith increasing the radiation dose. The change of glass transition temperature by the radiation dosewas characterized by DMA (dynamic mechanical analysis).
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