Crosslinking Reactions and Surface Properties of Interpenetrating Networked Epoxy Resins

• Main Authors: Wei-hsun Hsu, 徐偉勛
• Other Authors: None
• Format: Others
• Language: zh-TW
• Published: 2014
• Online Access: http://ndltd.ncl.edu.tw/handle/58392950191414226649

碩士 === 國立高雄大學 === 化學工程及材料工程學系碩士班 === 101 === In this study, two epoxy resins with different crosslinking reaction rates were chosen for the preparations of interpenetrating networked polymers (IPN) and were investigated on the dependence of their surface properties on compositions of epoxy resins using FTIR, DSC, and contact angle analyzer for chracterizations. The epoxy resins included diglycidyl ether of bisphenol A (DGEBA) and methyl-3,4-epoxycyclohexyl-carboxylate (MECC), both using methylhexahydrophthalic anhydride (MHHPA) as the curing agent. The compositions included DGEBA/MECC/MHHPA 100/0/100, 75/25/100, 50/50/100, 25/75/100, and 0/100/100, crosslinking at 110 ℃, 130 ℃, and 150 ℃ for 30 min. FTIR spectra confirmed the occurrence of crosslinking reactions and formation of IPN structures. DSC data found that the crosslinking reactions were exothermic and the exothermic peaks shifted to higher temperatures with higher DGEBA/MECC weight ratios, indicating that the reaction rate of MECC was higher than that of DGEBA. The measurements of water contact angles of the cured IPN found that the contact angles at top and bottom of the cured samples both decreased with decreasing DGEBA/MECC weight ratios, an indication that higher contents of MECC in composition would give more hydrophilic surface properties and might lead to higher adhesive strengths.