Toughening of aromatic epoxy via aliphatic epoxy copolymers |
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Affiliation: | 1. Division of Medical Engineering Research, National Health Research Institutes, Zhunan 35053, Taiwan, ROC;2. Department of Mechanical Engineering, Chung Hua University, Hsinchu 30012, Taiwan, ROC;1. Gyeonggi Regional Division, Korea Institute of Industrial Technology, Ansan 15588, South Korea;2. Department of Chemistry, Hanyang University, Seoul 04763, South Korea;1. Liaoning Key Laboratory of Advanced Polymer Matrix Composites, Faculty of Aerospace Engineering, Shenyang Aerospace University, Shenyang, 110136, China;2. State Key Laboratory of Fine Chemicals, School of Chemical Engineering, Dalian University of Technology, Dalian, 116012, China;1. Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan, 030001, China;2. University of Chinese Academy of Sciences, Beijing, 100049, China |
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Abstract: | While aromatic diglycidyl ether of bisphenol A (DGEBA) based epoxy polymer matrix systems are important for high-performance applications, their brittle nature is an issue that needs to be addressed. In this paper the authors show that small additions of a more flexible aliphatic epoxy copolymers, both di- and tri-functional, can significantly increase the notched Izod impact strength (56–77%) over the neat DGEBA, while not detrimentally affecting other mechanical properties such as glass transition temperature and flexural properties. In fact, at 1 wt% concentrations, the tri-functional epoxy shows a slight increase (∼2%) in the glass transition temperature compared to neat DGEBA. The improvement in impact toughness is attributed to the more flexible backbone of the aliphatic epoxy molecules. The total miscibility of the aromatic and aliphatic epoxies within the investigated concentration range (up to 20 wt%) allows for this toughening approach to be directly applied to current composite production methods, such as resin transfer molding (RTM). |
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Keywords: | Toughening Aliphatic epoxy Enhanced impact strength |
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