Thermosets are highly cross-linked polymers with a three-dimensional molecular structure. The network structure gives rise to mechanical properties, however, one major drawback of thermosets, which also results from their network structure, is their poor resistance to stress and to crack initiation....
Thermosets are highly cross-linked polymers with a three-dimensional molecular structure. The network structure gives rise to mechanical properties, however, one major drawback of thermosets, which also results from their network structure, is their poor resistance to stress and to crack initiation. In this study, to improve the fracture toughness and mechanical properties of epoxy resin, the modified thermoplastics have been introduced. The reactive thermoplastics such as amine terminated polyetherimide(ATPEI), ATPEI-CTBN-ATPEI(ABA) triblock copolymer, ATPEI-CTBN(AB) diblock copolymer, and carboxyl group functionalized ATPEI were synthesized, after that blended with epoxy resin. By using this epoxy resins, the carbon fiber reinforced composites(CFRCs) were fabricated. Then, impact absorption energy were investigated by using a drop weight impact test machine. Impact absorption energy of thermoplastics modified epoxy resins were higher than that of the neat epoxy resin. Particularly, the ATPEI-CTBN-ATPEI(ABA) triblock copolymer modified epoxy resin show much higher impact absorption energy, i. e., about 397% improvement compared to the case of neat epoxy resin. Impact absorption energy of thermoplastics modified epoxy CFRCs were higher than that of the neat epoxy CFRC. Particularly, the ATPEI-CTBN-ATPEI(ABA) triblock copolymer modified epoxy CFRC show much higher impact absorption energy, i. e., about 196% improvement compared to the neat epoxy CFRC. As a results, the epoxy/ABA blend system showed good toughness and improved mechanical properties.
Thermosets are highly cross-linked polymers with a three-dimensional molecular structure. The network structure gives rise to mechanical properties, however, one major drawback of thermosets, which also results from their network structure, is their poor resistance to stress and to crack initiation. In this study, to improve the fracture toughness and mechanical properties of epoxy resin, the modified thermoplastics have been introduced. The reactive thermoplastics such as amine terminated polyetherimide(ATPEI), ATPEI-CTBN-ATPEI(ABA) triblock copolymer, ATPEI-CTBN(AB) diblock copolymer, and carboxyl group functionalized ATPEI were synthesized, after that blended with epoxy resin. By using this epoxy resins, the carbon fiber reinforced composites(CFRCs) were fabricated. Then, impact absorption energy were investigated by using a drop weight impact test machine. Impact absorption energy of thermoplastics modified epoxy resins were higher than that of the neat epoxy resin. Particularly, the ATPEI-CTBN-ATPEI(ABA) triblock copolymer modified epoxy resin show much higher impact absorption energy, i. e., about 397% improvement compared to the case of neat epoxy resin. Impact absorption energy of thermoplastics modified epoxy CFRCs were higher than that of the neat epoxy CFRC. Particularly, the ATPEI-CTBN-ATPEI(ABA) triblock copolymer modified epoxy CFRC show much higher impact absorption energy, i. e., about 196% improvement compared to the neat epoxy CFRC. As a results, the epoxy/ABA blend system showed good toughness and improved mechanical properties.
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