Kim, S Kim, J Lim, SH Jo, WH Choe, CR 2024-01-21T15:33:21Z 2024-01-21T15:33:21Z 2021-09-05 1999-05-23 0021-8995 https://pubs.kist.re.kr/handle/201004/142184 A new mixing process was explored to increase further the fracture toughness and to investigate the toughening mechanisms of epoxy/nylon blend. In this process, without mechanical mixing, the mixtures of epoxy and premade nylon 6 powder were heated without the curing agent to specific temperatures, referred to as the "mixing temperature." For epoxy/nylon blends, at sufficiently high temperatures, a semi-interpenetrating network-like structure can be developed at the interphase via the reaction between the amine end group and the epoxide group. The depth of interphase and the extent of reaction depends on the mixing temperature. The strong dependency of the fracture energy on mixing temperature reveals the positive effect of the newly developed structure at the interphase. The increase of fracture toughness is possibly due to the enhanced crack fingering bifurcation/deflection mechanism resulting from the lamellae developed in the interphase and the enhanced plastic deformation of epoxy as a result of preyielding of the interphase. (C) 1999 John Wiley & Sons, Inc. English JOHN WILEY & SONS INC TOUGHENING MECHANISMS THERMOSET POLYMERS MODIFIED EPOXIES RESINS PHASE TEREPHTHALATE) CAVITATION COPOLYMERS PARTICLES FRACTURE Effects of mixing temperatures on the morphology and toughness of epoxy/polyamide blends Article 10.1002/(SICI)1097-4628(19990523)72:8<1055::AID-APP10>3.0.CO;2-8 1 JOURNAL OF APPLIED POLYMER SCIENCE, v.72, no.8, pp.1055 - 1063 JOURNAL OF APPLIED POLYMER SCIENCE 72 8 1055 1063 scie scopus 000079317300010 2-s2.0-0032674917 Polymer Science Polymer Science Article TOUGHENING MECHANISMS THERMOSET POLYMERS MODIFIED EPOXIES RESINS PHASE TEREPHTHALATE) CAVITATION COPOLYMERS PARTICLES FRACTURE epoxy/nylon blend mixing temperature fracture toughness morphology semi-IPN-like structure