caa a22 4500 463231821 CHVBK 20180405153244.0 cr unu---uuuuu 170326e20071201xx s 000 0 eng 10.1007/s10853-007-1780-x doi (NATIONALLICENCE)springer-10.1007/s10853-007-1780-x Material characterization of blended epoxy resins related to fracture toughness [Elektronische Daten] [Andi Haris, Tadaharu Adachi, Yu Hayashi, Wakako Araki] The present study describes the effect of the macromolecular modifications on the fracture toughness of an epoxy system. We synthesized epoxy networks by the reaction of diglycidyl ether of bisphenol A (DGEBA) with methyl-tetrahydro-phthalic anhydride (MTHPA), initiated by a tertiary amine. Several materials were obtained by adding a high molecular weight monomer to one with low molecular weight (both based on DGEBA) at different concentrations. In every case, a stoichiometric amount of MTHPA was employed. The glass transition temperature and the Angell's fragility index, derived from thermo-viscoelastic properties, were used to characterize the materials. Relationship between these two parameters and the fracture properties, including the fracture toughness and the microscopic roughness of the fracture surfaces observed by atomic force microscope (AFM), was then investigated. We found that there were direct correlations among the glass transition temperature, the fragility, the fracture toughness, and the roughness. This study revealed that both the glass transition temperature and the fragility are effective for characterizing material in relation to the fracture toughness of the blended epoxy resins. Springer Science+Business Media, LLC, 2007 Haris Andi Department of Mechanical Sciences and Engineering, Tokyo Institute of Technology, 2-12-1-I6-1 Ookayama, Meguro-ku, 152-8552, Tokyo, Japan aut Adachi Tadaharu Department of Mechanical Sciences and Engineering, Tokyo Institute of Technology, 2-12-1-I6-1 Ookayama, Meguro-ku, 152-8552, Tokyo, Japan aut Hayashi Yu Department of Mechanical Sciences and Engineering, Tokyo Institute of Technology, 2-12-1-I6-1 Ookayama, Meguro-ku, 152-8552, Tokyo, Japan aut Araki Wakako Department of Mechanical Sciences and Engineering, Tokyo Institute of Technology, 2-12-1-I6-1 Ookayama, Meguro-ku, 152-8552, Tokyo, Japan aut Journal of Materials Science Springer US; http://www.springer-ny.com 42/23(2007-12-01), 9859-9866 0022-2461 42:23<9859 2007 42 10853 https://doi.org/10.1007/s10853-007-1780-x text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10853-007-1780-x text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Haris Andi Department of Mechanical Sciences and Engineering, Tokyo Institute of Technology, 2-12-1-I6-1 Ookayama, Meguro-ku, 152-8552, Tokyo, Japan aut NATIONALLICENCE 700 1- Adachi Tadaharu Department of Mechanical Sciences and Engineering, Tokyo Institute of Technology, 2-12-1-I6-1 Ookayama, Meguro-ku, 152-8552, Tokyo, Japan aut NATIONALLICENCE 700 1- Hayashi Yu Department of Mechanical Sciences and Engineering, Tokyo Institute of Technology, 2-12-1-I6-1 Ookayama, Meguro-ku, 152-8552, Tokyo, Japan aut NATIONALLICENCE 700 1- Araki Wakako Department of Mechanical Sciences and Engineering, Tokyo Institute of Technology, 2-12-1-I6-1 Ookayama, Meguro-ku, 152-8552, Tokyo, Japan aut NATIONALLICENCE 773 0- Journal of Materials Science Springer US; http://www.springer-ny.com 42/23(2007-12-01), 9859-9866 0022-2461 42:23<9859 2007 42 10853 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer