The toughening effects of chromium and cobalt acetylacetonate (Cr (acac)3 and Co (acac)3 ) additives on diglycidyl ether of bisphenol A/diethylenetriamine (DGEBA/DETA) and tetraglycidyldiaminodiphenylmethane/ diaminodiphenylsulphone (TGDDM/DDS) epoxy resins were investigated and correlated with the changes of their fracture surface morphology. According to fracture tests of their compact tension specimens (CTS), Cr(acac)3 had much higher toughening effects than Co(acac)3. Scanning and transmission electron microscope investigation of their fracture surfaces implied that the epoxy resins incorporated with Cr (acac)3 had more cohesive structure than those incorporated with Co (acac)3 or neat resins. The results have been further supported by gel permeation chromatography and wide-angle X-ray scattering analyses, which revealed that Cr (acac) 3 could interact with hydroxy groups in the epoxy networks and reinforced the structure
Посилання на статтю:
Organotransition-metal complexes as additives for epoxy resins: 1. Their effects on toughness and morphology of epoxy resins / King-Fu Lin*, Wen-Yung Shu and Tain-Luen Wey // Polymer. – 1993. – Vol 34. – P. 277-288.