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Phase-Separated Structures and Fracture Toughness of Epoxy/Imide-Terminated Reactive Oligomer With Flexible Chain
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DOI：10.1002/pen.70672.png)
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Abstract
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The phase-separated structures and fracture toughness of epoxy/reactive oligomer blends were investigated. Imide groups were introduced into nonpolar reactive oligomers, enabling the design of an imide-terminated reactive oligomer (AO3636DIDA) that exhibited good compatibility with biphenyl-type epoxy resins. The epoxy blends cured with a phenol novolac curing agent formed phase-separated structures during the curing process. Compared with the cured epoxy blends containing reactive oligomers without imide groups, the cured epoxy/imide-containing reactive oligomer blends exhibited fine phase-separated structures that were independent of both the pre-curing temperature and the oligomer content (up to 15 wt%). In addition, the cured epoxy/imide-containing reactive oligomer blends exhibited a maximum 110% increase in fracture toughness compared with the unmodified cured epoxy resin.
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