Toughening of Epoxy Systems with Interpenetrating Polymer Network (IPN): A Review.

In the case of impact and tensile strength, after certain concentration of toughener, a decreasing trend is usually observed which is linked with the formation of toughener rich domains, which eventually inhibits the development of IPN structure.

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The incorporation of thermosetting toughener usually results in enhanced fracture toughness and impact strength of epoxy system [ 66 , 68 ], which further shows an increasing trend as a function of increasing toughener content [ 64 , 69 , 70 ].

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