Abstract
A glassy hyperbranched polymer (HBPG) was synthesized and dispersed within an aeronautical graded epoxy matrix as toughening agent. This filler is a polyester characterized by a Tg higher then room temperature (∼90 °C) and obtained by means of bulk poly-condensation reaction starting from a diphenolic acid as precursor.HBPG/epoxy systems were prepared considering two concentration levels (0.1 and 5 wt%) and the effects on mechanical properties and fracture toughness were investigated. HBPG induces a limited reduction of the Tg along with an improvement of the fracture toughness performances as indicated by the increase KIC and GIC values.
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