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.  2019 Elsevier Ltd. All rights reserved. Selection and peer-review under responsibility of the scientific committee of the 12th International Conference on Composite Science and Technology.
The effect of an aromatic hyperbranched polyester in aeronautical epoxy composites
Zuppolini SimonaCo-primo
;Zotti AldobenedettoCo-primo
;Borriello Anna
;Zarrelli MauroUltimo
2021
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. 2019 Elsevier Ltd. All rights reserved. Selection and peer-review under responsibility of the scientific committee of the 12th International Conference on Composite Science and Technology.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
