Hydroxyl terminated PEEK-toughened epoxy–amino novolac phthalonitrile blends – Synthesis, cure studies and adhesive properties

摘要: Abstract Self cure promoting, amine-containing novolac–phthalonitrile (APN) resins of varying compositions were synthesized and characterized. APN possessing amine functionalities reduced the initiation temperature from 310 °C (typical pure phthalonitrile systems) to 180 °C. It showed excellent thermal stability up 420 °C high char residue 77–79 %. Co-reaction with diglicydyl ether bisphenol A (DGEBA) led a decrement in their though improved adhesive properties. Evidences obtained for epoxy–amine, epoxy–phthalonitrile amine–phthalonitrile reactions. The latter reactions formation oxazoline, triazine phthalocyanine groups network. These rationalized by density functional theory studies on model compounds. extents epoxy–amine epoxy–phthaonitrile quantified. Introduction hydroxyl terminated poly ketone (PEEK) brittleness blends lap shear strength. Toughening epoxy–amino novolac networks occurred through phase separation PEEK segments cured matrix.