Bismaleimide (BMI) Resin Modified by PEEK Bearing Pendant Reactive Propenyl Groups

Abstract

A reactive poly (ether ether ketone) PEEK with pendant propenyl groups was prepared by nucleophilic aromatic substitution of 4, 4’-Difluorobenzophenone (DFBP), diallylbisphenol A (DABPA) and bisphenyl A (BPA) as monomer. The prepared reactive PEEK with varying proportion was introduced to toughen bismaleimide (BMI) resin composing of 4,4'-bismaleimidodiphenyl methane (BMDM) and DABPA by melt technique without any solvent. The properties of the BMI resin as a function of the reactive PEEK concentration were evaluated. The presence of PEEK heightened the temperature of “ene” reaction for BMI and DABPA and slightly lowered the glass transition temperature (Tg) of the blends. The impact strength and fracture toughness were highest elevated from 9.0 KJ/m2and 186 J/m2to 15.2 KJ/m2and 239 J/m2 by 10 phr PEEK, respectively. At the same time, the thermal stability was improved by increasing the proportion of the PEEK. Scanning electron microscopy (SEM) of fracture surface revealed that the blends have good interfacial adhesion.

Characterization and properties of high-temperature resistant structure adhesive based on novel toughened bismaleimide resins

“…Many efforts have been devoted to the toughening modification of BMI resins by reducing their crosslinking density, incorporating the micro-phase separation structure or forming the interpenetrating polymer network. The main modification methods contain the design and synthesis of novel chain-extended BMI monomers, 6,7 copolymerization with allyl compounds, 8,9 Michael addition with aromatic diamines, [10][11][12] co-curing with other thermosetting resins and physical blends with thermoplastic resins, [13][14][15] rubber elastomers [16][17][18] and so on. Allyl compounds are often liquid, their usage as a building block can prepare modified BMI resins with good processability, and the resultant BMI cured products have outstandingly improved toughness.…”