Surface Treatment of Composites with Bismaleimide Resin-Based Wet Peel Ply for Enhanced Adhesive Bonding Performance

Abstract

Surface treatment is typically required to improve the bonding performance of carbon-fiber-reinforced composites. Herein, a wet peel ply was prepared using bismaleimide (BMI) resins as a matrix resin. The temperature–heating rate extrapolation method and rheological method were employed to study the reaction characteristics and viscosity-temperature characteristics of the matrix in the BMI wet peel ply. The curing temperatures of the BMI wet peel ply and the BMI prepreg were the same (200 °C), making this wet peel ply suitable for co-curing with the BMI prepreg. After treatment with the wet peel ply, the bonding strength of the BMI composite joint showed a mean shear strength of 35.5 MPa, which was 1.72% higher than that of the sanded composite and 17.5% higher than that of the composite treated with the dry peel ply. In addition, the BMI composite treated with the BMI wet peel ply exhibited good bonding stability with a coefficient of variation of 3.9. After damp-heat aging for 1440 h, the retention rate of shear strength at room-temperature was 82.3%. The relatively loosely woven carrier in the BMI wet peel ply increased the surface roughness of the composite, thus improving the bonding strength.

Branched Fluorine/Adamantane Interfacial Compatibilizer for PBO Fibers/Cyanate Ester Wave‐Transparent Laminated Composites

“…This is because the defects and pores at the interface of PBO fibers/BADCy composites are susceptible to the entry of water molecules. [ 64‐65 ] Due to the swelling and plasticizing effect of moisture absorption of BADCy matrix and interfacial debonding with PBO fibers, the interface cannot effectively transfer stress and will generate charge accumulation, [ 66 ] so that the corresponding mechanical properties and wave‐transparent performances are greatly reduced. The interfacial bonding of PBO fibers/FABPBO‐BADCy composites is better than that of PBO fibers/BADCy composites, which decreases the water absorption of PBO fibers/FABPBO‐BADCy (Figure S11), resulting in reduced damage of water molecules on the composites interface, thus showing relatively higher performance retention under the hygrothermal condition.…”

Epoxy-Modified Bismaleimide Structural Adhesive Film Toughened Synergistically with PEK-C and Core–Shell Polymers for Bonding CFRP

“…Peiris et al [ 26 ] studied the mechanical behavior of double-lap tensile shear joints of CFRP strips with different moduli and found that CFRP strips with high modulus exhibited higher bonding strength. In addition, the influence of the composite material surface treatment on bonded joint performance is also important [ 27 , 28 , 29 ]. Surface treatment of the composite material was implemented by Bora [ 30 ] using a CO 2 laser, which created micro-holes on the surface of the CFRP, thereby improving the mechanical interlocking effect on adhesive bonding and the bonding strength of the CFRP joints.…”

Accelerated‐curing epoxy structural film adhesive for bonding lightweight honeycomb sandwich structures

“…8,9 As a replacement to riveting and screwing, 10 adhesive bonding technology exhibits the advantages of light weight, saving time, corrosion resistance, and no drilling, which is especially important for joining composite parts, 6,11 thereby reducing the resulting stress concentration and damage to the parent material. 12,13 To satisfy the requirements of weight reduction and lower energy consumption, an increasing number of lightweight sandwich structures have been designed and used. 14 Generally, a lightweight sandwich structure consists of three parts: panels (metals or composites), structural adhesives, and cores (foam, honeycomb, etc.).…”

“…Among the various structural adhesives, epoxy structural adhesives are the most commonly and widely used and are particularly important because of their strong bonding and excellent processing properties 8,9 . As a replacement to riveting and screwing, 10 adhesive bonding technology exhibits the advantages of light weight, saving time, corrosion resistance, and no drilling, which is especially important for joining composite parts, 6,11 thereby reducing the resulting stress concentration and damage to the parent material 12,13 . To satisfy the requirements of weight reduction and lower energy consumption, an increasing number of lightweight sandwich structures have been designed and used 14 .…”