Abstract
Epoxy resin networks have been modified with block copolymer of polybutadiene and bisphenol A diglycidyl ether (DGEBA)-based on epoxy resin. The epoxy resin modified with carboxyl-terminated polybutadiene presented improved impact resistance and outstanding mechanical performance in terms of flexural and tensile properties because of the presence of rubber particles homogeneously dispersed inside the epoxy matrix. This modified system also resulted in an improvement of mechanical properties of the corresponding carbon fiber based composites. The outstanding properties were attributed to a better interaction fiber-matrix, as indicated by SEM micrographs.
Highlights
Composite materials derived from epoxy resin and carbon fiber are being extensively employed in aircraft industries because of their strength, high modulus and light weight
The use of low molecular weight rubber material is recommended to avoid an excessive increase of viscosity so that the processability of the system is not impaired.[4]
The amount of COOH group in the carboxylmodified HTPB (CTPB) sample was determined by titration and corresponded to 0.5 mmol g-1
Summary
Composite materials derived from epoxy resin and carbon fiber are being extensively employed in aircraft industries because of their strength, high modulus and light weight. The use of epoxy resins (ER) as a matrix is very popular because of their good engineering properties which include high stiffness and strength, creep resistance, chemical resistance and good adhesion to many substrates.[1] the major drawback of these resins is their brittleness in the cured state. It is well known that a small amount of reactive liquid rubber can greatly improve the fracture toughness of ERs by forming discrete rubbery particles chemically bonded to the matrix.[2,3] The use of low molecular weight rubber material is recommended to avoid an excessive increase of viscosity so that the processability of the system is not impaired.[4] The most popular rubbery modifying agent
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