Surface modification and physical properties of various UHMWPE-fiber-reinforced modified epoxy composites

From a comparison of the composite systems formed from neat DGEBA and from the two modified DGEBA matrices, we found that the choice of resin matrix played an important role in determining the tensile strength

S. P. Lin; J. L. Han; J. T. Yeh; F. C. Chang; K. H. Hsieh

2007

Scholarcy highlights

  • Epoxy resins are vitally important constituents in many manufacturing composite materials
  • From a comparison of the composite systems formed from neat DGEBA and from the two modified DGEBA matrices, we found that the choice of resin matrix played an important role in determining the tensile strength
  • The BHHBPDGEBA matrix composites exhibited the same trend: the tensile strengths were $ 32% higher for the untreated ultrahigh-molecular-weight polyethylene fiber-reinforced system and 30% higher for the plasma-treated UHMWPE fiber-reinforces system than they were for the neat DGEBA matrix composites
  • Evidence obtained from electron spectroscopy for chemical analysis, changes in weight, and scanning electron microscope images suggest that plasma and chemical agent treatment improved the degree of interfacial adhesion between UHMWPE fibers and DGEBA matrices because of the introduction of micropits on the plasma-treated UHMWPE fiber surfaces and of rough, corrugated protuberances on the chemically treated UHMWPE fibers’ surfaces
  • The UHMWPE fiber-reinforced composites formed from both types of surface-modified UHMWPE exhibited slightly improved tensile strengths but notably decreased elongations relative to those of the untreated UHMWPE fiber-reinforced composite, as confirmed from SEM images of the fracture surfaces and from wet-out analyses
  • From studies of composite systems formed from neat DGEBA and from two modified DGEBA matrices, it was found that the choice of resin matrix was an important factor affecting the tensile strength, but not the elongation
  • The increased tensile strengths of composites prepared from PU-crosslinked DGEBA and BHHBP-DGEBA matrices can be explained as resulting from crosslinking between the soft PU prepolymer and the DGEBA matrix and grafting between the rigid-rod-like BHHBP and the DGEBA matrix

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