research on interface modification based on dopamine has been greatly developed
but the high price of dopamine limits its practical application. Cheap catechol-tetraethylenepentamine (Cat-TEPA)
similar to dopamine
can spontaneously polymerize and then deposit on the surface of various materials
exhibiting strong adhesion
reactivity
and no selectivity to the substrate. Surface modification based on Cat-TEPA has become a universal method suitable for practical applications. In this paper
ultra-high molecular weight polyethylene (UHMWPE) fiber was modified by Cat-TEPA. Transmission electron microscopy (TEM)
infrared spectroscopy (FTIR)
X-ray photoelectron spectroscopy (XPS)
X-ray diffraction (XRD)
differential scanning calorimetry (DSC)
thermogravimetric analysis (TGA)
and the static contact angle investigations were used to characterize the structure and performance of the modified fibers. The interfacial shear strength (IFSS) between the fiber and the epoxy resin before and after modification was measured by monofilament extraction experiment. The effects of reactant ratio and reaction time on interface properties were explored and the optimal modification conditions were determined. The results show that Cat-TEPA modification does not affect the crystallization and thermal stability of the fiber
and the surface wettability of the fiber is improved after modification. An optimal IFSS increase of about 44% has been obtained when the molar ratio of Cat-TEPA is 1:4 and reaction time is 24 h.
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