Surface Treatment of Phosphate Glass Fibers Using 2-Hydroxyethyl Methacrylate: Fabrication of Poly(caprolactone)-Based Composites

2-Hydroxyethyl methacrylate (HEMA) solution (1-10 wt %) was prepared in methanol and phosphate glass fibers were immersed in that solution for 5 min before being cured (irradiation time: 30 min) under UV radiation. Maximum polymer loading (HEMA content) was found for the 5 wt % HEMA solution. Degradation tests of the fibers in aqueous medium at 37 degrees C suggested that the degradation of the HEMA-treated fibers was lower than that of the untreated fibers. X-ray photoelectron spectroscopy revealed that HEMA was present on the surface of the fibers. Using 5 wt % HEMA-treated fibers, poly(caprolactone) matrix unidirectional composites were fabricated by in situ polymerization and compression molding. For in situ polymerization, it was found that 5 wt % HEMA-treated fiber-based composites had higher bending strength (13.8% greater) and modulus (14.0% greater) than those of the control composites. For compression molded composites, the bending strength and modulus values for the HEMA-treated samples were found to be 27.0 and 31.5% higher, respectively, than the control samples. The tensile strength, tensile modulus, and impact strength of the HEMA composites found significant improvement than that of the untreated composites. The composites were investigated by scanning electron microscopy after 6 weeks of degradation in water at 37 degrees C. It was found that HEMA-treated fibers inside the composite retained much of their original integrity while the control samples degraded significantly. (C) 2008 Wiley Periodicals, Inc. J Appl Polym Sci 111: 246-254, 2009