The Raman spectra of silicon carbide (SiC) monofilaments prepared by the chemical vapor deposition method have been investigated as a function of the excitation wavelength. As the excitation wavelength increases from 442 to 785 nm, significant changes in the Raman spectra from the SiC optical phonons are observed. It was found that Raman spectra excited with a shorter wavelength, are similar to those of bulk crystalline 3C-SiC whereas Raman spectra excited with a longer wavelength show a very broad feature between 600 and 1000 cm−1, similar to that of amorphous SiC. Possible reasons have been discussed to explain the effect of changing excitation wavelength on the line shape of Raman spectra from the SiC monofilaments.
Experimental studies were made on the surface characteristics of glass fibers with two different finishes. The effects of the chemical composition and thermal stability of the finishes on the compatibility between glass fibers and high melting temperature thermoplastics were investigated. Thermogravimetric Analysis (TGA) was used to characterize the composition of surface finishes and their thermal stability. The chemical composition of surface finishes was investigated using a combination of X-ray photoelectron spectroscopy [XPS) and Time-of-Flight secondary ion mass spectrometry (ToF SIMS). Static contact angle measurements were performed at room temperature to characterize the interfacial tension between the glass fibers and thermoplastics. The study provides a fundamental understanding on some important compatibility issues between thermoplastic resins and glass fiber related to composite fabrication and applications.
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