The Effect Of The Binder Coverage On The Glass Fiber And Interface Of Its Composites

In this study, the effects of surface morphology, interphase and aging on glass fiber with different binder coverage reinforce composites have been researched. Interphase and the morphology are two important factors to glass fiber reinforced resin. The binder coverage is related to the properties of the interface of the composites. The proper binder coverage is important for the composites materials. This research plays an important role and has great significance for developing the surface performance.The comprehensive evaluation of surface morphology effect of glass fibers which epoxy, nylon and PP compatible have been done by scanning electron microscopy (SEM), atomic force microscopy (AFM), EDX and X– ray photoelectron spectroscopy (XPS), respectively. The result shows that smooth sizing with some tiny and uniform protuberances can enlarge the surface area of the glass fiber, and increase the wettability of resin to glass fiber, so as to increase the interface properties of the glass fiber/resin composites. But if the binder coverage is high, the surface of the glass fiber is patchy. There are some regions without sizing, and they are easy to form the disfigurements in the interface of the composites resulting in the stress concentration and the decline of the strength of the interface of the composites.Meaning while, with the XPS results, the carbon/silicon ratio, oxygen/silicon ratio and carbon/oxygen ratio of each sample are calculated, and then establish the relationship between these ratio values and the content of coverage and the relationship between the carbon/silicon ratio, carbon/oxygen ratio and oxygen/silicon. Develop a mathematical model to show how the relationship of these ratios can be used to estimate the surface coverage of the sizing on glass fiber and obtain information on the stoichiometry of sizing. For glass fiber compatible to epoxy, when the LOI of coating is 0.105%, the coverage is biggest with 97.8% when the LOI of coating is 0.64%, the coverage is smallest with 76.4%. For glass fiber compatible to Nylon, when the LOI of coating is0.131%, the coverage is biggest with 96.8% when the LOI of coating is 0.65%, the coverage is smallest with 71.3%.For glass fiber compatible to PP, when the...