Effects Of Surface Properties Of Glass And Film, And The Interface Properties On The Adhesion Of Laminated Glass

With the development of transparent materials and the occurrence of novel interlayer, serials of new laminated glass products continually come along with some new questions in practice. Therefore, it is urgent to systematically study the adhesion mechanism, material properties and the reason on adhesion quality for laminated glass, which will help practice effectively.In this paper, the influence of temperature, the most sensitive factor on bonding strength, was investigated. The results show that adhesion strength is a function of temperature, and the increase of temperature might lead to degradation of strength, which is similar to property of permanent dipole -dipole interactions and dipole - induced dipole interactions between polar interface. Analyzed from surface components of substrate and adhesion, there are some active groups between interfaces, which can form hydrogen bonds and Lewis acid - base interactions. While the number of active group is limited and the conditions to form covalent bond are poor, so the primary force between laminated glass interfaces is the secondary bonds force, which can be called physical adsorption force for short. On the other hand, there are some reasons weakening interfacial bonding such as weak surface edge, so the total bonding strength of laminated glass is interactive forces between adsorption and dis-adsorption of weak surface edge.The influences of Polyurethane (PU) and Polyvinyl Butyral (PVB) film on adhesion property of laminated glass were also investigated. The results indicate that PVB film is an excellent interlayer for glass, and PU film is a superior interlayer for Polycarbonate plate and organic-inorganic composites due to its great mechanical properties and surface properties.According to durability of glass surface, the ion exchange glass surface, in which potash served as enhancing ion, is researched, too. Under accelerating weathering conditions, appearances of glass surface and potash ion reaction are measured by Optical Microscopy and AAS respectively. The element contents of surface before and after exchange are studied by XPS.________________________________Abstract________________________________The research indicates that the surface of ion exchange glass is easier to be corroded than those of float glass. The reason of phenomenon above is: during exchange process, the surface of glass, dipped in KNOs electrolyte, absorbs a layer of K+ and forms Stern compact layer which is only severaldecadal A deep with great absorbability. It is for K ions still actively existing at surface after glass leaved solution and for OH" absorbed by K ions for charge balance that weakens surface durability of ion exchange glass greatly.Effects of interface properties on the adhesion of laminated glass have been investigated. Detailed testing methods of various components of solid surface energies (SFE) by contact angle (6) and the program to calculate that by computer are given. For polar materials low SFE studied in this paper, it indicates that the matching of corresponding polar parts plays primary role in the adhesion strength. Moreover, for the adhesion based on non-chemical reaction, the author brings forward a nondestructive method to evaluate adhesion strength.Finally, some advises are given to improve interfacial adhesion strength.