ABSTRACT

The effect of cyclic moisture-absorption/desorption on adhesive strength was investigated using water at 23°C. Bulk plates and open face lap joints were prepared using epoxy adhesive, and their weight transition and shear strength were measured. The diffusion coefficient of the absorption process increased with the number of cycles and reached a constant value. In contrast, the diffusion coefficient of the desorption process was not affected by the number of cycles. As a part of the calcium carbonate disappeared from the surface, the weight of the bulk plates was reduced, and this weight reduction was irreversible. However, the strength of the lap joint was not significantly damaged by moisture absorption at 23°C.

摘要

使用 23°C 的水研究了循环吸湿/解吸对粘合强度的影响。使用环氧树脂粘合剂制备散装板和开面搭接接头，并测量它们的重量转变和剪切强度。吸收过程的扩散系数随着循环次数的增加而增加并达到一个恒定值。相反，解吸过程的扩散系数不受循环次数的影响。随着部分碳酸钙从表面消失，块状板的重量减少，这种重量减少是不可逆的。然而，搭接接头的强度并未因 23°C 的吸湿而显着受损。