多重内反射红外光谱原位研究聚合物/金属界面水的动态行为

APPLICATION OF FTIR-MIR FOR IN SITU MEASUREMENT OF WATER AT POLYMERIC COATING/METAL INTERFACE

将多重内反射富里叶交换红外光谱（ＦＴＩＲ－ＭＩＲ）原位测量技术，首次用于原位研究聚合物／金属界面水分子的动态行为。实验表明，随着聚合物／金属复合体系在水中浸渍时间的延长，聚合物／金属界面水分子不断增加累积形成一定厚度的水层，同时聚合物／金属界面的聚合物量递减，说明水进入界面便聚合物对金属基底的粘合键破坏，粘合作用减弱。不同的聚合物对水的阻挡能力可明显不同，水通过环氧树脂膜层的速度远小于通过醇酸树脂膜层的速度。原位ＦＴＩＲ－ＭＩＲ技术可作为研究聚合物／金属等复合体系界面的一种重要手段，有可能提供聚合物膜层中水的传输过程、水在界面上的递增累积过程、聚合物粘合用的破坏过程以及有关聚合物／金属界面腐蚀破坏过程的分子水平的信息。

A new technique was developed bassed on Fourier transform infrared spectroscopy in the multiple internal reflection mode (FTIR-MIR) for measuring in situ water at the polymeric coating/metal interface.Water amount at the interface increased with increasing exposure time in water. The adhesion between polymer and metal surface was weakened when water accumulated at the interface. The ability to prevent water for the epoxy/metal system was much higher than that for the alkyd/metal one. The method was found useful for determining the degradation process of the coating/metal system and its related effecting factors.