Depth Profiling of Polymer Surfaces with FT-IR Spectroscopy

Abstract

INTRODUCTION The composition and structure at the surface of polymeric materials can vary with depth as a result of surface treatments, surface-specific processing variables, or thermodynamic forces active at the surface. For example, low molecular weight oils are applied to the surface of polymers for lubrication purposes. The distribution or depth gradient of the oil in the polymer depends on a variety of interacting factors, such as diffusion, solubility, temperature, chemical or physical interaction, porosity, etc. In the coatings and lamination industries, gradients can occur as a result of the direct deposition of Material A on the surface of Material B. When A does not mix with B, as is often desirable, the integrity of the surface is of importance. The thickness of the layer(s) and the sharpness of the interface(s) can be critical to the intended application of the material. Polymer surfaces are often treated to obtain specific surface properties. An example of this is in the corona poling of such...