FOURIER TRANSFORM INFRARED MICRO SPECTROSCOPY MAPPING STUDIES OF WEATHERED PVC CAPSTOCK TYPE FORMULATIONS II: OUTDOOR WEATHERING IN PENNSYLVANIA

摘要

FT-IR micro spectroscopy coupled with mapping techniques is a powerful methodology to evaluate dimensionally dependent changes such as those encountered in PVC weathering processes. It is based on the complexity and specificity of the infrared spectrum and the dimensional resolution of the microscope. This presentation will outline a systematic FT-IR study of changes observed during outdoor photo degradation of PVC siding capstock formulations, as a function of exposure time and TiO_2 level. The results will be compared with previously obtained accelerated QUV data. Profiles through the thickness dimension will be analyzed to identify degradation species and depth distribution.