Abstract
FT-IR microspectroscopy systems have been used for a wide range of polymer applications. Reffner et al reported a quantitative reflectance technique for the determination of ethylene/vinyl acetate copolymer. Chase, using an infrared polarizer with the microscope, studied single polymer fibers and was able to determine the orientation of functional groups relative to the fiber axis. Brasch and Lustiger also used FT-IR microspectroscopy in conjunction with an IR polarizer to determine the percentage of tie molecules in polyethylene. The relative amount of tie molecules is an important parameter for understanding the mechanical failure of polyethylene and the FT-IR microscope improves the sensitivity of this measurement by confining the analysis to the areas of the sample which undergo the greatest change.In the present study the IRμs™ microanalysis system was used to explore the effects of environmental and mechanical stresses upon the molecular structure of polymers. A sample of polypropylene which was weathered for two years was microtomed and the cross section studied for indications of degradation.
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