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| Fluorescence Illuminator Reveals Details of Contaminant Formations in Polypropylene Film |
| With the use of a Nicolet Continuμm IR microscope, equipped with fluorescence illumination, fish-eye defects in polypropylene film were investigated. |
| Polypropylene (PP) is a commonly occurring polymer used in a host of commercial products, including packaging films. Defects are commonly found in such films, drastically affecting their commercial value. Fourier transform infrared (FT-IR) microscopy is a powerful technique for investigating many of these defects, allowing the manufacturer to modify the processing conditions to minimize such defects.
A common defect in polymer sheets is a formation referred to as a “fish-eye.” Fish-eyes are circular blemishes or defects found on the surface of the polymer. The defects are the result of a contaminant particle, unreacted starting material, or a localized heterogeneity in the film. Once identified, the defects can often be controlled by altering the processing conditions. FT-IR microscopy has been successfully used to identify the contaminants and film heterogeneities that can lead to fish-eye formations. |
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