The optical properties of thermally crystallized polyethylene terephthalate (PET) were investigated using the methods of small‐angle light scattering, density, and haze measurements. The results indicate that the haze in crystallized PET results from scattering due to crystalline aggregates called spherulites. The formation of spherulites can lead to high levels of haze even at very low levels of crystallinity. A detailed analysis of polarized light‐scattering patterns was employed in order to define the various structural parameters responsible for haze. The relationships between haze, crystallinity, spherulite size, and volume fraction of spherulites were developed for PET.
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S. A. Jabarin (1982) studied this question.
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