KrF excimer laser photoablation of semicrystalline poly(ethylene 2,6-naphthalate) showed characteristic microstructures on the surface. These stable and well-defined structures were investigated with scanning electron microscopy, transmission electron microscopy (TEM), and x-ray photoelectron spectroscopy. The results of TEM analysis have revealed that the debris of the microstructures is composed of a polymer with a higher density.
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Niino et al. (1989) studied this question.
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