Abstract
Microscopic observations of thermoplastic poly(ethylene terephthalate) reinforced with short E‐glass fibers revealed a unique matrix microstructure influenced by the orientation of densely packed glass fibers. The observed platelets tend to surround a fiber in a cylindrical sheath pattern. This observation of the crystalline platelet morphology is possible by the combination of ion‐etching and the shadowing effect of protruding fibers.

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