Summary: Transcrystallinity in UHMWPE fiber‐reinforced HDPE composites promotes a significant β transition that is untypical of high‐density polyethylene. Surface profiling by atomic force microscopy identifies two distinct morphologies in the composite without a boundary phase between them, which coincide with the transcrystalline layer and with the bulk spherulitic matrix. As a result, the claim that attributes this transition to loose chain folds at the lamella surface is favored.Atomic force microscopy scan of the transcrystalline layer above the fiber with the impression of the fiber in the center.magnified imageAtomic force microscopy scan of the transcrystalline layer above the fiber with the impression of the fiber in the center.
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