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Appearance of PLA fibers. (1) PLLA/PDLA-60-2-210 fibers (original length 1.1 cm), (2) PLLA/PDLA-60-2-210 fibers (heated at different temperatures), (3) PLLA-130 fibers (heated at different temperatures), (4) PLLA-130 fibers (original length 4.3 cm).
