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Authors
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Jariyavidyanont, K.; Janke, A.; Yu, Q.; Thurn-Albrecht, T.; Androsch, R.
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Title
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Lamellar morphology of disorder α′-crystals of poly(L-lactic acid)
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Date
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21.02.2024
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Number
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0
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Abstract
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Crystallization of poly(l-lactic acid) (PLLA) at temperatures lower and higher than about 100–120 °C leads to the formation of α′- and α-crystals, respectively. Related to the formation of different crystal polymorphs after crystallization at different temperatures, the small-angle X-ray scattering (SAXS) patterns only show a long-period maximum after crystallization at high temperatures, when α-crystals are present. Reason for the absence of a long-period peak after low-temperature crystallization is insufficient density contrast between the formed α′-crystals and the amorphous phase but not the absence of lamellar stacks and long-range periodicity. This conclusion is based on the observation of a long period after the transformation of α′-crystals of rather low density into α-crystals of higher density, by thermal treatment, while keeping the semicrystalline morphology quasi-unchanged. Long-range periodicity and formation of lamellae in PLLA containing α′-crystals are ultimately proven by atomic force microscopy, despite a long period is not detected by SAXS.
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Publisher
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American Chemical Society
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Wikidata
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Citation
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Crystal Growth & Design 24 (2024) 1825-1834
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DOI
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https://doi.org/10.1021/acs.cgd.3c01498
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Tags
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