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• W2030347568 abstract "Morphological evolution of poly(l-lactic acid) (PLLA) crystals obtained via crystallization at Tc = 85 to 97 °C from 0.1% solutions in mixed xylene was closely followed via transmission electron microscopy. Upon stirring-enhanced nucleation after the adopted incubation scheme (ti = 10 h at Ti = 90 °C), there emerged “a axis” lenticular crystals of the imperfectly packed α form, as indicated by the presence of the presumably forbidden (010) spot in the selected-area electron diffraction along the [001] zone. Subsequently observed during further growth was a gradual change from lenticular to truncated lozenge with {100} and {110} facets, driven by the outward propagation of the thickened interior (truncated lozenge in shape) within the lenticular crystal. The width of the {100} facets clearly decreased with decreasing Tc, resulting in rhombic lozenges with {110} edges at 87 °C. This change in faceting habit is interpreted in terms of the competition between primary growth (controlled by surface-nucleation) and interior thickening (controlled by the reeling-in of chains from the primary thin rim via slip diffusion on the {110} surfaces). Eliminating the stirring- enhanced nucleation procedure, we have observed direct transition from lenticular to rhombic lozenge crystals at Tc = 85 °C without interior thickening, that is, bypassing entirely the truncated lozenge stage. It is hence proposed that the lamellar thickening is intrinsically a nucleation-and-growth process, initiated by the (presumably thick) nucleus from stirring, followed by the reeling-in process of stems in the rim. The supercooling dependence of the reeling-in rate is anisotropic and decreases most significantly along [100] directions with increasing Tc. Therefore, the {100} facets of truncated lozenge develop wider at higher Tc." @default.
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• W2030347568 date "2010-02-09" @default.
• W2030347568 modified "2023-09-26" @default.
• W2030347568 title "Thickening-Induced Faceting Habit Change in Solution-Grown Poly(<scp>l</scp>-lactic acid) Crystals" @default.
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• W2030347568 doi "https://doi.org/10.1021/ma902052a" @default.
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