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- W2050244879 abstract "Time-resolved synchrotron simultaneous wide-angle X-ray diffraction (WAXD) and small-angle X-ray scattering (SAXS) experiments were used to investigate the crystallization behavior and microstructure development of poly(l-lactide), PLLA, and two random copolymers containing l-lactide (predominately) and randomly placed R stereochemical defects. The general features of crystallization of PLLA and the copolymers are similar except that the copolymers crystallize much more slowly and to a lesser extent than PLLA, as expected. Lamellar thicknesses derived from SAXS experiments are in very good agreement with mean thicknesses determined in a tapping mode AFM study of the same materials. The reduction in lamellar thickness and crystallinity with increasing meso-lactide content supports significant exclusion of the R stereoisomer from crystalline lamellae. In a separate series of time-resolved WAXD/SAXS experiments, each (co)polymer was crystallized for a fixed time, then heated to above its melting point. The observed behavior suggests a model for crystallization of the copolymers in which thinner lamellae form between ‘primary’ lamellar stacks during crystallization, with an average lamellar thickness that decreases with increasing R stereoisomer content." @default.
- W2050244879 created "2016-06-24" @default.
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- W2050244879 date "2003-01-01" @default.
- W2050244879 modified "2023-10-10" @default.
- W2050244879 title "Crystallization and structure formation of poly(l-lactide-co-meso-lactide) random copolymers: a time-resolved wide- and small-angle X-ray scattering study" @default.
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- W2050244879 doi "https://doi.org/10.1016/s0032-3861(02)00823-6" @default.
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