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- W2000629759 abstract "Spherulites of poly(L-lactic acid) (PLLA) and of its blends with atactic poly(3-hydroxybutyrate) (a-PHB, from 10 to 75 wt %) were investigated by microfocus X-ray diffraction using synchrotron radiation. Radial scans in 5 microm steps with 3 microm beam diameter were performed. In PLLA, tens of identical diffraction images were collected. The unit cell a-axis was radially oriented, and the other axes lacked any specific orientation. In contrast, all PLLA/a-PHB blends showed a periodic change of diffraction pattern with increasing distance from the spherulite center. In all cases, the a-axis lay along the radius, while the b- and c-axes rotated about a with a defined periodicity. The unit cell twisting frequency increased with a-PHB content and closely matched the band spacing observed by polarized optical microscopy, which changed from 250 to 60 microm when the amount of a-PHB increased from 10 to 75 wt %. Concomitantly, a gradual broadening of all X-ray reflections was observed." @default.
- W2000629759 created "2016-06-24" @default.
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- W2000629759 date "2003-12-25" @default.
- W2000629759 modified "2023-09-25" @default.
- W2000629759 title "Structural Study of Poly(<scp>l</scp>-lactic acid) Spherulites" @default.
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- W2000629759 doi "https://doi.org/10.1021/bm0343951" @default.
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