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• W2077217263 abstract "Abstract The structure of uniaxially oriented poly( l -lactic acid) (PLLA) with different drawn ratios was studied in the solid state using 13C NMR spectroscopy. The spectra of uniaxially oriented PLLA films were observed by changing the angle between the draw direction of the samples and the magnetic field. The observed spectra of the samples with draw ratios of 3 and 4 were well reproduced by the simulated spectra, indicating the presence of two kinds of oriented components and one unoriented component in these samples. The angles, θCO, between the CO bond direction of PLLA and the oriented axis of the chain were calculated to be 132 and 128° for two oriented components, respectively, by assuming that the chemical shift tensor direction relative to the molecular symmetry axis of the carbonyl carbon nucleus of PLLA was the same as that for the carbonyl carbon of poly(ethylene terephthalate) reported previously. The angles, 132 and 128°, are in agreement with the reported angles for PLLA 31 helix model in the β form and PLLA 103 helix model in the α form, respectively. The relatively small value of p (characterizing the distribution of the fiber axis) obtained in the simulation indicates the high orientation in the oriented domain in the PLLA film samples. The fraction of each component in the samples was also determined." @default.
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• W2077217263 date "2000-02-01" @default.
• W2077217263 modified "2023-10-16" @default.
• W2077217263 title "Carbon-13 solid state NMR study on uniaxially oriented poly(l-lactic acid) films" @default.
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• W2077217263 doi "https://doi.org/10.1016/s0032-3861(99)00227-x" @default.
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