Abstract
ABSTRACT The series of crystalline CTA oligomers (DS = 2−6) were prepared and characterized by 13 C CP/MAS NMR spectroscopy and X-ray analyses in order to obtain structural models of cellulose triacetate (CTA) in the solid state. Progressing toward hexamer, the NMR spectra of the oligomers, in comparison with CTA I and CTA II, gradually approached that of CTA I. In addition, X-ray diffractograms of the oligomers determined that the crystalline pentamer and hexamer have the CTA I lattice in spite of recrystallization from ethylacetate- n -hexane. We therefore concluded that the higher oligomers (DS > 4) of CTA would be useful models for CTA I structure.
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