섬유

high-resolution solid-state **1**3c-nmr spectroscopy of cellulose nitrates

  • 출판일1999.03
  • 저자
  • 서지사항
  • 등록일 2016.11.02
  • 조회수 232
solid-state **1**3c-nmr spectroscopy has been used to investigate the structure of cellulose nitrates prepared from cotton linters. the solid-state technique has the advantage that the entire range of substitution can be studied, which is not possible at present by solution methods. the spectra change progressively with increasing degree of substitution (dos $equals$ 3 for cellulose trinitrate), and can be used to quantify the extent of substitution at c6, c2, and c3. progressive nitration leads to elimination of the original c6 resonances of native cellulose by dos $equals$ 1. 39 finally, development of intensity at 82 ppm at dos $equals$ 1. 83 is assigned to the effect of nitration at c3. there is no indication of any rearrangement of the unsubstituted regions analogous to those that occur on mercerization of native cellulose. 24 refs
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