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<p>A sulfated cellulose pulp (SCP) exhibiting ultra-high water retention properties has been developed, and its water retention mechanisms have been analyzed based on molecular structures determined by solid-state <sup>13</sup>C nuclear magnetic resonance (NMR). Cellulose pulp (CP) from wood is sulfated using a sulfamic acid and urea reaction system with varying concentrations of sulfamic acid. SCP has 1.04–1.93&#xa0;mmol/g of sulfate groups and exhibits a high water retention value (WRV) of 16,000%, which is approximately 100 times greater than that of CP. After the sulfate reaction, new peaks at 69&#xa0;ppm are observed in the <sup>1</sup>H–<sup>13</sup>C cross-polarization/magic angle spinning and dipolar decoupling/MAS (DDMAS) <sup>13</sup>C NMR spectra, which are assigned to the sulfated C6. Quantitative evaluation of area ratios of the corresponding peaks in the <sup>13</sup>C DDMAS NMR spectra indicates that approximately 18% of C6 in CP is maximally converted to sulfated C6 when R = 4.19. The present work demonstrates that the WRV is related to the amount of sulfated C6, which guides the design of future absorbent materials based on CP.</p>

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Sulfated cellulose pulp with ultra-high water retention characteristics

  • 期刊论文

  • 发表日期：

    2025年7月5日

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  • Sakura Morimitsu,
  • Ayato Nishimura,
  • Kenzo Deguchi,
  • Yuuki Mogami,
  • Shinobu Ohki,
  • Kenjiro Hashi,
  • Atsushi Goto,
  • Kazuhiko Yamada

摘要

A sulfated cellulose pulp (SCP) exhibiting ultra-high water retention properties has been developed, and its water retention mechanisms have been analyzed based on molecular structures determined by solid-state 13C nuclear magnetic resonance (NMR). Cellulose pulp (CP) from wood is sulfated using a sulfamic acid and urea reaction system with varying concentrations of sulfamic acid. SCP has 1.04–1.93 mmol/g of sulfate groups and exhibits a high water retention value (WRV) of 16,000%, which is approximately 100 times greater than that of CP. After the sulfate reaction, new peaks at 69 ppm are observed in the 1H–13C cross-polarization/magic angle spinning and dipolar decoupling/MAS (DDMAS) 13C NMR spectra, which are assigned to the sulfated C6. Quantitative evaluation of area ratios of the corresponding peaks in the 13C DDMAS NMR spectra indicates that approximately 18% of C6 in CP is maximally converted to sulfated C6 when R = 4.19. The present work demonstrates that the WRV is related to the amount of sulfated C6, which guides the design of future absorbent materials based on CP.