Journal of Korea Technical Association of The Pulp and Paper Industry (펄프종이기술)

Korea Technical Association of the Pulp and Paper Industry (한국펄프종이공학회)
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Surface Modification of Cellulose Nanofibrils by Carboxymethylation and TEMPO-Mediated Oxidation

카르복시메틸화 및 TEMPO 촉매 산화 처리에 의한 셀룰로오스 나노피브릴의 표면 개질

  • Sim, Kyujeong (Dept. of Forest Sciences, Seoul National University) ;
  • Youn, Hye Jung (Dept. of Forest Sciences, Seoul National University) ;
  • Jo, Yeonhee (Dept. of Forest Sciences, Seoul National University)
  • 심규정 (서울대학교 농업생명과학대학 산림과학부) ;
  • 윤혜정 (서울대학교 농업생명과학대학 산림과학부) ;
  • 조연희 (서울대학교 농업생명과학대학 산림과학부)
  • Received : 2015.04.06
  • Accepted : 2015.04.23
  • Published : 2015.04.30
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Abstract

In this study, cellulose nanofibrils (CNF) were modified through carboxymethylation or TEMPO-mediated oxidation and their effects on ionicity and characteristics of sheet, film, and foam were investigated. Carboxymethylation was carried out on pulp fibers as a pre-treatment before preparation of CNF. The gel-like and translucent CNF hydrogel was obtained by grinding of carboxymethylated cellulose fibers. Carboxymethylated CNF film and freeze dried sheet showed higher transparency than that of untreated CNF. The CNF sheet with high strength and the CNF foam without large ice crystals were obtained by using the carboxymethylated CNF. TEMPO-mediated oxidation was carried out as a post-treatment of CNF. The zeta potential and charge demand of TEMPO-oxidized CNF were increased with an increase in oxidation time and addition amount of NaClO. The density of sheet made of TEMPO oxidized CNF was increased with the amount of oxidizing agent. The TEMPO oxidized cellulose nanofiber (TOCN) which was obtained from supernatant after centrifugation could be converted to transparent film.

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References

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