2014年6月
Preparation of tough cellulose II nanofibers with high thermal stability from wood
CELLULOSE
- ,
- ,
- ,
- 巻
- 21
- 号
- 3
- 開始ページ
- 1505
- 終了ページ
- 1515
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1007/s10570-014-0222-6
- 出版者・発行元
- SPRINGER
Well-dispersed cellulose II nanofibers with high purity of 92 % and uniform width of 15-40 nm were isolated from wood and compared to cellulose I nanofibers. First, ground wood powder was purified by series of chemical treatments. The resulting purified pulp was treated with 17.5 wt% sodium hydroxide (NaOH) solution to mercerize the cellulose. The mercerized pulp was further mechanically nanofibrillated to isolate the nanofibers. X-ray diffraction patterns revealed that the purified pulp had been transformed into the cellulose II crystal structure after treatment with 17.5 wt% NaOH, and the cellulose II polymorph was retained after nanofibrillation. The cellulose II nanofiber sheet exhibited a decrease in Young's modulus (8.6 GPa) and an increase in fracture strain (13.6 %) compared to the values for a cellulose I nanofiber sheet (11.8 GPa and 7.5 %, respectively), which translated into improved toughness. The cellulose II nanofiber sheet also showed a very low thermal expansion coefficient of 15.9 ppm/K in the range of 20-150 A degrees C. Thermogravimetric analysis indicated that the cellulose II nanofiber sheet had better thermal stability than the cellulose I nanofiber sheet, which was likely due to the stronger hydrogen bonds in cellulose II crystal structure, as well as the higher purity of the cellulose II nanofibers.
- リンク情報
- ID情報
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- DOI : 10.1007/s10570-014-0222-6
- ISSN : 0969-0239
- eISSN : 1572-882X
- Web of Science ID : WOS:000336322800037