期刊
CARBOHYDRATE POLYMERS
卷 187, 期 -, 页码 133-139出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2018.01.081
关键词
Cellulose nanofiber; Board; Flexural strength; Dimensional recovery; Self-densification
A cellulose nanofiber board (CNF-board) with a nominal thickness of 3 mm was fabricated without adhesive or additive. To provide comparison, a cellulose fiber board (CF-board) was also fabricated. A novel cold pre-press apparatus was made to dewater highly absorbent CNF gel prior to drying. A mild drying condition in the vacuum oven at 70 degrees C and 0.005 MPa was enough to provide the CNF-board with a density of 1.3 g/cm(3) thanks to its self-densification capability. Unlike the CF-board, the fabricated CNF-board had a high water-activated dimensional recovery ratio (averagely 96%) during the five cyclic wetting-drying process. The flexural and tensile strengths of CNF-board obtained were 162 MPa and 85 MPa, respectively. The corresponding values for CF-board were 28 MPa and 11 MPa, respectively. The specific flexural and tensile strengths of CNF-board obtained were higher than those of CF-board as well as some other traditional wood-based composites, polymers and structural ASTM A36 steel.
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