State Key Lab of Pulp and Paper Engineering, South China University of Technology, Guangzhou, China.
ACS Appl Mater Interfaces. 2013 Apr 10;5(7):2527-34. doi: 10.1021/am302967m. Epub 2013 Mar 21.
We used a new cellulosic material, cellulosic solid residue (CSR), to produce cellulose nanofibrils (CNF) for potential high value applications. Cellulose nanofibrils (CNF) were produced from CSR recovered from the hydrolysates (waste stream) of acid hydrolysis of a bleached Eucalyptus kraft pulp (BEP) to produce nanocrystals (CNC). Acid hydrolysis greatly facilitated homogenization to fibrillate CSR to CNF with only 15 passes in a microfluidizer compared with at least 47 passes to fibrillate BEP to nanofibrils. CNF from CSR were nanowhiskers with a length between 50 and 400 nm and a diameter 3-10 nm with limited aggregation while CNF from BEP were entangled networks of nanofibrils with a length of 500-1000 nm and a diameter of 10-50 nm. CNFs from CSR had good spectral transparency from UV to infrared, i.e, transmittance of CNF-CSR suspensions at 0.1% solids consistency is greater than 90% at wavelengths greater than 340 nm, compared with less than 30% for CNF suspension produced from BEP. Specific tensile strength and modulus of CNF films from CSRs reached 75 kN·m/kg and 12 MN·m/kg, respectively, approximately 175% of the respective values for conventional paper made of refined BEP.
我们使用了一种新型的纤维素材料，即纤维素固体残渣（CSR），来生产纤维素纳米纤维（CNF），以实现潜在的高价值应用。纤维素纳米纤维（CNF）是从酸水解漂白桉木硫酸盐浆（BEP）水解产物（废水流）中回收的纤维素固体残渣（CSR）中生产的纳米晶体（CNC）。酸水解极大地促进了均化，使得 CSR 纤维素纳米纤维化，只需在微流仪中通过 15 次处理，而将 BEP 纤维素纳米纤维化则需要至少 47 次处理。CSR 制得的 CNF 是纳米线，长度在 50nm 到 400nm 之间，直径 3nm 到 10nm，聚集程度有限，而 BEP 制得的 CNF 则是纳米纤维的缠结网络，长度在 500nm 到 1000nm 之间，直径在 10nm 到 50nm 之间。CSR 制得的 CNF 具有从紫外线到红外线的良好光谱透明度，即，在 0.1%固含量的情况下，CSR-CNF 悬浮液的透光率在大于 340nm 的波长下大于 90%，而 BEP 制得的 CNF 悬浮液的透光率则小于 30%。CSR 制得的 CNF 薄膜的比拉伸强度和模量分别达到了 75kN·m/kg 和 12MN·m/kg，分别约为用精制 BEP 制成的传统纸张的相应值的 175%。
