木质纤维素纳米纤丝的制备与表征  

Preparation and Characterization of Lignocellulose Nanofibril(LCNF)

作　　者：顾俐慧 金永灿[1] GU Li-hui;JIN Yong-can(Jiangsu Key Lab of Pulp and Paper Science and Technology,Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources,Nanjing Forestry University,Nanjing 210037,China)

机构地区：[1]南京林业大学江苏省制浆造纸科学与技术重点实验室江苏省林业资源高效加工利用协同创新中心,江苏南京210037

出　　处：《纤维素科学与技术》2018年第2期31-37,52,共8页Journal of Cellulose Science and Technology

基　　金：国家自然科学基金项目(31730106);国家自然科学基金项目(31470593);国家自然科学基金项目(21704045)

摘　　要：以麦草为原料,利用化学法脱除部分木质素,再进行超微粒研磨粉碎,制备不同木质素含量的纳米纤丝(LCNF),并探讨残余木质素对LCNF的形态、亲疏水性能和稳定性的影响。透射电镜分析结果表明研磨2次、磨盘间距-150μm、转速1 500 r/min为麦草碱预处理物料的最佳研磨条件。研究表明,机械法处理后,LCNF保留了纤维素Ⅰ型晶体结构。残余木质素抑制木质纤维素纳纤化程度,木质素含量高的LCNF尺寸分布不均匀,且分散液稳定性较差。然而,LCNF中的木质素增强了疏水性,对其扩大应用范围起到了促进作用。Lignocellulose nanofibrils（LCNFs） were produced from unbleached wheat straw fibers using a micro-grinder and characterized by transmission electron microscopy（TEM）, X-ray diffraction（XRD）, contact angle and Zeta potential. The LCNFs were determined to have diameters in the range of 5~40 nm. The optimal fibrillation conditions are as follows： Lignocellulose fibers were passed twice through a grinder at 1 500 r/min with the gap of the two disks adjusted to-150 μm. XRD results revealed that LCNF samples did not exhibit any evolution in their crystal structures. Residual lignin inhibited the degree of fibrillation of lignocellulose. The LCNF samples with high lignin content had non-uniform structures and poor stability. Among the LCNF samples, the hydrophobicity was higher for the samples with a greater lignin content.

关 键 词：木质纤维素纳米纤丝 预处理 机械法 残余木质素 

分 类 号：TQ352.6[化学工程]