含有纤维状纳米原纤化纤维素的 PVA 复合材料的增强热学和力学性能。
Enhanced thermal and mechanical properties of PVA composites formed with filamentous nanocellulose fibrils.
机构信息
Material Science and Engineering College, Northeast Forestry University, Harbin 150040, China; College of Mechanical and Electrical Engineering, Northeast Forestry University, Harbin 150040, China.
Material Science and Engineering College, Northeast Forestry University, Harbin 150040, China.
出版信息
Carbohydr Polym. 2014 Nov 26;113:403-10. doi: 10.1016/j.carbpol.2014.07.031. Epub 2014 Jul 22.
Long filamentous nanocellulose fibrils (NCFs) were prepared from chemical-thermomechanical pulps (CTMP) using ultrasonication. Their contribution to enhancements in thermal stability and mechanical properties of poly(vinyl alcohol) films were investigated. The unique chemical pretreatment and mechanical effects of CTMP loosen and unfold fibers during the pulping process, which enables further chemical purification and subsequent ultrasound treatment for formation of NCFs. The NCFs exhibited higher crystallinity (72.9%) compared with that of CTMP (61.5%), and had diameters ranging from 50 to 120 nm. A NCF content of 6 wt% was found to yield the best thermal stability, light transmittance, and mechanical properties in the PVA/NCF composites. The composites also exhibited a visible light transmittance of 73.7%, and the tensile strength and Young's modulus were significantly improved, with values 2.8 and 2.4 times larger, respectively, than that of neat PVA.
长丝状纳米纤维素纤维（NCFs）是通过超声处理从化学热机械浆（CTMP）制备的。研究了它们对聚乙烯醇（PVA）薄膜热稳定性和机械性能的增强作用。CTMP 在制浆过程中的独特化学预处理和机械作用使纤维松解和展开，从而可以进行进一步的化学纯化和后续的超声处理以形成 NCFs。与 CTMP（61.5%）相比，NCFs 的结晶度更高（72.9%），直径范围为 50 至 120nm。发现 NCF 含量为 6wt%时，PVA/NCF 复合材料具有最佳的热稳定性、透光率和机械性能。复合材料的可见光透过率也达到了 73.7%，拉伸强度和杨氏模量显著提高，分别比纯 PVA 提高了 2.8 倍和 2.4 倍。
Zotero 插件