Wang Haohao, Hu Yunpeng, Xiong Tiancheng, Sun Dazhi
Guangdong Provincial Key Laboratory of Functional Oxide Materials and Devices, Department of Materials Science and Engineering, Southern University of Science and Technology, Shenzhen, Guangdong 518055, China.
Langmuir. 2025 May 13;41(18):11661-11673. doi: 10.1021/acs.langmuir.5c00876. Epub 2025 May 2.
This study develops a new type of poly(vinyl alcohol) (PVA) composite film by incorporating hydrophilic fumed silica and microfibrillated cellulose (MFC) as reinforcing agents through a low-cost synthesis method. The addition of these materials significantly enhanced the film's mechanical properties and hydrophobicity. A three-dimensional network structure formed by hydrogen bonding interactions between PVA, MFC, and silica led to notable improvements in tensile strength (71.1%) and Young's modulus (146%) in the optimal formulation with 5% MFC and 3% hydrophilic fumed silica. Additionally, the composite films exhibited a maximum water contact angle of 90.3°, indicating a significant reduction in the hydrophilicity and the development of a more hydrophobic surface. X-ray diffraction analysis confirmed that the incorporation of MFC and fumed silica enhanced the crystallinity of the PVA films, improving their structural stability. This work demonstrates the synergistic effect of MFC and hydrophilic fumed silica in PVA composite films, offering a promising solution for the development of sustainable packaging materials with improved mechanical and hydrophobic properties.
本研究通过一种低成本合成方法，将亲水性气相二氧化硅和微纤化纤维素（MFC）作为增强剂加入，开发出一种新型聚（乙烯醇）（PVA）复合膜。这些材料的加入显著提高了薄膜的机械性能和疏水性。在含有5% MFC和3%亲水性气相二氧化硅的最佳配方中，PVA、MFC和二氧化硅之间通过氢键相互作用形成的三维网络结构使拉伸强度（提高71.1%）和杨氏模量（提高146%）得到显著改善。此外，复合膜的最大水接触角为90.3°，表明亲水性显著降低，表面疏水性增强。X射线衍射分析证实，MFC和气相二氧化硅的加入提高了PVA薄膜的结晶度，改善了其结构稳定性。这项工作证明了MFC和亲水性气相二氧化硅在PVA复合膜中的协同作用，为开发具有改善机械性能和疏水性的可持续包装材料提供了一个有前景的解决方案。
