Kono Hiroyuki, Tsujisaki Haruto, Tajima Kenji
Division of Applied Chemistry and Biochemistry, National Institute of Technology, Tomakomai College, Tomakomai 059-1275, Japan.
Graduate School of Chemical Sciences and Engineering, Hokkaido University, Sapporo 060-8628, Japan.
Nanomaterials (Basel). 2022 Feb 4;12(3):537. doi: 10.3390/nano12030537.
Nanofibrillated bacterial cellulose (NFBC), a type of cellulose nanofiber biosynthesized by sp., has extremely long (i.e., high-aspect-ratio) fibers that are expected to be useful as nanofillers for fiber-reinforced composite resins. In this study, we investigated a composite of NFBC and poly(methyl methacrylate) (PMMA), a highly transparent resin, with the aim of improving the mechanical properties of the latter. The abundant hydroxyl groups on the NFBC surface were silylated using 3-(methacryloyloxy)propyltrimethoxysilane (MPTMS), a silane coupling agent bearing a methacryloyl group as the organic functional group. The surface-modified NFBC was homogeneously dispersed in chloroform, mixed with neat PMMA, and converted into PMMA composites using a simple solvent-casting method. The tensile strength and Young's modulus of the composite increased by factors of 1.6 and 1.8, respectively, when only 0.10 wt% of the surface-modified NFBC was added, without sacrificing the maximum elongation rate. In addition, the composite maintained the high transparency of PMMA, highlighting that the addition of MPTMS-modified NFBC easily reinforce PMMA. Furthermore, interactions involving the organic functional groups of MPTMS were found to be very important for reinforcing PMMA.
纳米原纤化细菌纤维素（NFBC）是一种由 sp.生物合成的纤维素纳米纤维，其纤维极长（即高长径比），有望用作纤维增强复合树脂的纳米填料。在本研究中，我们研究了NFBC与聚甲基丙烯酸甲酯（PMMA，一种高度透明的树脂）的复合材料，目的是改善后者的机械性能。使用3-(甲基丙烯酰氧基)丙基三甲氧基硅烷（MPTMS，一种带有甲基丙烯酰基作为有机官能团的硅烷偶联剂）对NFBC表面丰富的羟基进行硅烷化处理。将表面改性的NFBC均匀分散在氯仿中，与纯PMMA混合，并使用简单的溶剂浇铸法制成PMMA复合材料。当仅添加0.10 wt%的表面改性NFBC时，复合材料的拉伸强度和杨氏模量分别提高了1.6倍和1.8倍，同时最大伸长率并未降低。此外，该复合材料保持了PMMA的高透明度，这突出表明添加MPTMS改性的NFBC能够轻松增强PMMA。此外，发现涉及MPTMS有机官能团的相互作用对于增强PMMA非常重要。
