Reinforcing Poly(methyl methacrylate) with Bacterial Cellulose Nanofibers Chemically Modified with Methacryolyl Groups

• Published in: Nanomaterials (Basel, Switzerland) Vol. 12; no. 3; p. 537
• Main Authors: Kono, Hiroyuki, Tsujisaki, Haruto, Tajima, Kenji
• Format: Journal Article
• Language: English
• Published: Switzerland MDPI AG 04.02.2022; MDPI
• Subjects: Cellulose; Cellulose fibers; cellulose nanofiber; Chloroform; Composite materials; Coupling agents; Elongation; Fiber composites; Fiber reinforced polymers; fiber-reinforced resin; Functional groups; High aspect ratio; Hydroxyl groups; Mechanical properties; Modulus of elasticity; Nanofibers; nanofibrillated bacterial cellulose; NMR; Nuclear magnetic resonance; organosilanes; poly(methyl methacrylate); Polymethyl methacrylate; Polymethylmethacrylate; Resins; Scanning electron microscopy; silane coupling agent; Software; Tensile strength; United States > US; Japan; Germany; cellulose nanofiber; poly(methyl methacrylate); nanofibrillated bacterial cellulose; fiber-reinforced resin; organosilanes; surface modification; silane coupling agent; nanofiller
• ISSN: 2079-4991; 2079-4991
• 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.