Green functionalization of cellulose nanocrystals for application in reinforced poly(methyl methacrylate) nanocomposites. (15th December 2018) - Wang, Wei
Highlights: Cellulose nanocrystals were carboxylated by a green process using L-malic acid. Degree of carboxylation of cellulose nanocrystals had great impact on PMMA hybrids Thermal and mechanical properties of nanocomposite films were effectively improved. Highly transparent PMMA nanocomposite films with high elongation were obtained. Abstract: Cellulose nanocrystals (CNC) were carboxylated through an organic solvent free esterification method usingl -malic acid (MA) to improve performance of transparent poly(methyl methacrylate) (PMMA) nanocomposites. A series of CNC carboxylated with a degree-of-substitution (DS) of 0, 0.035, and 0.20 were obtained. The presence of grafted carboxyl groups was characterized by Fourier transform infrared (FT-IR) spectroscopy and 13 C NMR analysis, meanwhile effects of content and DS of CNC on the structure, thermal, mechanical, and optical transparency properties of the nanocomposites were assessed. The results indicated that the homogeneous dispersion of CNC and a favorable PMMA-CNC interface were necessary to enhance the properties of nanocomposites. Facilitated through hydrogen bonding interactions, the resulting films demonstrated that a low percentage loading of CNC with high DS worked as effective reinforcing agents, producing stronger and tougher films than neat PMMA films, with an improved thermal stability and retention of good transparency.