Effects of Size and Dispersity of Microcrystalline Celluloses on Size, Structure and Stability of Nanocrystalline Celluloses Extracted by Acid Hydrolysis

摘要

Nanocrystalline celluloses (NCCs) were separated from four commercial microcrystalline celluloses(MCCs) by an acid hydrolysis–sonication treatment. Transmission electron microscopy(TEM), atomic force microscopy (AFM), Fourier transform infrared (FTIR) spectrum, X-raydi®raction (XRD) and thermogravimetric analysis (TGA) were conducted to investigate theNCCs. MCCs with di®erent morphologies and particle sizes showed di®erent aggregation degrees.The aggregation of MCCs followed the order MCC1 > MCC3 > MCC2 > MCC4, which is thesame order of the heights of the resulting NCCs. The best uniformity and thermal stability werecharacterized for NCC3, which was produced by MCC3 with smallest original particle size andgood dispersity among the four MCCs. This result suggests that both the original particle size anddispersity of MCCs had signi¯cant e®ects on separated NCCs.