A comparative guide to controlled hydrophobization of cellulose nanocrystals via surface esterification
作者： Shane X. Peng , Huibin Chang , Satish Kumar , Robert J. Moon , Jeffrey P. Youngblood
DOI: 10.1007/S10570-016-0912-3
关键词: Acid anhydride 、 Hildebrand solubility parameter 、 Reagent 、 Grafting 、 Transmission electron microscopy 、 Materials science 、 Infrared spectroscopy 、 Chemical engineering 、 Crystallinity 、 Polymer chemistry 、 Solid-state nuclear magnetic resonance 、 Polymers and Plastics
摘要: Surface esterification methods of cellulose nanocrystals (CNC) using acid anhydrides, chlorides, catalyzed carboxylic acids, and 1′1-carbonyldiimidazole (CDI) activated acids were evaluated with acetyl-, hexanoyl-, dodecanoyl-, oleoyl-, methacryloyl-functionalization. Their grafting efficiency was investigated Fourier-transform infrared spectroscopy 13C solid state NMR spectroscopy. Acid anhydride CDI found to be the most applicable reagents graft short long chain aliphatic carbons, respectively. The preservation structural morphology crystallinity grafted CNCs confirmed transmission electron microscopy X-ray diffraction. hydrophobicity by dispersing them in organic solvents different Hansen’s solubility parameters. dispersibility improved never-dried as source materials keep wet their washing after grafting, thus increasing solvency range disperse CNCs.
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