Surface Grafting of Cellulose Nanocrystals with Poly(ethylene oxide) in Aqueous Media

被引：204
作者：
Kloser, Elisabeth [1 ]
Gray, Derek G. [1 ]
机构：
[1] McGill Univ, Dept Chem, Montreal, PQ H3A 2A7, Canada
来源：
LANGMUIR | 2010年 / 26卷 / 16期
基金：
加拿大自然科学与工程研究理事会;
关键词：
MICROCRYSTALLINE CELLULOSE; MICROFIBRILS; SUSPENSIONS; HYDROLYSIS; WHISKERS;
D O I：
10.1021/la101795s
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
Aqueous suspensions of poly(ethylene oxide)-grafted nanocrystalline cellulose (PEO-grafted NCC) were prepared in order to achieve steric instead of electrostatic stabilization. A two-step process was employed: in the first step NCC suspensions prepared by sulfuric acid hydrolysis were desulfated with sodium hydroxide, and in the second step the surfaces of the crystals were functionalized with epoxy-terminated poly(ethylene oxide) (PEO epoxide) under alkaline conditions. The PEO-grafted samples were analyzed by conductometric titration, ATR-IR, solid-state NMR, MALDI-ToF MS, SEC MALLS, and A FM. The covalent nature of the linkage was confirmed by weight increase and MALDI-TOF analysis. The PEO-grafted cellulose nanocrystals (CNCs) formed a stable colloidal suspension that remained well dispersed, while the desulfated nanoparticles aggregated and precipitated. Upon concentration of the PEO-grafted aqueous NCC suspension, a chiral nematic phase was observed.
引用
收藏
页码：13450 / 13456
页数：7
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