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以聚己内酯为改性化合物研究接枝方法对Tempo氧化纳米纤维素表面极性的影响：酯化反应 点击化学

Study of the Effect of Grafting Method on Surface Polarity of Tempo-Oxidized Nanocellulose Using Polycaprolactone as the Modifying Compound: Esterification Click-Chemistry.

作者信息

Benkaddour Abdelhaq, Jradi Khalil, Robert Sylvain, Daneault Claude

机构信息

Lignocellulosic Materials Research Center, University of Quebec at Trois-Rivières, 3351 Boulevard des Forges, Trois-Rivières, QC G9A 5H7, Canada.

Canada Research Chair in Value-Added Papers, 3351 Des Forges, Trois-Rivières, Québec G9A 5H7, Canada.

出版信息

Nanomaterials (Basel). 2013 Dec 12;3(4):638-654. doi: 10.3390/nano3040638.

DOI:10.3390/nano3040638
PMID:28348357
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC5304593/
Abstract

Esterification and click-chemistry were evaluated as surface modification treatments for TEMPO-oxidized nanocelluloses (TONC) using Polycaprolactone-diol (PCL) as modifying compound in order to improve the dispersion of nanofibers in organic media. These two grafting strategies were analyzed and compared. The first consists of grafting directly the PCL onto TONC, and was carried out by esterification between hydroxyl groups of PCL and carboxyl groups of TONC. The second strategy known as click-chemistry is based on the 1,3-dipolar cycloaddition reaction between azides and alkyne terminated moieties to form the triazole ring between PCL and TONC. The grafted samples were characterized by transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), and Thermogravimetry analysis (TGA). Further, the effects of the two treatments on the surface hydrophobization of TONC were investigated by contact angle measurements. The results show that both methods confirm the success of such a modification and the click reaction was significantly more effective than esterification.

摘要

为了提高纳米纤维在有机介质中的分散性，以聚己内酯二醇（PCL）作为改性化合物，对酯交换反应和点击化学作为TEMPO氧化纳米纤维素（TONC）的表面改性处理方法进行了评估。对这两种接枝策略进行了分析和比较。第一种方法是将PCL直接接枝到TONC上，通过PCL的羟基与TONC的羧基之间的酯化反应来实现。第二种方法即点击化学，是基于叠氮化物和炔端基部分之间的1,3-偶极环加成反应，在PCL和TONC之间形成三唑环。通过透射电子显微镜（TEM）、傅里叶变换红外光谱（FTIR）、X射线光电子能谱（XPS）和热重分析（TGA）对接枝样品进行了表征。此外，通过接触角测量研究了这两种处理方法对TONC表面疏水化的影响。结果表明，两种方法均证实了这种改性的成功，且点击反应比酯化反应明显更有效。

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