<I>w</I>-十一烯酸表面改性纳米碳酸钙粒子反应机理的差示FTIR光谱研究

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摘要：采用差示傅里叶变换红外光谱(FTIR)法对w-十一烯酸表面改性的纳米碳酸钙粒子的组成进行了测试，结果发现：在其差谱上，波数位于1 572，1 542 cm^-1附近出现了较明显的(RCOO)²-Ca离子的特征吸收带，波数位于912，3 078 cm^-1附近分别出现了端双键上C—H的面外弯曲(γ_CH)和伸缩振动(ν_CH)吸收带，波数位于1 746，1 703 cm^-1附近分别出现了酯羰基和羧羰基的特征吸收带。由此推测,改性剂与纳米碳酸钙表面作用机理可能是：改性剂的端羧基与纳米碳酸钙表面的钙离子结合，形成(RCOO)²-Ca离子键，从而在纳米碳酸钙表面接枝上带有端双键的活性有机基团;同时，纳米碳酸钙表面利用氢键作用吸附微量有机基团。这些有机基团共同缠绕在纳米碳酸钙表面，提高了纳米碳酸钙在无水乙醇中的分散性。

关键词：差示FTIR光谱;纳米碳酸钙;表面改性;反应机理

Abstract：The components of the surface modified nanometer calcium carbonate particles with w-undecenoic acids as modifier were tested by differential FTIR spectroscopy. Some special absorption bands respectively assigned to (RCOO)²-Ca,γ_C—CH,ν_C—CH,ν_RCOOR,ν_RCOOH at the wavenumbers of 1 572,1 542,912,3 078 cm^-1,1 746 and 1 703 cm^-1 were found. The possible modification mechanisms is that the organic acid reacts with the exposed Ca²⁺ of the nano-CaCO³ surface to form ion-bond (RCOO)²Ca;and the other organic groups are absorbed onto the surface of nano-CaCO³ by hydrogen-bond. These organic groups twist on the surface of nano-CaCO³ particles. So the dispersion of the modified nano-CaCO³ particles is increased remarkably in absolute ethanol.

Key words：Differential FTIR spectroscopy;Nanometer calcium carbonate;Surface modification;Reaction mechanism

收稿日期: 2006-06-28 修订日期: 2006-09-28

中图分类号:

O561.3

通讯作者: 王经武 E-mail: jingwuwang@zzu.edu.cn

引用本文:

褚艳红^1,2,张国宝²,赵根锁²,余守志²,王经武^1*,李宾杰³ . w-十一烯酸表面改性纳米碳酸钙粒子反应机理的差示FTIR光谱研究[J]. 光谱学与光谱分析, 2007, 27(08): 1510-1513.
CHU Yan-hong^1,2,ZHANG Guo-bao²,ZHAO Gen-suo²,YU Shou-zhi²,WANG Jing-wu^1*,LI Bin-jie³ . Study on the Reaction Mechanism of Surface Modified Nano-CaCO³ Particles Using w-Undecenoic Acids as Modifier by FTIR Difference Spectroscopy. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2007, 27(08): 1510-1513.

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https://www.gpxygpfx.com/CN/Y2007/V27/I08/1510

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