Nanocomposites from in-Situ Polymerization of Substituted Polyacetylene within Lamellar Surface of the Montmorillonite: A Solid-State NMR Study
Nanocomposites from in-Situ Polymerization of Substituted Polyacetylene within Lamellar Surface of the Montmorillonite: A Solid-State NMR Study
复制标题
蒙脱石层状表面内取代聚乙炔原位聚合的纳米复合材料：固态核磁共振研究
DOI：
10.1021/ma0258197
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发表时间：
2003
期刊：
影响因子：
5.5
通讯作者：
A. Cholli
中科院分区：
文献类型：
--
作者：
S. Sahoo;Dong Wook Kim;J. Kumar;A. Blumstein;A. Cholli
通过在层状铝硅酸盐如Ca 2 +−蒙脱土（MMT）存在下原位聚合2-乙炔基吡啶（2 EPy）制备的纳米复合材料通过固态13 C交叉极化/魔角旋转（CP/MAS）NMR光谱进行表征。研究了插层聚合物层的结构和动力学。通过分析本体插层和本体插层的聚2-乙炔基吡啶（P2 EPy）纳米复合材料的化学位移值之间的差异，对原位聚合法制备的纳米复合材料中聚合物组分的13 C NMR化学位移进行了归属。固体核磁共振和X-射线衍射研究的结果清楚地表明，2 EPy的蒙脱土的画廊内的自发聚合。由此形成的聚合物主要在布朗斯台德或刘易斯酸位点处结合到MMT表面。红外光谱分析表明，聚合物中的氮原子上带正电荷。
Nanocomposites prepared by in-situ polymerization of 2-ethynylpyridine (2EPy) in the presence of a layered aluminosilicate such as Ca2+−montmorillonite (MMT) were characterized by solid-state 13C cross-polarization/magic angle spinning (CP/MAS) NMR spectroscopy. The structure and dynamics of the polymer layer inserted between the montmorillonite lamellae were investigated. The 13C NMR chemical shifts of the polymer component of the nanocomposite that was prepared by in-situ polymerization were assigned by analyzing the difference between the chemical shift values of the bulk and bulk-intercalated poly(2-ethynylpyridine) (P2EPy) nanocomposite material. The results of solid-state NMR and X-ray diffraction studies clearly demonstrate a spontaneous polymerization of 2EPy within the galleries of MMT. The polymer thus formed is mostly bound to the surface of MMT at either the Bronsted or Lewis acid sites. Infrared analysis suggests the existence of positive charge on the nitrogen atom of the polymer inside the ...