本文利用共沈澱法合成出陰離子型無機層狀黏土，水滑石；再以不同碳數的長鏈脂肪酸CH3(CH2)10COOH、CH3(CH2)14COOH、CH3(CH2)16COOH，將水滑石親水的表面改質為親油的有機水滑石，經XRD的分析，插入脂肪酸後的水滑石層間距離最大可達到3nm。
本研究亦利用有機水滑石經溶劑分散後，加入甲基丙烯酸甲酯單體(MMA)均勻混和，以AIBN起始溶液聚合(solution polymerization)合成聚甲基丙烯酸甲酯/水滑石奈米複合材料，經由XRD及TEM觀察出水滑石在聚甲基丙烯酸甲酯中為剝離型或插入型。
由TGA分析的結果，當外部高分子因溫度升高裂解時由於聚甲基丙烯酸甲酯的末端基被水滑石保護，加上水滑石本身的耐熱性質使得第一段的熱裂解溫度提升，較純的聚甲基丙烯酸甲酯熱裂解溫度提高了50℃。由DSC分析，加入水滑石會阻礙高分子的移動性，使玻璃轉移溫度Tg也較純聚甲基丙烯酸甲酯提高約20℃。由DMA測試，加入水滑石所形成奈米複材可增加聚甲基丙烯酸甲酯的彈性，較純的聚甲基丙烯酸甲酯能夠儲存更多能量最多高出1.35倍，而損失模數也比純聚甲基丙烯酸甲酯高出1.5倍。

Abstract
Our laboratory made of the coprecipition reaction to synthesize a number of organic acids intercalated layered anionic clays was called hydrotalcite (or LDH). Then LDH was intercalated with long chain fatty acids (CH3(CH2)nCOOH, n=10,14,16) between these layers to form organo-LDH. The modified LDH was characterized by X-ray diffraction that the fatty acids incorporation within the inter-gallery space resulted in a shift of d003 reflection from 0.77nm(Na2CO3-LDH) to about 3nm(organo-LDH).
Poly (methyl methacrylate)/LDH composites were prepared by solution polymerization of methyl methacrylate in the presence of fatty acids-modified LDH. This organic-inorganic hybrid, which contained a nanoscale dispersion of the LDH, was a material with greatly improved physical and mechanical characteristics.
The thermal properties of these PMMA/LDH nanocomposites were promoted by the presence of LDH. The TGA results indicated that the decomposition temperature of chain-end of the PMMA/LDH nanocomposite was higher than pure PMMA about 50℃. On the other hand, the LDH intercalated PMMA showed that the glass transition temperature (Tg) was higher than pure PMMA about 20℃.This resulted from the confinement of intercalated PMMA chains within the inter-galleries that prevented the segmental motions of the polymer chains. The mechanical properties were obtained from dynamic mechanical analysis. The storage modulus of PMMA/LDH was higher than pure PMMA. It depicted that the organophilic LDH can increase the mechanical properties of polymer materials.

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