- 學位論文
水性聚氨基甲酸酯／中孔洞分子篩奈米複合材料之合成與鑑定
Synthesis and Characterization of Water Borne Polyurethane/Mesoporous Molecular Sieves nanocomposites
摘要
本研究以水性聚胺基甲酸酯(WPU)作為基材，以添加不同含量奈米尺寸二氧化矽中孔洞材料MCM-41 (nanoscale mesoporous silica，簡稱NMS)，製備WPU/NMS中奈米複合材料。並利用NMS進行不同官能基的表面改質(修飾)而得到之M-NMS，使M-NMS由原先之插層效應，轉變成鏈結反應，形成WPU/M-NMS奈米複合材料。以XRD、FTIR、NMR、DSC、TGA、DMA及SEM/EDS，測定WPU/NMS之混成程度、熱性質及機械性質。並探討NMS與M-NMS對於各項加工性質之影響。 以添加不同含量NMS結果中，從XRD圖譜可得知，NMS之添加對於WPU之結構上並無太大之改變；而從熱分析結果中，發現當加入10 wt.% NMS奈米顆粒時，軟段Td提升36.83℃，熱重殘留量增加約20.87%；硬段Td提升26.32℃，熱重殘留量增加至13.59 wt.%。 以添加不同含量M-NMS結果中，從XRD圖譜可得知，M-NMS之添加會破壞WPU中之軟段結構；而從熱分析結果中，發現當WPU基材中含有10 wt% M-NMS時，其Td提升至489.19℃，裂解溫度提升約64.45℃，熱重殘留量增加至19.55 wt.%，亦較WPU的熱重殘留量(4.24 wt%)明顯的增加約15.31 wt.%，且Storage modulus提升約93%。
並列摘要
Waterborne polyurethane- nanoscale mesoporous silica nanocomposite materials were prepared by using nanoscale mesoporous silica nanoparticle of NMS and modified nanoscale mesoporous silica nanoparticle of M-NMS instead of clay. In this thesis, a novel segmented water base polyurethane / mesoporous material nanocomposite (WPU/NMS) based on 4,4′-methylenebis(cyclo hexyl isocyanate), polycaprolactone, dimethylolpropionic acid, triethylenetetramine, and mesoporous material. Mechanical properties, about mesoporous material in WPU results in a increase in the modulus as comfirmed by DMA studies. From TGA data, increasing of NMS content will shift Td to a much higher temperature. These phenomena is due to porous effect and high contacted area from mesoporous molecular sieves. Keywords：nanocomposite；mesoporous；polyurethane；modulus properties.