- 學位論文
奈米尺寸二氧化矽中孔洞材料、鋁溶膠/聚乙烯醇奈米複合材料之合成與鑑定
Synthesis and characterization of nanoscale mesoporous silica, colloidal alumina / poly(vinyl alcohol) nanocomposites
摘要
本論文研究的主題是在水溶性高分子聚乙烯醇(poly(vinyl alcohol)，PVA)中添加不同種類的鋁溶膠(Aluminasol 100及Aluminasol 520)及奈米尺寸二氧化矽中孔洞材料MCM-41(nanoscale mesoporous silica，簡稱NMS)，將其製成有機/無機奈米複合材料薄膜，探討添加的無機材料對奈米複合材料的熱穩定性、機械性、阻氣、阻水性有什麼影響及變化。 添加鋁溶膠Aluminasol 100 10 wt%時能有效地提高PVA的玻璃轉移溫度(Tg)，然而，熔點(Tm)卻下降，主要是因為無定型的Aluminasol 100會與PVA產生凡得瓦爾力和氫鍵作用力，而使PVA的主鏈變強，因此Tg升高，且為羽毛狀的Aluminasol 100也會插入PVA的規則結構中而使得PVA的結構結晶性降低(由XRD圖可證明)，因此，Tm就降低了。 添加NMS 10wt%於PVA中能有效地提高PVA的Tm、Td、貯存模數值，有效地降低氧氣、氮氣、水蒸氣的透過率及表面接觸角，主要是因為PVA不但會與NMS的表面產生凡得瓦爾力和氫鍵作用力，也會鑽到NMS的孔洞裡面產生相同的作用力，因而提升了熱穩定性及機械性質，再加上NMS能分散在PVA中，而使阻隔性質提升。另外，再將NMS進行不同官能基的表面改質(修飾)，探討表面具有極性或非極性官能基的NMS其分散的情況對其他性質的影響。
並列摘要
Here we report the homogeneous dispersion of nanoscale mesoporous silica (NMS) and colloidal alumina into PVA matrix to form novel PVA/NMS nanocomposites and PVA/ colloidal alumina nanocomposites via hydrogen bonding. The properties of the hybrids were studied in the film form as a function of the NMS and colloidal alumina concentration in the matrix polymer. The NMS and colloidal alumina concentration of the composites was varied from 0 to 10 wt %. The nanoscale mesoporous silica materials and colloidal alumina are characterized by X-ray powder diffraction (XRD) and transmission electron microscopy (TEM). Effects of the material composition on the thermal stability, mechanical strength, optical clarity, barrier properties of PVA along with a series of PVA/NMS nanocomposites and PVA/ colloidal alumina nanocomposites materials, in the form of fine powder and free-standing film, are also studied by TGA, DSC, DMA, UV–visible transmission spectra, GPA and VPA respectively. In addition, thermal, mechanical and barrier properties of the PVA were investigated after incorporation of the NMS and colloidal alumina.
參考文獻
延伸閱讀
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