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  • 學位論文

二氧化矽-氧化鋁/水性聚氨酯複合材料之製備與性質研究

Preparation and Properties of SiO2-Al2O3/Waterborne Polyurethane Composite

指導教授 : 段葉芳

摘要


本研究利用Tetraethyl orthosilicate與Aluminium tri-sec-butoxide以溶膠-凝膠法合成三種二氧化矽-氧化鋁無機材料,並以IR、Raman、XRD與EDS鑑定結構與組成,再與水性聚氨酯形成複合材料,探討不同組成的二氧化矽-氧化鋁對水性聚氨酯的熱性質、機械性質與吸水性的影響。 利用TGA與DSC測量複合材料的熱性質,發現水性聚氨酯加入二氧化矽-氧化鋁無機材料後,熱裂解溫度與玻璃轉移溫度皆有上升的趨勢,其熱裂解溫度提10~20℃;玻璃轉移溫度提升10℃,且隨著無機材料中二氧化矽比例增加,熱穩定性隨之上升。 以拉伸試驗與硬度測試觀察複合材料的抗拉強度、楊氏係數與硬度,發現水性聚氨酯的機械性質會隨著二氧化矽-氧化鋁無機材料的加入而增加,其中抗拉強度增加42%、楊氏係數增加60%、硬度增加2.57倍。 由實驗結果得知,二氧化矽-氧化鋁無機材料能有效增加水性聚氨酯的熱穩定性與機械強度,也降低其吸水性,適合作為水性聚氨酯的強化材,增加水性聚氨酯的功能性。

並列摘要


The purpose of this study is to synthesize three kinds of SiO2-Al2O3 inorganic materials by the Sol-Gel method using Tetraethyl orthosilicate and Aluminium tri-sec-butoxide, their structures and component were identified by IR, Raman, XRD and EDS, composite were prepared by SiO2-Al2O3 and waterborne polyurethane, to investigate the effects of change the different SiO2/Al2O3 ratio on the thermal properties, mechanical properties and moisture absorption. The result are divided into three parts as follows: 1. The thermal properties of composites were measured by TGA and DSC, the thermal decomposition temperature and glass transition temperature of waterborne polyurethane both increase as SiO2-Al2O3 inorganic materials added into waterborne polyurethane, the thermal decomposition temperature increase 10~20℃, glass transition temperature increase 10℃. In addition, composite’s thermal stability increase as inorganic material’s SiO2 ratio rise. 2. The measurements by tensile tester and hardness testing, the mechanical properties of the composite increase as SiO2-Al2O3 inorganic materials added waterborne polyurethane. In the measurements, waterborne polyurethane’s tensile strength increased by 42%, Young’s modulus increase by 60%, hardness increase by 257%. 3. Experimental results indicate that adding SiO2-Al2O3 inorganic materials of waterborne polyurethane indeed enhance thermal stability and mechanical strength. Meanwhile, lowering the moisture absorption, be suitable for strengthening material, to improve performance of waterborne polyurethane.

參考文獻


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