溫感型無機氧化粉體表面改質技術及其在複合材料之應用

Preparation of Temperature-Sensitive Inorganic Nanoparticles and Application in Composite Materials

李文城(Wen-Chen Lee)

指導教授 ： 陳志恆

國立臺北科技大學/工程學院/材料及資源工程系所/碩士(2005年)

摘要

製造複合材料的前題是必須有一個良好的穩定分散體系，可以藉由奈米粉體的表面改質技術來達成此ㄧ目的。本研究嘗試利用中間介質3-氨丙基三乙氧基矽烷(APTES)，將溫感型高分子聚異丙基丙烯醯胺(Poly(NIPAAm))，接枝在SiO2的表面上。使得表面改質後之SiO2粉末成為溫感型的智慧材料，可藉由溫度的控制，來改變其親水性及疏水性。以獲得在不同親水性及親油性高分子單體中的良好分散體系。
將經過表面改質的SiO2粉末再分別與聚醯亞胺(親水性)及聚苯乙烯(疏水性)混合，經過聚合反應及脫除溶劑處理後，製備有機-無機複合材料。由實驗結果顯示，經過矽烷化及溫感型高分子表面改質的SiO2粉末，確實能藉由溫度的控制改變其表面性質。且因為矽烷基的解離，使得粉末表面的Zeta電位有越來越大的趨勢，其等電位點從30℃的pH 9.5下降到40℃時的pH 6.6。當SiO2粉末在溫度LCST以下時為親水性質，溫度升高至LCST以上時，粉末則為疏水性質，藉此特性將粉末分別添加到不同性質的有機材料中製備複合材料。並且因為SiO2在有機材料中穩定地分散而提升了複合材料的熱穩定性與機械性。

關鍵字

溶膠-凝膠法 ； 二氧化矽表面改質 ； 聚異丙基丙烯醯胺 ； 溫感型高分子 ； 有機-無機複合材料

並列摘要

Stable dispersion of inorganic nanoparticle in liquid phase is essential to prepare organic-inorganic composite materials. Surface modification of inorganic nanoparticle can enhance the stability of dispersion system. In this study, the surface of SiO2 was chemically modified by using 3-aminopropyl-triethoxysilan (APTES) as a coupling agent to attach temperature-sensitive polymer (poly (NIPAAm)) onto the surface of SiO2. Due to the temperature- sensitive nature of poly (NIPAAm), the surface properties of modified SiO2 particle will change from hydrophilic to hydrophobic in response to the temperature.
Experimental results showed that both silane surface modification and the temperature-sensitive polymer will change the surface properties of SiO2. Because of the dissociation of silane group, Zeta potential of SiO2 particle increases. The isoelectric point of SiO2 increases from pH 2.5 to pH 4.9. With temperature-sensitive polymer (poly (NIPAAm)), the isoelectric point of SiO2 particle decreases from pH 9.5 at 30℃ to pH 6.6 at 40℃. Temperature-sensitive SiO2 particle is hydrophilic when temperature is below LCST. When temperature is above LCST, temperature-sensitive SiO2 particle is hydrophobic. Therefore, by taking the advantage of this characteristic, poly (NIPAAm) modified SiO2 particle can be combined with either polyimide (hydrophilic) or polystyrene (hydrophobic), to prepare organic-inorganic composite materials with good mechanical properties.

並列關鍵字

Sol-gel ； surface modification of SiO2 ； poly(N-Isopropylacrylamide) ； temperature-sensitive polymer ； organic-inorganic composite materials

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