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    Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/3505


    Title: 蒙脫土/環氧樹脂、蒙脫土/聚苯胺和聚苯胺管奈米材料之研究;The study of montmorillonite/epoxy, montmorillonite/polyaniline and polyaniline tubes in nano-materials
    Authors: 陳岡宏;Kang-Hung Chen
    Contributors: 化學工程與材料工程研究所
    Keywords: 氧化鋁膜;黏土;蒙脫土;聚苯胺;奈米複合材料;anodic alumina membranes;TEM;ESR;polyaniline;nanocomposites;diferential scanning calorimetry (DSC);clay;thermogravimetric analysis (TGA)
    Date: 2003-01-10
    Issue Date: 2009-09-21 12:17:15 (UTC+8)
    Publisher: 國立中央大學圖書館
    Abstract: 本論文的研究內容分為兩個方向,一方面將黏土分散至環氧樹脂中形成奈米複合材料,另一方面以黏土或氧化鋁膜為模板合成聚苯胺導電性高分子。 第一部份主要以有機胺類嵌入蒙脫土層間而改質蒙脫土以利黏土層之分散,並合成蒙脫土/環氧樹脂奈米複合材料。由實驗結果可以觀察到蒙脫土層間距的大小受到嵌入有機胺分子鏈長度和電荷密度影響,有機胺分子鏈越長、電荷密度越小會得到大的層間距。在以CH3(CH2)17NH3+改質蒙脫土和環氧樹脂聚合成的複合材料中可以看出,複合材料中的蒙脫土層間距可擴大到~50 Å, Tg可以從108.4℃提昇到117.4℃,此外,對於阻水性也有相當的提昇。也以各式團聯共聚物嵌入蒙脫土層間,探討不同電荷密度、不同電性、不同鏈長和不同結構,對於蒙脫土層間距的影響,結果顯示決定層間距的首要因子為層間靜電作用力。而蒙脫土能在環氧樹脂基材中分散,這要歸因於共聚物將黏土表面疏水化,使層間容納更多環氧樹脂並擴大層間距,TEM影像可以看到層間距>200 Å,顯示黏土層分散在基材中。測試其性質時也發現添加少量修飾過的蒙脫土於環氧樹脂基材中可提昇Tg,而其阻水性較未修飾蒙脫土的複合材料佳,也有較佳之透光度。 論文中第二部份以有機胺改質蒙脫土使蒙脫土提高吸附苯胺單體的含量,而在層間合成的聚苯胺量增多。本研究以含有羧基(-COOH)的HOOC(CH2)11NH3+幫助蒙脫土吸附最多苯胺單體,因而合成最多的聚苯胺於層間,ESR的結果說明層間聚苯胺的訊號確有比較狹窄的線寬,顯示聚苯胺/蒙脫土複合材料中聚苯胺的自由基陽離子非定域化的程度提高。另外,也研究以蒙脫土修飾電極,並以電化學法聚合苯胺,以獲得更高的反應電流。先將鉑原子嵌入黏土層間再合成聚苯胺,循環伏安圖譜顯示可將反應電流提高了315%,可相當的提昇電極的靈敏度,使得導電性高分子在感測器上的應用,具有更佳的靈敏度。 最後以商業化氧化鋁濾膜為模板,以化學方法和電化學方法合成聚苯胺管,SEM的影像顯示電化學方式和化學方式皆成功合成出聚苯胺管。 Two main topics are studied in this thesis, one topic is dispersion of the clay layers in epoxy matrix to form nanocomposites, another topic is using clay or anodic aluminum oxide membrane as templates to synthesize conducting polyaniline. In the first part, onium ions are intercalated into the clay layers in order to modify the clay layers for dispersion in polymer matrix. Montmorillonite/epoxy nanocomposites are formed. The d-spacing between the clay layers was affect by chain length and charge density of the onium ions. The longer chain length and lower charge density onium ions modified clay show larger d-spacing. An epoxy/montmorillonite nanocomposite is synthesized by heating a mixture of [H3N(CH2)17CH3]+modified montmorillonite with epoxy monomer and curing agent. TEM photographs show that the spacing between the clay layers was further enlarged to about 50 Å. Glass transition temperature (Tg) of the nanocomposite containing 5 phr of [H3N(CH2)17CH3]+modified montmorillonite change from 108.4℃ of epoxy resin to 117.4℃. The nanocomposite possesses higher water resistance than the epoxy and unmodified montmorillonite composite. Nanocomposite also shows higher light transmittance. The improvements of the above properties can be evidenced for the formation of nano-scale composite. Acrylic block copolymers are also intercalated into the layers of montmorillonite in order to study the effects of charge density, chin length and structure. The results indicate that primary factor to affect the d-spacing of clay is electrostatic intercalation. Nanocomposites of epoxy and clay modified with block copolymers were synthesized. When modified clay contents are below 2 phr, Tg higher than 131.7 oC can be obtained. Water resistance and light transmittance of the nanocomposite is also improved. In the second parts, nanocomposites of polyaniline/montmorillonite were synthesized with onium ion modified montmorillonite. More aniline was absorbed between the clay layers of modified montmorillonite. After polymerization of aniline, TEM photographs of the composites show distances of 60-140 Å between the clay layers. TG results show more polyaniline are formed between the modified clay layers, especially for HOOC(CH2)11NH3+ modified clay. ESR results show narrow linewidth of polyaniline intercalated between the clay layers. We also synthesize polyaniline electrochemically in platinum containing montmorillonite to enhance the response current of the electrode. The cyclic voltammogram (CV) shows that improvement of the response current by 315 % was observed for polyaniline in Pt containing montmorillonite. Synthesis of polyaniline tubes in anodic aluminum oxide membranes by chemical and electrochemical methods were also studied. SEM images show that uniform polyaniline tubes with diameter about 200 nm were synthesized successfully.
    Appears in Collections:[化學工程與材料工程研究所] 博碩士論文

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