- 學位論文
仿花瓣表面結構之電活性聚亞醯胺塗料其合成、鑑定及在金屬防蝕上之比較性研究
Synthesis, Characterization of Biomimetic Petal-Like Electro-active Polyimide Surface Coating and Their Comparative Studies in Corrosion Protection Application
摘要
本論文中，利用仿生模板法將兩種天然植物(即粉九曲及佳娜紅)的花瓣表面微結構移轉到電活性聚亞醯胺塗料的表面，接著並利用電化學量測技術來進行兩種具仿生微結構塗料在金屬防蝕上的比較性研究。 首先，利用氧化偶合法將胺基封端的苯胺三聚體合成出來，並以核磁共振光譜(NMR)、紅外光譜(FTIR)及質譜(MS)進行產物的結構鑑定。 其次，將所合成的苯胺三聚體與商品的二酸酐進行縮合聚合反應，以合成具電活性的聚亞醯胺塗料，之後並進行一系列高分子的結構鑑定。 在仿生模板製備方面，係利用聚二甲基矽氧烷(PDMS)作為軟模板材料，將粉九曲及佳娜紅的表面微結構轉移到電活性聚亞醯胺塗料並置於金屬材質上。 接著，進一步探討具花瓣仿生微結構之電活性聚亞醯胺塗料之表面型態、接觸角及金屬防腐蝕能力。 首先，利用掃描式電子顯微鏡(SEM)及原子力顯微鏡(AFM)觀察具花瓣仿生微結構之電活性聚亞醯胺塗料之表面型態，並以接觸角動態量測儀量測其水滴接觸角，以了解表面的親疏水特性，可得如下結論: 相較於平坦的的高分子塗層，具有仿生花瓣微結構的塗料其水滴接觸角分別明顯提昇了46度(粉九曲)與58度(佳娜紅)，即具佳娜紅微結構塗層比具粉九曲微結構塗層有較高的疏水性，因此本研究預期具佳娜紅微結構的仿生塗料可能在後端的防蝕量測上會有較好的結果。 在防腐蝕應用研究端，係利用電化學法量測具花瓣仿生微結構之電活性聚亞醯胺塗料量測塗層在鋼材上防蝕效果。 由電化學腐蝕實驗數據顯示，其結果大致可分兩方面來說明: (1) 兩種具有仿生花瓣微結構的電活性塗層皆較平坦無微結構的電活性塗層呈現較好的防蝕效果; (2) 具佳娜紅微結構的電活性聚亞醯胺(類似乳凸狀)塗層由於其疏水角度高達148度，相較於粉九曲扁平(類似樹支狀)之表面，因此，具有佳娜紅微結構的電活性塗層比具有粉九曲微結構的電活性塗層顯示更好的金屬防蝕效果。
並列摘要
In this dissertation, the nanocasting technique was used to transfer the pattern of petal surface micro- structure of two neutral plants (i.e., Rose of Grand Gala and Camellia of Fen Chiu Chu) into the surface of artificial electroactive polyimide (EPI) coating, followed by studying the anticorrosive effect through performing a series of electrochemical corrosion protection studies of hydrophobic EPI coating with biomimetic structures in saline conditions. First of all, the amine-capped aniline trimer (ACAT) was synthesized by oxidative coupling reactions, followed by characterized through nuclear magnetic resonance (NMR) spectroscopy, Fourier Transformation infrared (FTIR) spectroscopy and mass spectroscopy (MS). The EPI was subsequently prepared by imidization reaction between ACAT and commercial dianhydride, followed by carrying out a series of polymeric structural characterizations. Nanocasting technique was employed to transfer the micro-scaled patterns from two surface of natural plant petals with soft template of poly(dimethylsiloxane) (PDMS) to EPI coatings. Morphological images of EPI coating biomimetic surface structure was investigated by scanning electron microscopy (SEM) and atomic force microscopy (AFM). Superhydrophobicity of as-prepared coatings with two different biomimetic structures was measured and compared by contact angle of water droplets. It should be noted that the coating with biomimetic structure of Rose of Grand Gala petal was found to exhibited higher contact angle of water droplets as compared to that of Camellia of Fen Chiu Chu petal, implying that the coating with biomimetic structure of Rose of Grand Gala petal may revealed a better corrosion protection as compared to its counterpart. Moreover, corrosion protection effect of coatings with/without biomimetic structure was investigated by a series of electrochemical corrosion measurements.
參考文獻
延伸閱讀
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