- 學位論文
聚苯胺/黏土奈米複合材料與聚苯胺/二氧化矽奈米複合材料之製備與物性之比較性研究
Comparative Studies on the Preparation and Properties of Polyaniline/Clay and Polyaniline/Silica Nanocomposite Materials
摘要
本論文主要是探討經有機改質後的層狀黏土與球狀二氧化矽在導入聚苯胺後，其對於整體塗料防腐蝕能力的提升，並將兩者之防腐蝕性能做一系統性的比較。研究中利用經改質過的二氧化矽與黏土導入聚苯胺中以製備成聚苯胺/二氧化矽奈米複合材料與聚苯胺/黏土奈米複合材料。 本研究將探討所製備之奈米複合材料在變溫下之防腐蝕性質及氣體阻隔性質,首先,將聚苯胺/二氧化矽與聚苯胺/黏土奈米複合材料以傅利葉轉換紅外線光譜儀(FT-IR)與固態核磁共振光譜儀(13C-NMR、29Si-NMR)做基本化學結構鑑定，接著利用廣角X-ray繞射儀(WAXRD)觀察黏土層間距離的變化,最後利用穿透式電子顯微鏡(TEM)來進一步觀察二氧化矽與黏土分散在聚苯胺中之分散形態；在性質研究方面，以循環伏特電位儀(CV)、電化學阻抗(EIS)、氣體透過率分析儀(GPA)、水氣透過率分析儀(VPA)、接觸角量測(Contact angle)做一系列物性之量測；最後使用紫外光/可見光光譜儀(UV)來進行光學性質的分析；綜合所有量測結果顯示，添加改質後的二氧化矽與黏土之聚苯胺奈米複合材料確實能有效提升整體的防腐蝕性能、氣體阻隔性質、及透光率。 而加入改質後之黏土聚苯胺奈米複合材料則因為黏土是層狀結構有較長視徑比的特性,因此在防腐蝕性能、電化學阻抗、氣體透過率等比加入改質後之二氧化矽聚苯胺奈米複合材料有更佳的物性表現。
關鍵字
無並列摘要
In this study, we introduce dispersed phase of organoclay and amino-modified silica into polyaniline matrix to prepare a series of polyaniline/clay (CLAN) and polyaniline/silica (AMS) nanocomposite. The as-prepared CLAN and AMS nanocomposite films were prepared by conventional chemical oxidation in the presence of organoclay platelets and amino-modified silica particles . The synthesized composite materials were subsequently investigated with a series of characterized techniques, including wide-angle X-ray diffraction (WAXRD), Fourier Transform Infrared spectroscopy (FTIR), solid-state 13C-nuclear magnetic resonance (13C-NMR), 29Si-NMR spectroscopy, ultraviolet/visible spectrometry (UV) and transmission electron microscopy (TEM). CLAN and AMS materials in the form of coatings incorporating with modified clay and silica on cold-rolled steel (CRS) were found to be much superior in corrosion protection over those of pristine polyaniline based on a sequence of electrochemical measurements including corrosion potential, polarization resistance, corrosion current, and impedance spectroscopy in 5 wt % aqueous NaCl electrolyte at different operational temperature. Effect of the material composition on the gas permeability, water wettability , vapor permeability and optical clarity was inrestigated by gas permeability analyzer (GPA), contact angle measurement, vapor permeability analyzer (VPA), and UV-visible spectroscopy, respectively. In conclusion were found that the CLAN nanocomposites show better anticorrosion performance and lower gas permeability than neat PANI and AMS nanocomposite.