- 學位論文
電活性聚氨酯彈性體的合成與防腐蝕之性質研究
Synthesis and Anticorrosion Application of Polyurethane Elastomer Coatings
摘要
本研究將具有電活性的苯胺三聚體（ACAT）導入聚氨酯中，成功的製備出高機械強度的電活性聚氨酯彈性體，並且有效的應用在防腐蝕中。 首先利用苯胺與4,4'-二氨基二苯胺(para-phenylenediamine)合成出苯胺三聚體，以傅立葉轉換紅外線光譜儀（FTIR）、核磁共振儀（1H-NMR）和電噴霧離子源時間飛行質譜儀（ESI-TOF Mass）進行結構鑑定與分析，再以循環伏特安培儀（CV）驗證ACAT具有氧化還原的能力。 聚氨酯預聚體是利用異佛爾酮二異氰酸酯（IPDI）與聚醚二元醇（PTMG）進行反應。接著將聚氨酯預聚體與ACAT共聚合製備出具電活性聚氨酯彈性體（EPU）；而聚氨酯預聚體與異佛爾酮二胺（IPDA）共聚合製備出非電活性聚氨酯彈性體（NEPU）。 利用傅立葉轉換紅外線光譜儀（FTIR）、紫外光光譜儀（UV-Vis）、熱重分析儀（TGA）、萬用拉力試驗機、氣體透過分析儀（GPA）對材料進行物性測試，最後利用循環伏特安培儀（CV）進行電化學防腐蝕測試。 在電化學防腐蝕測試中，可發現EPU比NEPU更具有優異的防腐蝕能力。因為EPU鏈段中含有可氧化還原能力的ACAT，可在冷軋鋼上產生鈍性氧化層（Fe2O3、Fe3O4）形成保護層。本研究利用掃描式電子顯微鏡（SEM）與化學分析電子分析儀（ESCA）證明鈍性氧化層的存在。
並列摘要
The successful preparation of high mechanical property electroactive polyurethane elastomer (EPU) containing amine-capped aniline trimer (ACAT) is presented for the first time. To accomplish this, ACAT was synthesized by carrying out oxidative coupling reactions between aniline and para-phenylenediamine, After which it was characterized through Fourier-transformation infrared (FTIR), electrospray ionization time-of-flight mass spetra (ESI-TOF Mass) and Nuclear Magnetic Resonance spectromter (NMR). Finally, the redox behavior of ACAT was further analyzed by cyclic voltammetric (CV). Subsequently, a polyurethane (PU) prepolymer was prepared by polymerizing diisocyanate of isophorone diisocyanate and diol of polyether. Electroactive polyurethane elastomer (EPU) was then produced by allowing the as-prepared polyurethane prepolymer to react with ACAT under suitable conditions. Non-electroactive polyurethane (NEPU) was also prepared polyurethane prepolymer to react with isophorondiamine (IPDA). The physical properties of materials were characterized and analyzed by FTIR, UV-Vis, TGA, Tensile testing machine, Gas Permeability Analyzer (GPA). Finally, testing electrochemical corrosion measurements by Cyclic voltammetry (CV). Based on electrochemical corrosion measurements, EPU in the form of a elastomer was found to possess a clearly enhanced corrosion protection effect when compared to NEPU. The observed enhancement of the anticorrosion effect of EPU on a metallic substrate when compared to that of NEPU may have been caused by the redox catalytic capability of ACAT present in EPU, inducing the formation of a densely passive metal oxide layer (i.e., Fe2O3 and Fe3O4 ), as indicated by the results of scanning electron microscopy (SEM) and electron spectroscopy for chemical analysis.