本研究利用戊二醛 (Glutaraldehyde，GA) 作為交聯劑，添加幾丁聚醣或螯合銀離子 (Ag+) 的幾丁聚醣 (Chitosan，CS) 至聚乙烯醇 (Polyvinylalcohol，PVA) 中，形成PVA/ GA/ CS或PVA/ GA/ CS-Ag+ 薄膜，進行異丙醇/水的分離效能探討。並使用X射線繞射儀 (X-ray diffraction，XRD)、傅立葉轉換紅外線光譜儀 (Fourier transform infrared spectroscopy，FTIR)、掃描式電子顯微鏡 (Scanning electron microscopy，SEM)、熱重力分析儀 (Thermogravimetric analysis，TGA) 、接觸角量測儀 (contact angle measurement)、電導度計 (Conductivity meter) 與抗拉強度測試儀 (tensile strength tests) 等儀器，測試對薄膜的結構與性質進行分析。
論文分為三大部份，第一部份主要是研究如何在不使用基材 (Substrate) 下製備出具有機械強度良好及對水穩定性高的薄膜，除了釐清製程中的參數變化對薄膜的影響外，並使用滲透蒸發測試 (Pervaperation test，PV) 來觀察薄膜對異丙醇和水的分離效能。一般而言，有機溶劑/水混合溶液中有機溶劑的比例越高，其通量越低，為克服這個問題，本論文第二部份以90%的異丙醇水溶液濃度進行滲透蒸發實驗，測試薄膜對此高濃度有機溶液的分離效果。第三部份為以CS對不同濃度的Ag+進行螯合，之後與PVA進行成膜，並調配不同比例的異丙醇/水溶液進行PV測試，探討Ag+的添加量對異丙醇/水溶液的分離效果。
結果可得知，以GA作為交聯劑，透過將已螯合Ag+ 之CS前驅體與PVA混合，可獲得具有高機械強度的PVA/ GA/ CS-Ag+ 薄膜。此PVA/ GA/ CS-Ag+ 薄膜應用於異丙醇/水溶液的滲透蒸發分離時，由於具高極性的銀離子的導入，可以有效地促進水的透過性，使得水的通量大為增加。由膨潤度、接觸角和導電度的量測可知薄膜的親水性因Ag+ 的添加有明顯的提升。此外銀離子以螯合形式存在於CS與PVA分子鏈間，使得分子間的孔洞較為均勻緻密，因此也不損失其選擇性。銀離子的添加對於高濃度異丙醇/水溶液體系的分離更顯重要性，本研究製得的PVA/ GA/ CS-Ag+ 薄膜，當Ag+含量為1.17×10-1 mol./ L，操作溫度為30℃時，通量可達1.97 kg / m2h，選擇因子可高達89991。以XRD與FTIR分析可得知薄膜中的確有銀離子的存在，且銀離子與CS和PVA間具有交互作用力，此亦為造成薄膜的機械強度大為提升的原因。

The Glutaraldehyde (GA) was used as a cross-linker in this study. Then the Chitosan (CS) or chitosan chelated with silver ion was added into the Polyvinylalcohol (PVA) to form the PVA/ GA/ CS and PVA/ GA/ CS-Ag+membrane respectively for the study of isopropanol/water mixture’s separation performance. The X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), Scanning electron microscopy (SEM), Thermogravimetric analysis (TGA), Contact angle measurement, Conductivity meter and tensile strength tests were utilized for the constructions and properties analysis.
This thesis is composed of three parts. In the first part, we attempt to prepare the membrane without substrate still possesses good mechanical property and water resistance. The effects of procedure parameters on the properties of membranes were evaluated. After that, the pervaporation separation performance of membranes for isopropanol-water mixture was appraised. In general, the permeation for higher organic solvent/water ratios behave the lower flux in pervaporation test. In order to solve this problem, the 90% isopropanol aqueous solution was adopted to measure the pervaporation separation performance as stated in the second part. In the third part, the various amount silver ions were chelated with CS via adding different concentration of Ag+ solution to CS. Subsequently, this Ag+-chelated CS was used as a precursor to prepare the PVA/ GA/ CS-Ag+ membrane by mixed with PVA. In addition, the various isopropanol/water mixtures were prepared for pervaporation separation effect assessment.
The results in this study were summarized as follows; the membranes with high mechanical property could obtained by mixing with the precursor of Ag+-chelated CS and PVA. The introduction of Ag+ with high polarity naturally could let water molecular easy to throughout the membranes. This mechanism may give rise to the large increase in permeation flux. This high hydrophilicity of PVA/GA/CS-Ag+ membranes could be determined by the measurements of swelling degree, contact angle and Electrical conductivity. The structure of membrane became uniform is due to the Ag+chelating with CS and PVA polymer chain. Thus, it promotes the membranes pervaporation flux without losing their selectivity. The application particularly showed its importance for the separation of water/isopropanol mixture under lower water percentage in feed. Based on the membrane prepared from the Ag+ concentration of 1.17x10-1 mol., the experimental result demonstrated that the highest flux of 1.97 kg/m2h accompanied with a separation factor up to ca. 9*104 could be achieved by the pervaporation separation of an isopropanol solution with the concentration of 90wt% at a given temperature of 30C. It also indicated clearly that the mixing system existed the chemical interaction or crosslink among Ag+, CS and PVA confirmed by the analyses of XRD and FTIR, resulting in the increase of mechanical property of the membrane.

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