本研究分別將軟質的聚乙烯醋酸乙烯酯(Ethylene Vinyl Acetate, EVA)高分子(rubbery polymer)與十二碳酸有機化水滑石(12AA-LDH)及二維三明治型態聚苯胺(Polyaniline, S-PANI)進行混摻製備高分子複合薄膜；另將聚醚碸(Polyether sulfone, PES)硬質高分子(glassy polymer)利用不同加工之方式製備高分子薄膜應用於氣體分離特性的量測。此高分子複合薄膜分別以FTIR、SEM及XRD分析12AA-LDH的插層效果與S-PANI的三層結構及其分散於高分子的型態，證實了12AA-LDH以剝離的狀態均勻的分散在水EVA高分子薄膜中，另S-PANI有明顯的三層二維片狀結構，同樣地均勻的分散在EVA高分子薄膜中。此二種高分子複合薄膜在CO2氣體分離測試結果顯示，12AA-LDH及S-PANI的添加有助於CO2氣體分離效果的改善。其中，當12AA-LDH添加量為1 wt%時，CO2/N2分離之選擇率由6.8提升至20.0，且達到約120 barrer之透過率；當添加S-PANI為3 wt%時，則可以將CO2/N2分離之選擇率提升至約32.5，氣體透過率可達97.5 barrer。另一方面，為解決PES氣體分離薄膜低透過率的特性，本研究利用乾式/濕式相反轉法(dry/wet phase inversion method)成功地製備出PES不對稱薄膜(asymmetric membrane)應用於氣體分離測試。PES不對稱膜對O2/N2之氣體選擇率為6.9，CO2/N2之氣體選擇率則有34.6，顯示本研究使用相反轉法所製備得不對稱薄膜在不經過修補情況之下(defect-free)便可以具有有效之氣體分離之結果。

Series of ethylene vinyl acetate (EVA) copolymer/layered double hydroxide (LDH) nanocomposite membranes (EVA/12AA–LDH) were prepared by solution blending and casting, and applied in membrane gas separation. The modification of LDH nanolayers (12AA-LDH) was manufactured by using 12-aminododecanoic acid (12AA) as an intercalation agent via co-precipitation method. The gas permeation performance of the EVA/12AA–LDH nanocomposite membranes was measured, and the results show that the best selectivity of CO2/N2 increased to 20 with a CO2 permeability of 119.21 Barrer for the composite membrane containing 1 wt% 12AA–LDH. The effect of the use of sandwich-like polyaniline (S-PANI) nanocomposites in CO2 gas separation membranes was also investigated. S-PANI were synthesized via a two-step dispersion polymerization method. The first step was to manufacture a leaf-like polyaniline (L-PANI), which was used in the next step as a 2D template to synthesize the S-PANI. The CO2/N2 separation performance of the EVA copolymer membrane was successfully enhanced by the addition of the S-PANI nanocomposite. The CO2/N2 selectivity of the membrane increased from 6.8 to 32.5 with a 3 wt% loading of S-PANI within the EVA matrix. Besides, a defect-free polyether sulfone (PES) asymmetric membrane was prepared by a one-step phase inversion process and applied gas separation process in this article. The morphology of the PES asymmetric membrane formed via phase inversion that was correlated with the solvent composition, evaporation environment, coagulation bath, etc. The selectivity of O2/N2 for membrane gas separation indicated that the asymmetric membranes prepared in this study were defect-free. The results of gas separation for the sponge-like PES membrane showed that the selectivity of O2/N2 and CO2/N2 was 7.1 and 35.6, respectively.

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