本研究利用4,4’-oxydianiline (4,4’-ODA)為起始物合成三種新型二胺，2,2’-diiodo-4,4’-oxydianiline (DI-ODA 3)、2,8-diaminodibenzofuran (DB-ODA 5)及2,2’-bis[p-(trifluoromethyl)phenyl]-4,4’-oxydianiline(BF-ODA 7)。分別與六種二酸以直接縮合聚合法合成新型的芳香族聚醯胺PA8a~8f、PA9a~9f及PA10a~10f。這些聚醯胺的固有黏度(Inherent viscosity)為 0.27~0.59 dL/g (0.5dL/g, NMP, 30℃)。由這三種二胺分別與4,4’-oxydibenzoic acid (OBA)、4,4’-sulfonyldibenzoic acid (SBA)及2,2-bis(4-carboxyphenyl)hexafluoropropane (6FA)所形成的聚醯胺，在濃度為20mg/mL時，皆可在室溫下溶於一般的有機溶劑，諸如DMAc、DMSO及NMP。其中聚醯胺PA10e及PA10d在室溫下亦可溶於Acetone、THF、DMF、DMAc、DMSO、m-Cresol及NMP，展現出良好的溶解度。這是因為在2,2’位置的巨大取代基三氟甲基苯，使高分子鏈堆疊不易所造成。這些聚醯胺亦展現出良好的熱穩定性，其玻璃轉移溫度(使用DSC測得)皆介於243~354℃之間；當使用相同二酸時，其玻璃轉移溫度為PA9系列＞PA8系列＞PA10系列。這些聚醯胺的5%熱重損失溫度Td5%(使用TGA測得)介於350~533℃之間，且PA9系列因為含有雜環且具平面結構，故熱裂解溫度比PA8及PA10系列都來的高，而PA8系列因為含有較弱的碳-碘鍵，其熱裂解溫度在聚醯胺系列之間為最低。以UV-visible光譜儀對聚醯胺的薄膜(厚度5~10 μm)進行量測穿透度，其截止波長(λcutoff)介於333~381 nm之間，而穿透度80%介於379~578 nm之間，顯示出聚醯胺具有淺色及良好的透光性。這些聚醯胺展現極佳的機械強度，由拉力試驗測得拉伸強度為21~88 MPa，伸長量為7~17 %，彈性模數為0.2~2.9 GPa。

Three aromatic diamines 2,2’-diiodo-4,4’-oxydianiline (DI-ODA 3), 2,8-diamino dibenzofuran (DADBF 5) and 2,2’-[bis(p-trifluoromethyl)phenyl]-4,4’-oxidianiline (BP-ODA 7) were synthesized by using 4,4’-oxydianiline (4,4’-ODA) as a starting material. Novel polyamides PA8a~f, PA9a~f, PA10a~f were prepared by the direct polycondensation of three diamines with various commercially available aromatic dicarboxylic acids. Inherent viscosities of the polyamides were in the range of 0.27-0.89 dL/g in N-methyl-2-pyrrolidinone (NMP) or concentrated sulfuric acid at 30 oC. The introduction of ether linkages and pendant groups (iodine and p-trifluoromethyphenyl) into polyamides led to an enhanced solubility in organic solvents such as N,N-dimethylformamide (DMF), N,N-dimethylacetamide (DMAc), N,N-dimethylsulfoxide (DMSO) and NMP at room temperature or upon heating. Especially, polyamides 8a, 8b, 10a and 10b containing rigid p-phenylene and m-phenylene structures can be soluble in DMF, DMAc, DMSO, NMP and m-cresol at room temperature. The polyamides could be solution-cast into transparent films from their N,N-dimethylacetamide solution. These films had the UV onset wavelengths in the range of 333-381 nm and wave-lengths at 80% transmission of 379-578 nm, indicating high optical transparency. Wide angle X-ray diffraction patterns indicated that the polymers were essentially amorphous in nature. The glass transition temperature observed for the polyamides were in the range of 243-354 oC. The temperature at 5% weight loss (Td5%), determined by TGA in nitrogen atmosphere, were in the range of 350-533 oC, indicating their good thermal stability. Due to the weak carbon-iodine bond, polyamide 8 containing iodine substituents decomposed at lower temperatures then polyamides 9 and 10. High optical transparency combined with excellent solubility and high thermal stability makes these polyamides potential candidates for soft electronic applications.

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