本研究利用4,4’-Oxydianilin(4,4’-ODA)為起始物合成兩種新型二胺，2,2’-diiodo-4,4’-oxydianiline(DI-ODA 5)及2,2’ –Bisphenyl-4,4’-oxydianiline(BP-ODA 6)。將DI-ODA 5、BP-ODA 6分別與六種二酸酐以一步法合成新型的芳香族聚醯亞胺PI7a~7f及PI8a~8f。這些聚醯亞胺的固有黏度(inherent viscosity)為 0.41~1.89dL/g (0.5dL/g, NMP, 30℃)。由這兩種二胺分別與BTDA、ODPA、DSDA及6FDA所形成的聚醯亞胺，在濃度為20mg/mL時，都可在室溫下溶於一般的有機溶劑，諸如DMAc、DMSO及NMP。其中聚醯亞胺PI8a含有剛硬的Pyromellitic dianhydride(PMDA)，亦可溶於THF、DMF、DMAc、DMSO、NMP。這些聚醯亞胺比由4,4'- ODA合成的聚醯亞胺展現出更佳的溶解度。這可能是因為在2,2’位置的巨大碘和苯取代基，使高分子鏈節堆疊不易所造成。這些聚醯亞胺亦展現出良好的熱穩定性，其玻璃轉移溫度(使用DMA測得)皆介於271~328℃之間，當使用相同二酸酐為前提，PI7系列比PI8系列有較高的玻璃轉移溫度。這些聚醯亞胺的5%重量損失溫度Td 5%(使用TGA測得)介於429~591°C之間，而且PI7系列因為含有較弱的碳-碘鍵，其熱裂解溫度較PI8系列低。以UV-visible光譜儀對聚醯亞胺的薄膜(厚度5~10μm)進行量測穿透度，其截止波(λcutoff)介於318~381nm。穿透度80%的波長介於436~648nm。顯示出聚醯亞胺具有淺色和良好的透光性。這些聚醯亞胺展現極佳的機械強度，由拉力試驗測得拉伸強度為36~87 MPa，彈性模數為0.2~2.0 GPa，伸長量為6.8~18%。

Two new aromatic diamines, 2,2’-diiodo-4,4’-oxydianiline (DI-ODA 5) and 2,2’-bisphenyl-4,4’-oxydianiline (BP-ODA 6) were synthesized by using 4,4’-oxydianiline (4,4’-ODA) as a starting material. Novel polyimides 7a~f and 8a~f were prepared from these two diamines with various commercially available aromatic dianhydrides via a one-step high-temperature polycondensation procedure. These polyimides, containing flexible ether linkage and bulky iodide and phenyl substitutents, were highly soluble in common organic solvents such as dimethylacetamide (DMAc), dimethylsulfoxide (DMSO), N-methyl-2-pyrrolidinone (NMP) and m-cresol at room temperature. Polyimides 8a derived from BP-ODA 6 and rigid pyromellitic dianhydride (PMDA) was also soluble in tetrahydrand (THF), dimethylforamide (DMF), DMAc, DMSO and NMP. Compared with the polyimides prepared from 4,4’-ODA, these polyimides derived from the new diamines exhibited enhanced solubility. These polyimides had inherent viscosities from 0.41 to 1.89 dLg-1 in NMP or m-cresol at 30 °C. They can be cast from N,N-dimethylacetamide (DMAc) solutions to form transparent, flexible, and tough films. These films had the UV cut-off wavelengths in the range of 318-381 nm and the wavelengths of 80% transparency in the range of 436-648 nm. These polyimides had high glass transition temperatures in the range of 271-328 °C. They also exhibited good thermal stability, without any significant weight loss up to 400 ℃. The decomposition temperatures of these polyimides at 5% weight loss under nitrogen were in the ranges of 429-591 °C. Because of the weakness of the carbon-iodine bond, polyimides 7 containing iodide substituents decomposed at lower temperatures than polyimide 8. These polyimides also demonstrated outstanding mechanical properties with the tensile strength of 36-87 MPa, initial modulus of 0.9-2.2 GPa and elongation at breakage 6.8-18 %.

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