本研究成功合成Bicyclo[2.2.1]heptane-2-endo ,3-endo ,5-exo ,6-exo –tetracarboxylic 2,3:5,6-dianhydride [ BHDA(xn), Exo, Endo] 脂環族二酸酐。將此酸酐分別與芳香族二胺2,2'-Bis(trifluoromethyl)benzidine(TFMB)和4,4’-oxydianiline(ODA)合成半脂環族聚醯亞胺(semi-aromatic polyimide)。這些聚醯亞胺具有0.84~1.15 dL/g(0.5 g/dL, DMAc,35 oC)的固有黏度，有相當良好溶解度並能形成透明無色且具撓曲性的薄膜。以UV-visible光譜儀量測此薄膜，其截止波長範圍介於285~295 nm，波長400nm時穿透度85%以上。這些聚醯亞胺亦展現良好熱穩定性，其玻璃轉移溫度介於425~428之間，熱膨脹係數介於53~55μm/(m℃)之間，5%重量損失溫度介於503~516之間。此外，也展現極佳的機械強度，由拉力試驗得到拉伸強度49.9~50.9 MPa，楊氏係數1.2~1.7 GPa，拉伸率23.4~92.3 %。

In this study, alicylic anhydride bicyclo[2.2.1]heptane-2-endo ,3-endo ,5-exo ,6-exo –tetracarboxylic 2,3:5,6-dianhydride [ BHDA(xn), Exo, Endo] has been successfully synthesized. Novel polyimides PI-B-a and PI-B-b were prepared from this anhydride BHDA(xn)with various commercially available aromatic diamines.
These polyimides had inherent viscosities from 0.84 to 1.15 dLg-1 dL/g in DMAc at 35 oC, moreover, these polyimides can be solution-cast into transparent, colorless and flexible membranes. These films had the UV cut-off wavelengths in the range of 285~295 nm and the transmittance at wavelengths of 400 nm were over 85%.
All of the polyimides showed excellent thermal stability with no significant weight loss up to approximately 400 °C, and the 5% weight loss temperatures in N2 were over 500 °C. Their glass transition temperatures ranged from 425 to 428 ℃ and coefficient of thermal expansion were 53~54μm/(m℃)measured by thermomechanical analysis(TMA).The flexible polyimide films possessed a tensile strength range of 49.9~50.9 MPa, a tensile modulus range of 1.22~1.67 GPa, an elongation at break of 23.4~92.3 %.

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