Syntheses of Colorless and Transparent Copolyimides and Comparison of the Properties of Their Copolyimides

Abstract

초록: 4,4'-Biphthalic anhydride(BPA)와 2,2'-bis(trifluoromethyl) benzidine(TFB)의 구조에 서로 다른 무수물인 4,4'-(hexafluoroisopropylidene) diphthalic anhydride(6FDA)와 1,2,4,5-benzentetra carboxylic dianhydride(pyromellitic dianhydride) (PMDA)를 각각 반응시켜 열적 및 화학적 이미드화 반응을 통해 두 가지 시리즈의 폴리이미드 공중합 체(copolyimide, Co-PI)를 합성하였다. 합성한 Co-PI를 각각 다른 두 가지 무수물 단량체의 조성에 따라 열적 성질 및 광학적 투명성을 서로 비교 분석하였다. 열적 성질을 증가시키기 위해서는 6FDA보다는 PMDA가 더 효과적이 었으나, 광학 투명성에서는 오히려 6FDA가 더 효과적이었다.Abstract: Two series of copolyimides (Co-PIs) were prepared by reacting 4,4'-(hexafluoroisopropylidene) diphthalic anhydride (6FDA) and 1,2,4,5-benzentetra carboxylic dianhydride (pyromellitic dianhydride) (PMDA), as dianhydrides based on 4,4'-biphthalic anhydride (BPA) and 2,2'-bis(trifluoromethyl)benzidine (TFB) by using thermal-and chemical imidizations. Co-PIs films with different dianhydride monomer compositions were compared in terms of their thermal properties and optical transparencies. The addition of PMDA was more effective than the addition of 6FDA for improving the thermal properties. Meanwhile, 6FDA is more effective in optical transparencies.

Effects of diamine isomers on the properties of colorless and transparent copoly(amide imide)s

“…Differential scanning calorimeter (DSC; NETZSCH 404 F3 Pegasus®), thermogravimetric analyzer (TGA; TA Q500), and thermomechanical analyzer (TMA-2940) were used in the same conditions as the previously published papers. 37,38 In particular, TMA was measured in the range of 30–230 °C. For the tensile properties of the film, a universal testing machine (UTM, Instron model 5564) was used, and the size of the film was 5 mm × 70 mm.…”