第一個商業用聚醯亞胺為杜邦公司所開發，其具有一定的機械性強、耐熱性、耐腐蝕性以及絕緣等良好物化性質，因此廣泛地被用於航空、化工、光電以及半導體等領域。 但其昂貴的價格，較差的可塑性以及透光性等缺點，所以難以被大量製造。近年來可彎曲式螢幕以及攜帶式裝置發展迅速，同時軟性透明薄膜基材需求大量增加，因此，此研究將朝向低成本及高軟性透及透明性聚醯亞胺的方向進行。
本研究開發出新的單體反式1,4-環己二胺(Trans-1,4- cyclohexanodiamine, trans-CHDA)的合成方法，合成與純化出純度99%的反式1,4-環己二胺 (總產率為37%)，並將反式1,4-環己二胺分別與三種二元酸酐經由兩步驟反應合成出六種聚醯亞胺薄膜 (Polyimide film, PI film)。透過合作廠商以業界標準分析方法鑑定PI薄膜物性 (厚度為25 um)，經由熱重分析儀、多功能光學檢測儀及拉伸儀測定，發現共聚合物PI5 [反式1,4-環己二胺+ 4,4'-（六氟異亞丙基）二鄰苯二甲酸酐 + 3,3',4,4'-聯苯四甲酸二酐] 與PI6[反式1,4-環己二胺 + 4,4'-（六氟異亞丙基）二鄰苯二甲酸酐 + 9,9-雙(3,4-二羧基苯基)芴二酐]具有高光穿透率 (88.25%； 89.22%)、高玻璃轉化溫度 (380.3 OC； 429.7 OC)、高抗拉強度 (24.0 kgf/mm2； 27.5 kgf/mm2) 以及低楊氏模數 (5391.51 Mpa； 5459.15 Mpa) 之聚醯亞胺薄膜具有優於商品 (Taimide OT-025)之PI薄膜。此開發之PI薄膜應用於配相膜、航空載具塗層、絕緣膠等多種應用，應具有一定的競爭力。

The first commercial polyimide was developed by DuPont, which shows good physicochemical properties such as strong mechanical properties, heat resistance, corrosion resistance, and insulation. It was used in aerospace, chemical, optoelectronic, and semiconductor fields; however it shows some disadvantages, such as high price, poor plasticity and light transmittance. In recent years, flexible screens and portable devices have been developed rapidly. At the same time, the demand for flexible transparent film substrates had greatly increased. Therefore, the development of low-cost and high-transparency polyimide has been becoming very important.
This study aims to develop a new synthetic process of Polyimide (PI) monomer, trans-1,4-cyclohexanediamine and with which to react with various dianhydride with less molecular interaction. Thus, to reduce the processing cost and improve its physicochemical properties. Both monomers, the modified diamine and various commercial available dianhydride with less molecular interactions, caused by the ionic-ionic and/or - stacking interaction, were used to synthesize the polyimides in this study. We have developed a synthetic and purifying method for preparing trans-1,4- cyclohexanodiamine ( trans-CHDA) with 99% purity and 37% overall yield, The purity is higher than that of commercial available trans-CHDA (95%). The diamine thus developed lack the ionic-ionic and/or - stacking interactions. The commercial available dianhydrides with more bulky functional groups or the Sp3 carbon bridge linking the two anhydrides moiety used in this study showed less intermolecular interaction also caused by the ionic-ionic and/or - stacking interactions. Therefore, trans-1,4-cyclohexanediamine and three dianhydrides were respectively reacted to synthesize six kinds of polyimide film (PI film) through a two-step reaction. The physical properties of PI film (thickness 25 um) were identified through the industry standard analysis method by a partner manufacturer, and measured by a thermogravimetric analyzer, a multi-function optical detector, and a tensile tester. It was found that PI5 polymerized from [trans-1,4-cyclohexanodiamine, + 3,3’,4,4’-biphenyltetracarboxylic dianhydride + 4, 4'-(Hexafluoroisopropylidene)diphthalic anhydride] and PI6 polymerized from [trans-1,4-cyclohexanodiamine + 9,9-Bis(3,4-dicarboxyphenyl)fluorene dianhydride + 4, 4'-(Hexafluoroisopropylidene)diphthalic anhydride] have high light transmittance (88.25%; 89.22). %), high glass transition temperature (380.3 OC; 429.7 OC), high tensile strength (24.0 kgf/mm2; 27.5 kgf/mm2) and low Young's modulus (5391.51 Mpa; 5459.15 Mpa) of polyimide film.
Based on the analysis of the PIs, it was found that the high purity diamine and the targeting commercial dianhydrides used in this studied are promising monomers to produce polyimides with high light transmittance, high glass transition temperature, high tensile strength, and low Young's modulus. These PIs show having a better physicochemical properties compared to the Pi currently used in industry. Therefore, these PIs developed in this study have the potential to be applied in a variety of applications, such as phase matching film, aviation vehicle coating, and insulating glue and so on. This study showed that a polyimide with more flexible and more transparency could obtained by modifying the structures of diamine and dianhydride with less molecular interaction. In a word, this study showed a way to develop good physicochemical properties of polyimide.

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