Synthesis and Characterization of Heat-resistant New Polyimides from Aliphatic Polycyclic Diamines and Pyromellitic Dianhydride

• Main Authors: Lin Ming-Chen, 林明城
• Other Authors: Chern Yaw-Terng
• Format: Others
• Language: zh-TW
• Published: 1993
• Online Access: http://ndltd.ncl.edu.tw/handle/10790392924701430854

碩士 === 國立臺灣科技大學 === 化學工程研究所 === 81 === We prepare 1,3-diaminoadamantane from nitration with high pressure reactor by hydrogen reduceation to 1,3-diaminoadamantane. On the other side, to prepare diamantane from norbonadiene with Lewis acid catalys- tation to rearrange to it. Then, by bromination to 1,6- dibromodiamantane and catalyst by sulfuric acid to get 1,6-diacetamidodiamantane, at lest, to hydrolysis 1,6- diacetamidodiamantane with NaOH to 1,6-diamino- diamantane. Polyamic acid was prepared from the aliphatic di- amine and pyromellitic dianhydride (PMDA) in dimethyl acetamide (DMAC) by solution polycondensation, another by interfacial polycondensation with diamine which is water- soluble and organic solvent-solube acylchloride. By heating treatment cause to cyclization to thermo- plastic polyimides. Another thermoseting polymers (PMR) was prepared from aliphatic diamine, diacid anhydride easter, and norbornene (NE or MA) in Methanol. The part of thermoplastic polyimides, which have no prominent adsorption in anhydride or isoimide. To support good thermal stability, the temperature of 5% weight loss be about 410-440℃ at last. It is about 50℃ lower compared with thermoplastic polyimides and with anhydride as the result of unpurification. The comparison of the aromatic-polyimides, thermo- plastic and thermosetting polyimides are both lower water-absorption than it, and thermosetting polyimides are particular. We can get the transition glass temperature (Tg) at 300℃ from DSC.