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通过分子设计,合成了含三氟甲基及硫醚基团的二胺单体4,4’-双(4-胺基-2-三氟甲基苯硫基)二苯硫醚(6FSEDA),利用其与6种芳香二酐单体:3,3’,4,4’-联苯四羧酸二酐(BPDA)、4,4’-氧双邻苯二甲酸酐(ODPA)、3,3’,4,4’-二苯酮四酸二酐(BTDA)、4,4’-(六氟异丙基)-苯二酸酐(6FDA)、3,3’,4,4’-二苯硫醚四酸二酐(DTDA)及3,3’,4,4’-二苯砜四酸二酐(DSDA)经一步法合成了一系列含氟及硫醚基团的聚酰亚胺(PI),并对其结构与性能进行了研究.结果表明,该系列PI的玻璃化温度Tg(DSC)在199.8～231.7℃范围,5%和10%热失重的温度(N2氛围)分别在491℃和517℃以上,在400～700 nm的可见光波长范围内具有优异的光学透明性,在光通讯波段(1310 nm和1550 nm处)均无明显吸收,且在这两个波长处测得的平均折射率范围分别为1.5401～1.6142和1.5389～1.6124,在波长632.8 nm测得的双折射范围为0.0012～0.0045.可见,含氟及硫醚基团聚酰亚胺薄膜具有良好的热稳定性和光学性能.
Through the molecular design, 4,4’-bis (4-amino-2-trifluoromethylphenylthio) diphenyl sulfide (6FSEDA), a diamine monomer containing trifluoromethyl and thioether groups, , With its use of six aromatic dianhydride monomers: 3,3 ’, 4,4’-biphenyl tetracarboxylic dianhydride (BPDA), 4,4’-oxydiphthalic anhydride (ODPA), 3 , 4,4 ’- (hexafluoroisopropyl) phthalic anhydride (6FDA), 3,3’, 4,4’- Diphenylsulfidetetracarboxylic dianhydride (DTDA) and 3,3 ’, 4,4’-diphenylsulfonetetracarboxylic dianhydride (DSDA) were synthesized by one-step synthesis of a series of fluorine- and thioether- The results showed that the glass transition temperature Tg (DSC) of this series of PI ranged from 199.8 to 231.7 ℃, and the 5% and 10% weight loss temperatures (N2 atmosphere) At 491 ° C and above 517 ° C, it has excellent optical transparency in the visible wavelength range of 400-700 nm and no significant absorption in the optical communication band (at 1310 nm and 1550 nm), and at these two wavelengths The average refractive index ranges from 1.5401 to 1.6142 and 1.5389 to 1.6124, respectively, and the birefringence at a wavelength of 632.8 nm ranges from 0.0012 to 0.0045. It can be seen that the polyimide thin films containing fluorine and sulfide groups Having good thermal stability and optical properties.