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Synthesis and optical properties of novel soluble and optically transparent semifluorinated poly (ether imide)s

机译：新型可溶性和光学透明半氟化聚（醚Imide）的合成和光学性质

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摘要

A fluorinated diamine monomer containing flexible ether linkage and bulky trifluoromethyl substituents, namely, bis(4-amino-2-trifluoromethylphenyl) ether (a), is employed to react with nonfluorinated 1,4-bis(3,4-dicarboxyphenoxy) benzene dianhydride (3) and CF3-free 2,2-bis[4-(3,4-dicarboxyphenoxy)phenyl] propane dianhydride (4), respectively, to prepare 2 novel soluble and optically transparent semi-fluorinated poly (ether imide)s (PEIs; 3a and 4a). Compared with the corresponding PEIs based on nonfluorinated 4,4 '-diaminodiphenyl ether (b) and CF3-free pyromellitic dianhydride (5), the novel semifluorinated PEIs 3a and 4a not only display better solubility in some organic solvents and higher optical transparency with cutoff absorption wavelength (lambda(0)) below 370 nm but also maintain outstanding mechanical properties and thermal stability. 3a and 4a have tensile strength beyond 80 MPa and possess glass-transition temperatures (T-g) beyond 210 degrees C, coupled with the temperatures of 5% weight loss (T-5%) exceeding 500 degrees C. It is also found that 3a and 4a exhibit contact angles against water beyond 110 degrees and water absorptions below 0.8% together with dielectric constants less than 3.2.
机译：含有柔性醚键和庞大三氟甲基取代基的氟化二胺单体，即双（4-氨基-2-三氟甲基苯基）醚（a），用于与非氟化1,4-双（3,4-二羧苯氧基）苯二酐反应（3）和无CF3 2,2-双[4-（3,4-二羧氧基）苯基]丙烷二酐（4），分别制备2个新型可溶性和光学透明的半氟化聚（醚酰亚胺）S（ peis; 3a和4a）。与基于非氟化4,4'-二胺二庚烯醚（B）和CF3的致甲状腺二酐（5）的相应PeI相比，新型半氟化PEIS 3A和4A不仅在一些有机溶剂和较高的截止值中显示出更好的溶解度吸收波长（Lambda（0））低于370nm，但也保持出色的机械性能和热稳定性。图3A和4A的拉伸强度超过80MPa，并且具有超过210℃的玻璃转变温度（Tg），与超过500℃的5％重量损失（T-5％）的温度相结合。还发现3a和图4A将抵抗超过110度的接触角，水吸收低于0.8％，与介电常数小于3.2。

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