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- W2893045461 abstract "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 CF 3 ‐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 CF 3 ‐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 ( λ 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°C, coupled with the temperatures of 5% weight loss ( T 5% ) exceeding 500°C. It is also found that 3a and 4a exhibit contact angles against water beyond 110° and water absorptions below 0.8% together with dielectric constants less than 3.2." @default.
- W2893045461 created "2018-10-05" @default.
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- W2893045461 date "2018-09-27" @default.
- W2893045461 modified "2023-09-26" @default.
- W2893045461 title "Synthesis and optical properties of novel soluble and optically transparent semifluorinated poly (ether imide)s" @default.
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- W2893045461 doi "https://doi.org/10.1002/pat.4450" @default.
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