1408323-87-4Relevant academic research and scientific papers
Synthesis and properties of new fluorinated polyimides derived from an unsymmetrical and noncoplanar diamine
Wang, Chenyi,Zhao, Xiaoyan,Li, Guang
, p. 2466 - 2472,7 (2012)
A new unsymmetrical and noncoplanar diamine containing trifluoromethyl and trimethyl groups, 1,4-bis(4-amino-2-trifluoromethylphenoxy)-2,3,5- trimethylbenzene (2), was synthesized using 2,3,5-trimethylhydroquinone and 2-chloro-5-nitrobenzotrifluoride as starting materials. A series of fluorinated poly(ether imide)s (PEIs) (4a-4d) were prepared from diamine 2 with four aromatic dianhydrides via a one-step high-temperature polycondensation procedure. The obtained PEIs were readily soluble in most organic solvents and could be solution-cast into flexible and strong films. The resulting thin films exhibited light color and good optical transparency with a cutoff wavelength of 356-376 nm. They also displayed good thermal stability with glass transition temperatures (Tg) above 281°C, 10% weight loss temperatures in the range of 482-486°C, and the weight residue more than 55% at 800°C in nitrogen. Moreover, they revealed low dielectric constants (2.77-2.93 at 1 MHz) and low moisture absorptions (0.41%-0.57%). A new unsymmetrical and noncoplanar aromatic diamine monomer has been successfully synthesized in high yield by a facile reaction route. New series of highly soluble fluorinated polyimides with moderate to high molecular weights have been prepared by a one-step polycondensation procedure. The resulting polyimides could be readily solution-cast into transparent and flexible films with light color, good optical transparency, moderate to high glass-transition temperatures, and low dielectric constants. The eminent combination of several properties guaranteed the obtained polyimides as potential high-temperature resistant materials for optical and photoelectric applications. Copyright
