Synthesis and Properties of New Fluorinated Polyimides Derived from an Unsymmetrical and Noncoplanar Diamine  

作　　者：汪称意 赵晓燕 李光 

机构地区：[1]School of Material Science and Engineering,School of Petrochemical Engineering,Changzhou University,Changzhou,Jiangsu 213164,China [2]State Key Laboratory for Modifcation of Chemical Fibers and Polymer Materials,College of Material Science and Engineering,Donghua University,Shanghai 201620,China

出　　处：《Chinese Journal of Chemistry》2012年第10期2466-2472,共7页中国化学（英文版）

基　　金：This work was supported by the National Natural Science Foundation of China （No. 51103016）, the Natural Science Foundation of Jiangsu Province （No. BK2011232 and BK2011241）, the Grant-in-aid for Youth Innovation Fundation of Changzhou University （No. ZMFll020017 and ZMFl102037）, and the Open- ing Project of State Key Laboratory for Modification of Chemical Fibers and Polymer Materials （No. LK1001）.

摘　　要：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 wave- length of 356--376 nm. They also displayed good thermal stability with glass transition temperatures （Tg） above 281℃, 10% weight loss temperatures in the range of 482--486 ~C, and the weight residue more than 55% at 800℃ in nitrogen. Moreover, they revealed low dielectric constants （2.77-2.93 at 1 MHz） and low moisture absorp- tions （0.41%-0.57%）.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 wave- length of 356--376 nm. They also displayed good thermal stability with glass transition temperatures （Tg） above 281℃, 10% weight loss temperatures in the range of 482--486 ~C, and the weight residue more than 55% at 800℃ in nitrogen. Moreover, they revealed low dielectric constants （2.77-2.93 at 1 MHz） and low moisture absorp- tions （0.41%-0.57%）.

关 键 词：fluorinated polyimides SOLUBILITY optical transparency dielectric constant 

分 类 号：TQ226.31[化学工程—有机化工] O633.22[理学—高分子化学]