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Novel Non-Coplanar and Tertbutyl-Substituted Polyimides:Solubility,Optical,Thermal and Dielectric Properties

查看全文 作　　者：Chanjuan [1]Liu;Xianglin [1]Pei;Xiaohua [1]Huang;Chun [1]Wei;Xiaoyi [2]Sun 高影响力作者 机构地区：[1]Key Laboratory of New Processing Technology for Nonferrous Metal&Materials,Ministry of Education,and School of Material Science and Engineering,Guilin University of Technology,Guilin,Guangxi 541004,China;[2]College of Chemistry and Chemical Engineering,Central South University,Changsha,Hunan 410083,China高影响力机构 出　　处：《Chinese Journal of Chemistry》索引2015年第33卷第2期,共8页高影响力期刊 基　　金：supported by the National Natural Science Foundation of China(Nos.51163003,21264005 and 51263005);the fund of Guangxi Natural Science Foundation(Nos.2014GXNSFAA118040,2013GXNSFDA019008);Guangxi Small Highland Innovation Team of Talents in Colleges and Universities,and Fund。 摘　　要：A novel aromatic diamine monomer bearing tertbutyl and 4-tertbutylphenyl groups,3,3'-ditertbutyl-4,4'-diaminodiphenyl-4''-tertbutylphenylmethane(TADBP),was prepared and characterized.A series of non-coplanar polyimides(PIs)were synthesized via a conventional one-step polycondensation from TADBP and various aromatic dianhydrides including pyromellitic dianhydride(PMDA),3,3',4,4'-biphenyltetracarboxylic dianhydride(BPDA),4,4'-oxydiphthalic anhydride(OPDA),3,3',4,4'-benzophenone tetracarboxylic dianhydride(BTDA)and 4,4'-(hexafluoroisopropylidene)dipthalic anhydride(6FDA).All PIs exhibit excellent solubility in common organic solvents such as N,N-dimethylformamide(DMF),N,N-dimethylacetamide(DMAc),N-methyl-2-pyrrolidone(NMP),dimethyl sulfoxide(DMSO),chloroform(CHCl3),tetrahydrofuran(THF),and so on.Furthermore,the obtained transparent,strong and flexible polyimide films present good thermal stability and outstanding optical properties.Their glass transition temperatures(Tgs)are in the range of 298 to 347℃,and 10%weight loss temperatures are in excess of 490℃with more than 53%char yield at 800℃in nitrogen.All the polyimides can be cast into transparent and flexible films with tensile strength of 80.5-101 MPa,elongation at break of 8.4%-10.5%,and Young's modulus of 2.3-2.8 GPa.Meanwhile,the PIs show the cutoff wavelengths of 302-356 nm,as well as low moisture absorption(0.30%-0.55%)and low dielectric constant(2.78-3.12 at 1 MHz). 关 键 词：polyimides tertbutyl group SOLUBILITY dielectric constant
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