화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Macromolecular Research, Vol.19, No.6, 528-536, June, 2011
DOI10.1007/s13233-011-0611-8  Export Citation
Novel Thermal Stable Organosoluble Polyamides and Polyimides Based on Quinoxalin Bulky Pendent Group
Mousa Ghaemy†, Roghieh Porazizollahy, and Maasoomeh Bazzar
  • Faculty of Chemistry, University of Mazandaran, Babolsar, 47416-95447, Iran, Korea
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A new diamine containing a bulky diphenylquinoxalin pendant, 3,5-diamino-N-(2,3-diphenylquinoxalin-7-yl)benzamide (DQB), was synthesized in four steps through the nucleophilic aromatic substitution of 3,5-dinitrobenzoylchloride with 2,3-diphenylquinoxalin-6-amine and subsequent catalytic reduction. All intermediates and DQB were fully characterized by FTIR, NMR and elemental analysis. A series of polyamides PA(a-e) was synthesized from this diamine by direct polycondensation with various dicarboxylic acids, triphenyl phosphate and pyridine in N-methyl-2-pyrrolidynone (NMP). Three polyimides PI(a-c) were synthesized from this diamine using commercial dianhydrides in two-step polycondensation. Characterization of polymers was accomplished by FTIR, H NMR, elemental analysis, DSC, DMTA, GPC, and TGA. The intrinsic viscosities of PAs ranged from 0.54 to 0.67 dL/g. PAs displayed Tg values of 140-298 ℃ and 10% weight loss of 415-485 ℃ in N2. The Tg values of the PIs varied between 200 and 310 ℃, with 10% weight loss above 500 ℃ in N2. The PAs were soluble in common polar aprotic solvents at room temperature whereas the aromatic PIs were dissolved by heating at 60 ℃.
Keywords:polycondensation;polyamides;polyimides;solubility;thermal properties.
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