HETEROAROMATIC POLYMERS—HIGH TEMPERATURE POLYPYRROLONES DERIVED FROM 2,6-BIS(3',4'-DIAMINOPHENYL)-4-BIPHENYLPYRIDINE AND VARIOUS AROMATIC DIANHYDRIDES |
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作者姓名: | Hai-xia Yang Jin-gang Liu Xiao-juan Zhao Yan-feng Li Lin Fan and Shi-yong Yang a School of Chemistry and Chemical Engineering Lanzhou University Lanzhou China b Laboratory of Advanced Polymer Materials Institute of Chemistry Chinese Academy of Sciences Beijing China |
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作者单位: | Hai-xia Yang;Jin-gang Liu;Xiao-juan Zhao;Yan-feng Li;Lin Fan and Shi-yong Yang a School of Chemistry and Chemical Engineering,Lanzhou University,Lanzhou 730000,China b Laboratory of Advanced Polymer Materials,Institute of Chemistry,Chinese Academy of Sciences,Beijing 100080,China |
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基金项目: | This project was supported by the National Natural Science Foundation of China(No.50403025). |
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摘 要: | A new type of aromatic tetraamine containing biphenyl moiety in the side chain was synthesized via a modified Chichibabin's reaction.3-Nitro-4-acetamidoacetophenone was reacted with 4-phenyl benzaldehyde in the presence of ammonium acetate to obtain 2,6-bis(3',4'-diaminophenyl)-4-biphenyl pyridine(DPPA).A series of polypyrrolones(PPys) were prepared using tetraamine and various aromatic dianhydrides via a two-step cyclization procedure.All the PPys show excellent high temperature stabilities with the initial decomposition temperatures of 530-549℃ and residual weight ratio of 49%-80% at 750℃ in nitrogen.The polymers exhibit no apparent glass transition temperatures(T_gs)except PPy-1 (T_g=327℃),which is derived from tetraamine DPPA and 2,2-bis4-(3',4'-dicarboxyphenoxy)-phenyl]propane dianhydride (BPADA).In addition,the polymers have acceptable mechanical properties with the tensile strength of 65-94 MPa.The PPy films show excellent hydrolysis-resistance in alkaline aqueous medium and could maintain most of the properties even after boiling in 10% aqueous sodium hydroxide solution for a week.
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