【摘要】 合成了具有苯侧基的二胺单体1,4-双(4′-氨基苯氧基)-2-(苯基)苯(p-TPEQ),并与3,3′,4,4′-苯酮四羧酸二酐(BTDA)进行缩聚反应,分别以4-苯乙炔苯酐(PEPA)和4-苯乙炔-1,8-萘二甲酸酐(PENA)作为封端剂,合成了两个系列的苯乙炔封端的酰亚胺预聚体.DSC测试结果表明,此类预聚体具有比PETI-5更宽的加工窗口;利用所合成的预聚体制成了具有较高热分解温度热固性交联PI薄膜.结果表明,PI预聚体加工性能良好,其交联后具有优异的力学和热学性能;同时PEPA封端的预聚体树脂具有比PENA封端的树脂更为优异的综合性能.更多还原

【Abstract】 A diamine monomer\2,5-bis(4-aminophenoxy)biphenyl(p-TPEQ)was synthesized by four-step routes, and 4-(1-phenyl ethynyl)-1,8-naphthalic anhydride(PENA) was synthesized and characterized as well. Two series of phenylethynyl-terminated imide oligomers were prepared by reacting BTDA with p-TPEQ, and end-capped with 4-phenylethynylphthalic anhydride(PEPA) or PENA. The thermal curing processes of the oligomers were investigated by FTIR, differential scanning calorimetry. As a result of undergoing a complex reaction of the phenylethynyl in the heating run, T_g increased with the increase of content of phenylethynyl. The obtained imide oligomers were molded into films. The cured films exhibited excellent mechanical properties and thermo-oxidative stability. All the results indicate that the incorporation of p-TPEQ monomer can increase the solubility and processing ability of the oligomers.更多还原