Synthesis of Novel Hyperbranched Polyimides from 2,6, 12-Triaminotriptycene
The monomer 2, 6, 12-triaminotriptycene (TATP)1 was readily synthesized from triptycene by nitration reactionand separation on silica gel, followed by reduction by Pd/C and hydrazine in ethanol. By A2+B3 method forhyperbranched polyimide (HPIs) reported by Fang2, reaction of 2, 2-bis 4-(3,4-dicarboxyphenoxy) phenylpropane dianhydride (BPADA) with TATP in adverse monomer addition order, with different monomer ratiosand various terminal modifiers, two serials of HPI with triptycene structure were produced without gelation. Inthe preparation of HPIs, slow addition rate (5 mL/h) and intense stirring were employed to keep lowest localconcentration in reaction system. As shown in Scheme 1, during poly (amic acid) stage, different reagents wereintroduced to react with terminal anhydride or amino of hyperbranched poly(amic acid)s, followed byimidization to get polyimides with designed terminal groups.
Zhen Xu Lin Cheng Xingquan Xiong
Department of Materials Science,Huaqiao University,Xiamen,Fujian 361021,China Department of Engineering,Huaqiao University,Xiamen,Fujian 361021,China Department of Materials Science & Engineering,Huaqiao University,Xiamen,Fujian 361021,China
国际会议
5th East-Asian Polymer Conference(第5届东亚高分子学术研讨会)
上海
英文
24-25
2008-06-03（万方平台首次上网日期，不代表论文的发表时间）