Synthesis of Novel Hyperbranched Polyimides from 2,6,12-Triaminotriptycene
The monomer 2,6,12-triaminotriptycene (TATP) was readily synthesized from triptycene by nitration reaction and separation on silica gel, followed by reduction by Pd/C and hydrazine in ethanol. By A2+B3 method for hyperbranched polyimide (HPIs) reported by Fang, reaction of 2,2-bis 4-(3,4-dicarboxyphenoxy) phenyl propane dianhydride (BPADA) with TATP in adverse monomer addition order, with different monomer ratios and various terminal modifiers, two serials of HPI with triptycene structure were produced without gelation. In the preparation of HPIs, slow addition rate (5 mL/h) and intense stirring were employed to keep lowest local concentration in reaction system. As shown in Scheme 1, during poly (amic acid) stage, different reagents were introduced to react with terminal anhydride or amino of hyperbranched poly(amie acid)s, followed by imidization to get polyimides with designed terminal groups.
Zhen Xu Lin Cheng Xingquan Xiong
Department of Materials Science & Engineering,Huaqiao University,Xiamen,Fujian 361021,China
国际会议
5th International Symposium on High-Tech Polymer Materials(HTPM-V)(第五届国际高技术高分子材料学术会议)
北京
英文
41-42
2008-10-27（万方平台首次上网日期，不代表论文的发表时间）