共缩聚含芴聚酰亚胺的合成及性能研究

Synthesis and characterization of polyimides containing fluorene group by copolycondensation

利用2,7-二氨基芴（DAF）、4,4′-二氨基二苯醚（ODA）和2,2-双[4-（3,4-二羧基苯氧基）苯基]丙烷二酐（BPADA）,采用两步法通过共缩聚得到一系列不同结构的聚酰亚胺（PI）。通过FT-IR、TGA、DSC、XRD等测试方法对其性能进行了表征。结果表明,由于醚链、芴基的引入,共缩聚破坏分子链的规整性,所制得的PI皆具有较好的溶解性,在DMSO、NMP、DMF、DMAc中可溶解,4种PI的10%的失重温度为534.5-550.1℃,800℃下质量保持率为52.6%-59.8%,拉伸强度为95.2-104.8MPa,弹性模量为2.2-3.1GPa,表明材料具有优良的热稳定性且有较好的机械性能,作为耐热材料在精密仪器、微电子元件等方面有着潜在的应用价值。

A series of novel fluorene-based polyimides were synthesized by 2,7-diamine fluorene（2,7-DAF） ,4,4＇-diamino-diphenyl ether （ODA）, and 2,2-bis[4-（3,4-dicarboxyphenoxy） phenyl]-propane dianhydride （BPADA） through a two-step polycondensation. It was characterized by FT-IR,TGA,DSC, and UV-Vis. The polyimides showed good solubility in common used solvents such as DMSO,DMF, NMP, DMAc because of improved chain structure via introduction of flu- orene group. And they exhibited excellent thermal and thermo-oxidative stability with the onset decomposition temperature （Td） and 10% weight loss temperature （Td,10） of 534.5-540.1℃. The glass transition temperatures （Tg） of these poly- imides were in range of 198.9℃245.9℃ ,and the films showed high tensile strength of 95.2-104.8 MPa,tensile modulus of 2.2-3.1GPa. Such performance characteristics made it excellent potential in microelectro and fine apparatus.