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以含均三嗪环结构的双氟单体2,4-二(4-氟苯基)-6-苯基-1,3,5-三嗪(BFPT)与4,4’-联苯二酚(BP)和9,9-二(4-羟基苯基)芴(BHF)为共聚单体,经溶液亲核取代逐步聚合,合成了一系列主链含三芳基均三嗪环结构和双苯基芴结构线性聚芳醚(PEPs).反应过程经优化,得到的聚合物数均分子量高达6.3×104.采用元素分析、FTIR、NMR和H-H gCOSY等对聚合物结构进行表征,并对聚合物进行溶解性、示差扫描量热(DSC)、动态力学性能(DMA)、热失重(TGA)、机械性能等测试.由于双苯基芴基团的存在,聚合物的溶解性得到明显改善.当双苯基芴结构单元含量高于20%时,聚合物可溶于N-甲基吡咯烷酮(NMP)、氯仿(CHCl3)、四氯乙烷(C2H2Cl4)、和吡啶(pyridine)等极性溶剂中,同时保持了优异的耐热性.聚合物的玻璃化转变温度Tg由DSC测得在269~307℃之间,由DMA测得在269~291℃之间,且随着主链中双苯基芴结构的增加而升高.N2气氛下,PEPs的5%热失重温度超过544℃,800℃残碳率大于48%.
The bis-fluorinated monomer 2,4-bis (4-fluorophenyl) -6-phenyl-1,3,5-triazine (BFPT) Phenol (BP) and 9,9-bis (4-hydroxyphenyl) fluorene (BHF) as comonomers were synthesized by stepwise nucleophilic substitution of the solution to synthesize a series of triaryl- Phenyl-fluorene linear polyarylene ethers (PEPs) were synthesized.The average number-average molecular weight of the obtained polymer was up to 6.3 × 104. The structure of the polymer was characterized by elemental analysis, FTIR, NMR and HH gCOSY, The polymers were tested for solubility, differential scanning calorimetry (DSC), dynamic mechanical properties (DMA), thermal weight loss (TGA), mechanical properties, etc. The solubility of the polymer was significantly improved by the presence of the bisphenylfluorene group. The polymer is soluble in polar solvents such as N-methylpyrrolidone (NMP), chloroform (CHCl3), tetrachloroethane (C2H2Cl4), and pyridine when the content of structural units of diphenylfluorene is more than 20% While maintaining excellent heat resistance.The glass transition temperature Tg of the polymer was between 269 and 307 ° C as measured by DSC and between 269 and 291 ° C as measured by DMA, Phenyl fluorene structure increased and increased .N2 gas Atmosphere, PEPs 5% weight loss temperature over 544 ℃, 800 ℃ residual carbon rate greater than 48%.