【摘要】 以对氨基苯氧基封端的聚四氢呋喃醚(p-APTMEG 1 000、p-APTMEG 2 000)和均苯四甲酸酐(PMDA)为原料二步法制备了聚醚酰亚胺(PEI)热塑性弹性体.聚醚酰胺酸(PEA)的亚胺化在120℃3 h即可完成.DMA和DSC数据表明PEI具有两相结构,软、硬相具有良好的相分离,其橡胶平台宽,在-20~180℃范围,且模量随着软段分子量的增加而降低.TGA结果表明PEI具有优异的热稳定性,初始热分解温度(Tdi)高于420℃,且热降解温域窄.应力应变表明PEI具有优异的力学性能.更多还原

【Abstract】 A series of poly(ether-imide)s were synthesized based on p-aminophenoxy-terminated poly(tetramethylene oxide) glycol(p-APTMEG) and PMDA by two-step reaction.FTIR and DSC were used to monitor the imidization of polyether amic acid(PEA) at different heat treatment stages.The results showed that the imidization of APTMEG soft segmented poly(ether amic acid)(PEA)processed much faster as compared with the conventional rigid aromatic polyamic aicd(PAA).The former could be comleted at 120℃,while the latter needs 200℃ at least.DMA,DSC and TGA were also used to study the phase structures and thermal properties of PEIs.The results indicated that the block copolymer had two well-separated phases(one is for PTMEG soft segment and the other is for imide hard segment) and exhibited a broad rubbery plateau of-20~180 ℃,which varied with hard-segment contents.Moreover,PEIs possessed excellent heat resistance with an initial thermal degradation weight-loss temperature of more than 420 ℃,owing to their stable backbones,which are almost composed of carbon-carbon,carbon-oxygen,benzene ring and imide structure.In addition,the excellent tensile properties of PEIs suggested that they could be potentially used as heat-resistant thermoplastic elastomers in the future.更多还原