基于N,N均苯四酸二酰亚撑-双2羧基乙基二酸的聚醚酯热塑性弹性体的性能研究

Synthesis and Characterization of New Thermoplastic Poly( ester-ether-imide) Elastomers Derived from N,N-bis( 2-carboxyethyl)-Pyromellitimide Unit with Excellent Thermal Stability

以均苯四甲酸二酐(PMDA)与氨基乙酸(GLY)为反应原料,N-甲基吡咯烷酮(NMP)为介质,合成了PMDA-GLY型酰亚胺二元酸单体,用该新型二元酸单体与聚四氢呋喃醚、1,4-丁二醇,采用二步法熔融缩聚,合成了一系列软/硬段比例不同的聚酯酰亚胺聚醚热塑性弹性体(PEIE),并采用元素分析、1HNMR、DSC、TGA、DMA对二元酸单体和该系列共聚物的化学组成、结构和性能进行表征,结果表明聚酯酰亚胺聚醚弹性体的特性粘数、熔点、热稳定和储能模量随着含有酰亚胺结构硬段比例的增加而增加,玻璃化转变温度随之降低,在低温下有较强的变形回复能力。

Three poly( ester-imide-ether)( PEIE) thermoplastic elastomers with different ratio of soft / hard segment were melt polymerized from 1,4-butanediol( BD) and polytetrahydrofuran diol( PTMG) and a bisimide dicarboxylic acid monomer based on pyromellitic dianhydride( PMDA) and glycine acid( GLY). The chemical structures and properties of polymers were characterized by elemental analysis,intrinsic viscosity,1HNMR,DSC,TGA and DMA. The results showed that the introduction of imide group endows the PEEIs with excellent thermal stability and the [η ],melting points,storage modulus( E') increase with the increase of the proportion of hard segment. While,the glass transition temperature( Tg) decreases. Meanwhile,elastic recovery properties of PEEIs are also improved in low temperature.