In order to prepare thermoplastic polyimide (PI) resins with good comprehensive performances, the modification of thermoplastic polyetherimides (PEIs) by 1,4-bis(2,3-dicarboxyphenoxy)-2--butylbenzene dianhydride (3,3′-TBHQDA) was systematically investigated. The PEI-a-x and PEI-b-x series of polyetherimides were synthesized by chemical imidization of the diamine monomer -phenylenediamine (-PDA) with different contents of 1,4-bis(3,4-dicarboxyphenoxy)-2--butylbenzene dianhydride (4,4′-TBHQDA) and 3,3′-TBHQDA or 4,4′-(4,4′-isopropylidenediphenoxy) bis(phthalic anhydride) (4,4′-BPADA) and 3,3′-TBHQDA. These PEIs had glass transition temperatures (s) in the range of 217–264 °C, low melt viscosities of 79–2367 Pa s, good transmittances of 87–88 % at 450 nm, and displayed good mechanical properties with tensile modulus of 2.8–3.2 GPa, tensile strengths of 89.6–118.4 MPa, and elongations at break of 3.9–6.4 %. The introduction of 3,3′-TBHQDA successfully improved thermal properties and melt processability of the PEIs. Among them, and displayed better comprehensive performances in PEI-a-x and PEI-b-x series, respectively, with moderate s (256 and 249 °C, respectively), extremely low melt viscosities (161 and 297 Pa s at 400 °C, respectively), high transmittances at 450 nm (87 %), and good mechanical properties (tensile modulus of 3.1 and 2.8 GPa, tensile strengths of 105.6 and 106.3 MPa, respectively).

中文翻译：

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1,4-双(2,3-二羧基苯氧基)-2-叔丁基苯二酐(3,3'-TBHQDA)改性热塑性聚醚酰亚胺树脂的合成及性能

为了制备综合性能良好的热塑性聚酰亚胺(PI)树脂，采用1,4-双(2,3-二羧基苯氧基)-2-丁基苯二酐(3,3′-TBHQDA)对热塑性聚醚酰亚胺(PEI)进行改性。进行了系统的调查。以不同含量的1,4-双(3,4-二羧基苯氧基)-2-丁基苯二酐(4 ,4'-TBHQDA)和3,3'-TBHQDA或4,4'-(4,4'-异亚丙基二苯氧基)双(邻苯二甲酸酐)(4,4'-BPADA)和3,3'-TBHQDA。这些 PEIs 的玻璃化转变温度 (s) 在 217–264 °C 范围内，熔体粘度为 79–2367 Pa·s，450 nm 处的透光率为 87–88%，并表现出良好的机械性能，拉伸模量为 2.8 –3.2 GPa，拉伸强度为 89.6–118.4 MPa，断裂伸长率为 3.9–6.4%。 3,3'-TBHQDA的引入成功改善了PEI的热性能和熔融加工性能。其中，PEI-ax和PEI-bx系列分别表现出更好的综合性能，具有适中的s（分别为256和249℃）、极低的熔体粘度（400℃时分别为161和297Pa·s） 、450 nm 处的高透过率 (87%) 和良好的机械性能（拉伸模量分别为 3.1 和 2.8 GPa，拉伸强度分别为 105.6 和 106.3 MPa）。