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首页> 外文期刊>Journal of Applied Polymer Science >Synthesis of Polyimides with Low Viscosity and Good Thermal Properties via Copolymerization
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Synthesis of Polyimides with Low Viscosity and Good Thermal Properties via Copolymerization

机译：通过共聚合成低粘度和良好热性能的聚酰亚胺

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摘要

Novel polyimides were successfully synthesized through copolymerization of diamine monomers p-phenylenediamine (p-PDA) and 4,4'-diaminodiphenylmethane (MDA) with different proportions and 2,3,3',4'-biphenyltetracarboxylic dianhydride (a-BPDA) using 4-phenylethynylphthalic anhydride (4-PEPA) as an end-capping agent. The melt rheological properties, thermal properties, and crystallinity of PI oligomers were investigated via rheometer, dynamic mechanical analysis (DMA), thermal gravimetric analysis (TGA), differential scanning calorimetry (DSC), and X-ray diffraction (XRD). The results indicate that melt viscosity and solubility of the PI oligomers were improved, but the glass transition temperature (T-g) and crystallinity decreased with the increasing molar ratio of MDA. PI oligomer 3 with the molar ratio of MDA/p-PDA=2/1 shows a lower minimum melt viscosity (66 Pa.s) at 313 degrees C and better solubility in aprotic solvents. The corresponding PI-3 exhibits a high glass transition temperature of 406 degrees C and excellent thermal stability. This copolyimide shows good processability and thermal properties, and could become a good candidate of matrix resins for high performance composites in aerospace field. (c) 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015, 132, 41303.
机译：通过使用不同比例的二胺单体对苯二胺（p-PDA）和4,4'-二氨基二苯甲烷（MDA）与2,3,3'，4'-联苯四甲酸二酐（a-BPDA）共聚成功合成了新型聚酰亚胺4-苯基乙炔基邻苯二甲酸酐（4-PEPA）作为封端剂。通过流变仪，动态力学分析（DMA），热重分析（TGA），差示扫描量热法（DSC）和X射线衍射（XRD）研究了PI低聚物的熔体流变性质，热性质和结晶度。结果表明，PI低聚物的熔体粘度和溶解度得到改善，但玻璃化转变温度（T-g）和结晶度随MDA摩尔比的增加而降低。具有MDA / p-PDA ＝ 2/1的摩尔比的PI低聚物3在313℃下具有较低的最低熔体粘度（66Pa.s），并且在非质子溶剂中具有更好的溶解性。相应的PI-3具有406摄氏度的高玻璃化转变温度和出色的热稳定性。该共聚酰亚胺显示出良好的加工性能和热性能，并且可以成为航空航天领域中高性能复合材料的基体树脂的良好选择。 （c）2014 Wiley Periodicals，Inc. J. Appl。 Polym。科学2015，132，41303。

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