As a high-performance material for preparing composite materials, polyimide fibers suffer from many potential drawbacks, including poor bonding with other substrates, which results in composite materials with poor mec...As a high-performance material for preparing composite materials, polyimide fibers suffer from many potential drawbacks, including poor bonding with other substrates, which results in composite materials with poor mechanical properties. Therefore, this study proposed a simple and rapid technique for obtaining loose, porous polyimide fiber papers by implementing a wet method using equal amounts of polyimide fiber and polyimide fiber paper as reinforcements, respectively. The polyimide resin-based composite materials were prepared by hand lay-up and hot pressing. The results showed that the paper-based reinforcement exhibited high porosity and the fibers were arranged with a uniform pore size distribution. The tensile properties, bending performance, and interlaminar shear performance of the paper-based composite improved by 130%, 108%, and 34.5%, respectively, compared to those of the fiberbased counterpart. The factors affecting the mechanical properties of the composites were analyzed based on the fiber length, fiber beating or lack thereof, and the basis weight of the paper. The increased uniformity of the polyimide fiber paper changed the ordering of the fibers and resolved drawbacks such as difficult dispersion, uneven pore size distribution, and poor mechanical properties related to single fibers in the resin-based composite material.展开更多
以聚酰亚胺短纤和沉析纤维为原料,通过湿法抄造结合热压和树脂浸渍的方法制备聚酰亚胺纤维/环氧树脂纸基复合材料,研究了热压温度、热压压力以及环氧树脂浸渍量对聚酰亚胺纸基复合材料性能的影响.结果表明,热压处理增加了聚酰亚胺纤维...以聚酰亚胺短纤和沉析纤维为原料,通过湿法抄造结合热压和树脂浸渍的方法制备聚酰亚胺纤维/环氧树脂纸基复合材料,研究了热压温度、热压压力以及环氧树脂浸渍量对聚酰亚胺纸基复合材料性能的影响.结果表明,热压处理增加了聚酰亚胺纤维间的接触面积,使聚酰亚胺纤维纸的力学性能和电学性能增强;采用环氧树脂浸渍处理,可以进一步增加聚酰亚胺纸基复合材料的力学性能(抗张指数提高了1.25倍)和电学性能(耐压强度提高了17%);当热压温度为210℃、热压压力为120 N/mm、浸渍量为20%时,所制备的聚酰亚胺纸基复合材料具有较好的力学性能和电学性能,其抗张指数为57.5 N·m/g,撕裂指数为6.86 m N·m2/g,耐压强度为12.3 k V/mm,在航空航天、绝缘阻隔、环境保护等领域具有潜在的应用前景.展开更多
基金financial support from the Lianyungang 555 Talents Project Program of China (2015-13)
文摘As a high-performance material for preparing composite materials, polyimide fibers suffer from many potential drawbacks, including poor bonding with other substrates, which results in composite materials with poor mechanical properties. Therefore, this study proposed a simple and rapid technique for obtaining loose, porous polyimide fiber papers by implementing a wet method using equal amounts of polyimide fiber and polyimide fiber paper as reinforcements, respectively. The polyimide resin-based composite materials were prepared by hand lay-up and hot pressing. The results showed that the paper-based reinforcement exhibited high porosity and the fibers were arranged with a uniform pore size distribution. The tensile properties, bending performance, and interlaminar shear performance of the paper-based composite improved by 130%, 108%, and 34.5%, respectively, compared to those of the fiberbased counterpart. The factors affecting the mechanical properties of the composites were analyzed based on the fiber length, fiber beating or lack thereof, and the basis weight of the paper. The increased uniformity of the polyimide fiber paper changed the ordering of the fibers and resolved drawbacks such as difficult dispersion, uneven pore size distribution, and poor mechanical properties related to single fibers in the resin-based composite material.
文摘以聚酰亚胺短纤和沉析纤维为原料,通过湿法抄造结合热压和树脂浸渍的方法制备聚酰亚胺纤维/环氧树脂纸基复合材料,研究了热压温度、热压压力以及环氧树脂浸渍量对聚酰亚胺纸基复合材料性能的影响.结果表明,热压处理增加了聚酰亚胺纤维间的接触面积,使聚酰亚胺纤维纸的力学性能和电学性能增强;采用环氧树脂浸渍处理,可以进一步增加聚酰亚胺纸基复合材料的力学性能(抗张指数提高了1.25倍)和电学性能(耐压强度提高了17%);当热压温度为210℃、热压压力为120 N/mm、浸渍量为20%时,所制备的聚酰亚胺纸基复合材料具有较好的力学性能和电学性能,其抗张指数为57.5 N·m/g,撕裂指数为6.86 m N·m2/g,耐压强度为12.3 k V/mm,在航空航天、绝缘阻隔、环境保护等领域具有潜在的应用前景.
