Significant improved interfacial properties of PBO fibers composites by in-situ constructing rigid dendritic polymers on fiber surface
Significant improved interfacial properties of PBO fibers composites by in-situ constructing rigid dendritic polymers on fiber surface
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DOI：
10.1016/j.apsusc.2020.145719
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发表时间：
2020-05-15
影响因子：
6.7
通讯作者：
Wang, Li
中科院分区：
文献类型：
--
作者：
Liu, Zhide;Song, Bo;Wang, Li
本研究通过在PBO纤维表面构建刚性树枝状聚合物，显著提高了PBO纤维的界面性能。树枝状聚合物的刚性支化结构和大量官能团赋予界面更强的物理缠结和机械互锁、丰富的化学键合、改善的界面相容性和适中的力学性能。与未改性PBO纤维复合材料相比，改性PBO纤维复合材料的界面剪切强度和层间剪切强度分别提高了81.49%和42.17%。同时，由于刚性树枝状聚合物的构建，冲击强度从68.15 kJ/m（2）提高到103.28 kJ/m（2）。动态力学评估还表明，PBO-M2复合材料的储能模量（在30 ℃下）从34 +/- 2增加到47 +/- 3 GPa。此外，PBO-M2复合材料的耐湿热老化性能也得到了显著提高。
In this study, the interfacial properties of PBO fiber were enhanced significantly through constructing the rigid dendritic polymers on its surface. The rigid branched structure and massive functional groups of dendritic polymers endowed the interphase with more powerful physical entanglement and mechanical interlocking, abundant chemical bonding, improved interfacial compatibility and moderate mechanical properties. Compared with untreated PBO fiber composites, the interfacial shear strength and interlaminar shear strength of modified PBO fiber (PBO-M2) composites increased by 81.49 and 42.17%, respectively. Meanwhile, the impact strength raised from 68.15 to 103.28 kJ/m(2) due to the construction of rigid dendritic polymers. Dynamic mechanical evaluation also indicated that the storage modulus (at 30 degrees C) of PBO-M2 composites increased from 34 +/- 2 to 47 +/- 3 GPa. Moreover, the hydrothermal aging resistance of PBO-M2 composites was also markedly improved.