Toughened carbon fibre-reinforced polymer composites with nanoparticle-modified epoxy matrices
Toughened carbon fibre-reinforced polymer composites with nanoparticle-modified epoxy matrices
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DOI：
10.1007/s10853-016-0468-5
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发表时间：
2017-02-01
影响因子：
4.5
通讯作者：
Taylor, A. C.
中科院分区：
文献类型：
--
作者：
Carolan, D.;Ivankovic, A.;Taylor, A. C.
在当前的工作中，研究了基于酸酐固化环氧树脂（用活性稀释剂配制）基质并含有二氧化硅纳米颗粒和/或聚硅氧烷核壳橡胶（CSR）纳米颗粒的碳纤维增强聚合物（CFRP）复合材料的微观结构和断裂性能。进行双悬臂梁试验以确定CFRP复合材料的层间断裂能，同时采用单边缺口弯曲试样来评估本体聚合物的断裂能。添加 16 wt% 的 CSR 纳米粒子后，本体环氧聚合物的断裂能从未改性聚合物的 173 J/m(2) 增加到最大值 1237 J/m(2)。增韧机制被确定为 (a) 局部塑性剪切屈服和 (b) CSR 颗粒的空化，随后是基体的塑性空洞生长。 CFRP复合材料层间断裂能的稳态传播值随着纳米粒子浓度的增加而增加，从未改性环氧树脂基体的1246 J/m(2)增加到含有4 wt%二氧化硅纳米粒子和8 wt% CSR纳米粒子时的最大值1851 J/m(2)。 CFRP 复合材料中的裂纹扩展主要由纤维桥接增韧机制主导。考虑了韧性从本体聚合物转移到碳纤维复合材料的效率。与室温（即20℃）相比，在-80℃的测试温度下测得的本体材料和复合材料的断裂能均有所下降。然而，与未改性的环氧聚合物相比，二氧化硅和CSR纳米粒子对本体环氧聚合物和CFRP复合材料的增韧作用即使在较低温度下仍然很明显。事实上，二氧化硅纳米颗粒的增韧效果在 -80 A 摄氏度下比在室温下更大。
In the current work, the microstructure and fracture performance of carbon fibre-reinforced polymer (CFRP) composites based upon matrices of an anhydride-cured epoxy resin (formulated with a reactive diluent), and containing silica nanoparticles and/or polysiloxane core-shell rubber (CSR) nanoparticles, were investigated. Double cantilever beam tests were performed in order to determine the interlaminar fracture energy of the CFRP composites, while the single-edge-notched bend specimen was employed to evaluate the fracture energy of the bulk polymers. The fracture energy of the bulk epoxy polymers increased from 173 J/m(2) for the unmodified polymer to a maximum of 1237 J/m(2) with the addition of 16 wt% of CSR nanoparticles. The toughening mechanisms were identified as (a) localised plastic shear yielding and (b) cavitation of the CSR particles followed by plastic void growth of the matrix. The steady-state propagation value of the interlaminar fracture energy of the CFRP composites increased with increasing nanoparticle concentration, from 1246 J/m(2) for the unmodified epoxy matrix to a maximum of 1851 J/m(2) with 4 wt% of silica nanoparticles and 8 wt% of CSR nanoparticles. Crack growth in the CFRP composites was dominated by fibre-bridging toughening mechanisms. The efficiency of the transfer of toughness from the bulk polymers to the carbon fibre composites was considered. The measured fracture energy of both bulk and composite materials decreased at a test temperature of -80 A degrees C, compared with room temperature, i.e. 20 A degrees C. Nevertheless, the toughening effects of both the silica and CSR nanoparticles on the bulk epoxy polymers and the CFRP composites, compared with the unmodified epoxy polymers, were still evident even at the lower temperature. Indeed, the toughening effect of the silica nanoparticles was greater at -80 A degrees C than at room temperature.