Effect of the introduction of carbon nanotubes on the thermal conductivity and mechanical properties of carbon fiber reinforced poly(phthalazinone ether sulfone ketone) composites.
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摘要: 碳纤维增强高性能热塑性树脂基复合材料的低导热性限制了其在散热领域的应用。本文采用溶液浸渍与热压相结合的方法制备了碳纳米管(CNTs)@碳纤维(CF)/聚芳醚砜酮(PPBESK)复合材料。通过热导率测定仪及万能试验机对其导热系数和力学性能进行了测定，采用光学显微镜、扫描电镜对复合材料断口形貌进行了表征，通过动态力学分析测定了复合材料的Tg和储能模量。结果表明：CNTs引入后，在复合材料中形成了导热网路，复合材料的导热系数提高到1.016 W/(m·K)，比纯CF/PPBESK复合材料提高了72%。同时复合材料的力学性能也明显改善，与纯CF/PPBESK复合材料相比，CNTs@CF/PPBESK复合材料的弯曲强度(
1695 MPa)、压缩强度(1001 MPa)、剪切强度(70 MPa)、拉伸强度(1696 MPa)分别提高了28%、37%、14%、17%。经测定，改性后的复合材料其Tg和储能模量也均有提高。Abstract: The low thermal conductivity of carbon fiber-reinforced high-performance thermoplastic resin matrix composites limited their application in heat dissipation. In this paper, carbon nanotubes (CNTs)@carbon fibers (CF)/poly(phthalazinone ether sulfone ketone) (PPBESK) composites were prepared by a combination of solution impregnation method and hot pressing. The thermal conductivity and mechanical properties were determined by thermal conductivity tester and universal testing machine, the fracture morphology of the composites was characterized by optical microscope and scanning electron microscope, and the Tg and energy storage modulus of the composites were determined by dynamic mechanical analysis. The results show that the introduction of CNTs formed a thermal conductivity network in the composites, and the thermal conductivity of the composites is increased to 1.016 W/(m·K), which is 72% higher than that of the pure CF-reinforced composites. Meanwhile, the mechanical properties of the composites are also significantly improved, and the flexural strength (1695 MPa), compressive strength (1001MPa),shear strength (70 MPa) and tensile strength of the CNTs@CF/PPBESK composites were increased by 28,37,14 and 17%, respectively, compared with those of the pure CF/PPBESK composites. The Tg and energy storage modulus of the modified composites are also determined to be improved. -
图 2 碳纳米管(CNTs)含量对导热性能的影响
Figure 2. Effect of carbon nanotubes (CNTs) content on thermal conductivity
图 4 纯碳纤维(CF)/聚芳醚砜酮(PPBESK)复合材料和CNTs@CF/PPBESK(4 wt％)复合材料在升温和降温过程中的红外热成像图
Figure 4. Infrared thermography of pure carbon fibers (CF)/poly(phthalazinone ether sulfone ketone) (PPBESK) composites and CNTs@CF/PPBESK (4 wt%) composites during ramp-up and ramp-down temperatures
图 5 CNTs@CF/PPBESK复合材料表面形貌图及纯CF/PPBESK复合材料与CNTs@CF/PPBSK复合材料热传导模拟图
Figure 5. Surface topography of CNTs@CF/PPBESK composites and heat conduction simulation of pure CF/PPBESK composites and CNTs@CF/PPBSK composites
图 6 CNTs含量对复合材料弯曲性能的影响
Figure 6. Effect of CNTs content on flexural properties of composites
图 7 弯曲端口的表面形貌(a) CF/PPBESK复合材料(b) CNTs@CF/PPBESK复合材料(c)图b红色圈标注图像放大图
Figure 7. Surface morphology of bending ports (a) CF/PPBESK composites (b) CNTs@CF/PPBESK composites (c) Fig. b Enlarged image labeled with red circle
图 9 失效压缩复合材料试样的光学显微照片。图(a)和(b)是CF/PPBESK复合材料;图(c)和(d)是CNTs@ CF/PPBESK(4 wt％)复合材料
Figure 9. Optical micrographs of failed compression composite specimens. (a) and (b) are CF/PPBESK composites; Figures (c) and (d) are CNTs@ CF/PPBESK (4 wt%) composites
图 11 SEM图：(a),(b)为纯CF/PPBESK复合材料，(c),(d)为CNTs@CF/PPBESK(4 wt％)复合材料
Figure 11. SEM images (a),(b) for pure CF/PPBESK composites, (c),(d) for CNTs@CF/PPBESK (4 wt%) composites
图 13 SEM图：(a)为纯CF/PPBESK复合材料，(b)为CNTs@CF/PPBESK(4 wt％)复合材料
Figure 13. SEM images: (a) for pure CF/PPBESK composites, (b) for CNTs@CF/PPBESK (4 wt%) composites
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