Chemical grafting of nano-TiO2 onto carbon fiber via thiol–ene click chemistry and its effect on the interfacial and mechanical properties of carbon fiber/epoxy composites
Chemical grafting of nano-TiO2 onto carbon fiber via thiol–ene click chemistry and its effect on the interfacial and mechanical properties of carbon fiber/epoxy composites
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DOI：
10.1007/s10853-017-1739-5
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发表时间：
2018-02
影响因子：
4.5
通讯作者：
L. Xiong;Feng Zhan;Hongbo Liang;Liang Chen;Daosong Lan
中科院分区：
文献类型：
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作者：
L. Xiong;Feng Zhan;Hongbo Liang;Liang Chen;Daosong Lan
碳纤维（CF）增强聚合物复合材料中的界面在决定复合材料的机械性能方面起着重要作用。为了提高碳纤维和树脂基体之间的界面粘合力，我们提出了一种在紫外线照射下通过硫醇-烯点击化学将纳米二氧化钛（nano-TiO2）接枝到CF表面的简便快速的方法。实验结果表明CF和纳米TiO2之间形成了化学键。纳米TiO2的引入显着增强了纤维的表面能，增加了纤维与树脂之间的润湿性和机械联锁，从而导致复合材料的界面性能显着提高。与原始CF/环氧树脂复合材料相比，用纳米TiO2接枝CF增强的复合材料的界面剪切强度提高了78%。此外，力学性能测试结果表明，接枝纳米TiO2后复合材料的弯曲强度和拉伸强度分别提高了32.3%和39.6%。
The interface in carbon fiber (CF)-reinforced polymer composites plays an important role in determining the mechanical properties of composites. In order to improve the interfacial adhesion between the carbon fiber and resin matrix, we presented a facile and rapid method for grafting nano-sized titanium dioxide (nano-TiO2) onto the CF surface by means of thiol–ene click chemistry under UV irradiation. Experimental results demonstrate that the chemical bonds are formed between the CF and nano-TiO2. The introduction of nano-TiO2significantly enhances the surface energy of fiber and increases the wettability and mechanical interlocking between fiber and resin, resulting in a significant increase in the interfacial properties of composites. Compared to the raw CF/epoxy composites, the composites reinforced by the CF grafted with nano-TiO2show an improvement of 78% in the interfacial shear strength. Moreover, the results of the mechanical properties tests reveal that the flexural strength and tensile strength of composites increase by 32.3 and 39.6% after grafting with nano-TiO2.