期刊
POLYMER COMPOSITES
卷 43, 期 11, 页码 8483-8498出版社
WILEY
DOI: 10.1002/pc.27018
关键词
composites; interfaces; mechanical properties; nanoparticles
资金
- National Natural Science Foundation of China [U1809218, 52003281, U21A20165]
- Zhejiang Provincial Natural Science Foundation [LD22E050011, LY21E030012]
- Ningbo Key Projects of Science and Technology Innovation 2025 Plan [2020Z030, 2020Z057, 2021Z124]
- Ningbo Natural Science Foundation [2021J210]
- Zhejiang Provincial Science and Technology Innovation Project [2019R52029 2021]
- International Postdoctoral Exchange Fellowship Program [YJ20210190]
By grafting functionalized graphene oxide onto carbon fiber, the interfacial and mechanical properties of carbon fiber reinforced polyamide 6 composites can be improved. The functionalized graphene oxide enhances interfacial compatibility and wettability, and retards crack propagation along the interface based on the reinforcement effect. The CF/PA6 composites treated with the modified sizing agent exhibit higher interfacial shear strength, interlaminar shear strength, tensile strength, and flexural strength.
In this study, a novel functionalized graphene oxide (F-GO) modified polyamide 6 (PA6) sizing agent is developed to improve the interfacial and mechanical properties of carbon fiber (CF) reinforced PA6 composites. To enhance compatibility between GO and sizing agent, PA6 molecular chains are covalently grafted onto the GO sheets in advance. The results show that the F-GO modified sizing layer improves interfacial compatibility and wettability of the CF surface. Moreover, F-GO nanoparticles retard crack propagation along the interface based on the reinforcement effect. Accordingly, the interfacial shear strength increases by 54.5% from 45.1 MPa for desized CF/PA6 composites to 69.7 MPa for F-GO modified sizing agent treated CF/PA6 composites. Meanwhile, the average interlaminar shear strength, tensile strength, and flexural strength increase by 45.2%, 15.6%, and 19.3% from 45.7, 1307.4, and 792.2 MPa for desized CF/PA6 composites to 66.3, 1511.2, and 945.2 MPa for those reinforced with the CFs treated by the F-GO modified sizing agent due to the effective stress transfer across the interface. The improvement in the mechanical properties is verified based on the cross-section morphology and fracture surfaces.
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