Journal
COMPOSITES SCIENCE AND TECHNOLOGY
Volume 204, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.compscitech.2020.108634
Keywords
Hybrid fibers; Polyurethane; Composite; Pultrusion process; Performance
Categories
Funding
- National Natural Science Foundation of China [U1604253]
- Key Scientific and Technological Projects of Henan Province - China [202102210043]
- Opening Project of Key Laboratory of Materials Processing and Mold - Zhengzhou University China [NERC202001]
- Student Research Training Plan of Henan University of Science and Technology - China [2020137]
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Polyvinyl alcohol-graphene oxide-oxidized carbon nanotube hybrid coatings were used to modify glass fibers and carbon fibers, resulting in modified hybrid composites with different concentric structures. The hybrid structure optimized the mechanical properties of the composites by combining the advantages of the two types of fiber reinforcement, with interface strength playing a crucial role. Mechanical properties were significantly enhanced after modification, and interlaminar shear strength was improved with hybrid coating.
Polyvinyl alcohol-graphene oxide-oxidized carbon nanotube (PVA-GO-OCNT) hybrid coatings were adopted to modify glass fibers (GFs) and carbon fibers (CFs), and modified GF/CF-reinforced polyurethane hybrid composites (PVA-GO-OCNTs-HFs/PUs) with different concentric hybrid structures were prepared. The synergistic effect of the hybrid structure and surface modification of hybrid fibers (HFs) on the mechanical properties of hybrid composites was investigated systematically. The results show that the hybrid structure can optimize the comprehensive mechanical properties of HF-reinforced composites (HFRCs) by combining the performance advantages of the two types of fiber reinforcement, and the strength of the interface between HFs and polyurethane (PU) plays a crucial role in whether the advantages of the hybrid structure can be fully achieved. In addition, the mechanical properties of the composite were significantly enhanced, and the structural advantages of the hybrid structure were further improved after HFs were modified by PVA-GO-OCNT hybrid coating. The hybrid effect on the tensile strength of HFRCs with CF as the core and GF as the shell changes from a negative hybrid effect (5.4%) before modification to a positive hybrid effect (4.3%). The hybrid effect in tensile failure strain of HFRCs with GF as the core and CF as the shell changes from a negative hybrid effect (2.1%) before modification to a positive hybrid effect (2.1%). Moreover, the interlaminar shear strength of HFRCs modified by PVA-GO-OCNT hybrid coating is significantly higher than that of unmodified HFRCs.
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