Interlaminar Mechanical Properties and Toughening Mechanism of Highly Thermally Stable Composite Modified by Polyacrylonitrile Nanofiber Films
This work concentrated on the interlaminar mechanical properties and toughening mechanism of carbon fiber-reinforced bismaleimide resin (CF/BMI) composites modified by polyacrylonitrile (PAN) nanofiber films. The PAN nanofiber films were prepared by electrospinning. End-notched flexure (ENF) and sho...
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MDPI AG
2022-03-01
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| Series: | Polymers |
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| Online Access: | https://www.mdpi.com/2073-4360/14/7/1348 |
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| author | Yingjian Ma Yangpeng Zhuang Chunwei Li Chuyang Luo Xing Shen |
| author_facet | Yingjian Ma Yangpeng Zhuang Chunwei Li Chuyang Luo Xing Shen |
| author_sort | Yingjian Ma |
| collection | DOAJ |
| description | This work concentrated on the interlaminar mechanical properties and toughening mechanism of carbon fiber-reinforced bismaleimide resin (CF/BMI) composites modified by polyacrylonitrile (PAN) nanofiber films. The PAN nanofiber films were prepared by electrospinning. End-notched flexure (ENF) and short-beam strength tests were conducted to assess the mode II fracture toughness (G<sub>IIc</sub>) and interlaminar shear strength (ILSS). The results showed that the G<sub>IIc</sub> and ILSS of PAN-modified specimens are 1900.4 J/m<sup>2</sup> and 93.1 MPa, which was 21.4% and 5.4% higher than that of the virgin specimens (1565.5 J/m<sup>2</sup> and 88.3 MPa), respectively. The scanning electron microscopy (SEM) images of the fracture surface revealed that the PAN nanofiber films toughen the composite on two scales. On the mesoscopic scale, the composite laminates modified by PAN formed a resin-rich layer with high strength and toughness, which made the crack propagate across the layers. At the microscopic scale, the crack propagation between two-dimensional nanofiber films led to constant pull-out and breakage of the nanofibers. As a result, the interlaminar fracture toughness of the composite laminates improved. |
| first_indexed | 2024-03-09T11:30:19Z |
| format | Article |
| id | doaj.art-2a055c3b74b045bcb4b2d0fb5fe2e7e2 |
| institution | Directory Open Access Journal |
| issn | 2073-4360 |
| language | English |
| last_indexed | 2024-03-09T11:30:19Z |
| publishDate | 2022-03-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Polymers |
| spelling | doaj.art-2a055c3b74b045bcb4b2d0fb5fe2e7e22023-11-30T23:53:13ZengMDPI AGPolymers2073-43602022-03-01147134810.3390/polym14071348Interlaminar Mechanical Properties and Toughening Mechanism of Highly Thermally Stable Composite Modified by Polyacrylonitrile Nanofiber FilmsYingjian Ma0Yangpeng Zhuang1Chunwei Li2Chuyang Luo3Xing Shen4State Key Laboratory of Mechanics and Control of Mechanical Structures, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, ChinaShanghai High Performance Fibers and Composites Center (Province-Ministry Joint), Center for Civil Aviation Composites, Donghua University, Shanghai 201620, ChinaAVIC General Huanan Aircraft Industry Co., Ltd., Zhuhai 519042, ChinaShanghai High Performance Fibers and Composites Center (Province-Ministry Joint), Center for Civil Aviation Composites, Donghua University, Shanghai 201620, ChinaState Key Laboratory of Mechanics and Control of Mechanical Structures, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, ChinaThis work concentrated on the interlaminar mechanical properties and toughening mechanism of carbon fiber-reinforced bismaleimide resin (CF/BMI) composites modified by polyacrylonitrile (PAN) nanofiber films. The PAN nanofiber films were prepared by electrospinning. End-notched flexure (ENF) and short-beam strength tests were conducted to assess the mode II fracture toughness (G<sub>IIc</sub>) and interlaminar shear strength (ILSS). The results showed that the G<sub>IIc</sub> and ILSS of PAN-modified specimens are 1900.4 J/m<sup>2</sup> and 93.1 MPa, which was 21.4% and 5.4% higher than that of the virgin specimens (1565.5 J/m<sup>2</sup> and 88.3 MPa), respectively. The scanning electron microscopy (SEM) images of the fracture surface revealed that the PAN nanofiber films toughen the composite on two scales. On the mesoscopic scale, the composite laminates modified by PAN formed a resin-rich layer with high strength and toughness, which made the crack propagate across the layers. At the microscopic scale, the crack propagation between two-dimensional nanofiber films led to constant pull-out and breakage of the nanofibers. As a result, the interlaminar fracture toughness of the composite laminates improved.https://www.mdpi.com/2073-4360/14/7/1348compositeselectrospinninginterlaminar strengthnanofiber filmtoughening mechanism |
| spellingShingle | Yingjian Ma Yangpeng Zhuang Chunwei Li Chuyang Luo Xing Shen Interlaminar Mechanical Properties and Toughening Mechanism of Highly Thermally Stable Composite Modified by Polyacrylonitrile Nanofiber Films Polymers composites electrospinning interlaminar strength nanofiber film toughening mechanism |
| title | Interlaminar Mechanical Properties and Toughening Mechanism of Highly Thermally Stable Composite Modified by Polyacrylonitrile Nanofiber Films |
| title_full | Interlaminar Mechanical Properties and Toughening Mechanism of Highly Thermally Stable Composite Modified by Polyacrylonitrile Nanofiber Films |
| title_fullStr | Interlaminar Mechanical Properties and Toughening Mechanism of Highly Thermally Stable Composite Modified by Polyacrylonitrile Nanofiber Films |
| title_full_unstemmed | Interlaminar Mechanical Properties and Toughening Mechanism of Highly Thermally Stable Composite Modified by Polyacrylonitrile Nanofiber Films |
| title_short | Interlaminar Mechanical Properties and Toughening Mechanism of Highly Thermally Stable Composite Modified by Polyacrylonitrile Nanofiber Films |
| title_sort | interlaminar mechanical properties and toughening mechanism of highly thermally stable composite modified by polyacrylonitrile nanofiber films |
| topic | composites electrospinning interlaminar strength nanofiber film toughening mechanism |
| url | https://www.mdpi.com/2073-4360/14/7/1348 |
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