Effect of fiber surface modification on the lifetime of glass fiber reinforced polymerized cyclic butylene terephthalate composites in hygrothermal conditions |
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| Affiliation: | 1. Smart Structures and Advanced Composite Materials Lab, College of Aerospace and Civil Engineering, Harbin Engineering University, Harbin 150001, China,;2. Department of Mechanical Engineering, The Hong Kong Polytechnic University, Hong Kong, China;1. Queensland Centre for Advanced Materials Processing and Manufacturing (AMPAM), School of Mechanical and Mining Engineering, The University of Queensland, Brisbane, Queensland 4072, Australia;2. School of Science and Engineering, University of the Sunshine Coast, Sippy Downs, Queensland 4575, Australia;1. Department of Mechanical and System Engineering, Graduate School of Engineering, University of Hyogo, 2167 Shosha, Himeji, Hyogo 671–2280, Japan;2. Department of Mechanical Engineering, National University Corporation-Kitami Institute of Technology, 165 Koen-cho, Kitami, Hokkaido 090–8507, Japan;3. Kitami Institute of Technology, 165 Koen-cho, Kitami, Hokkaido 090–8507, Japan;1. School of Materials, The University of Manchester, Manchester M13 9PL, United Kingdom;2. School of Mechanical, Aerospace & Civil Engineering, The University of Manchester, Manchester M13 9PL, United Kingdom;1. Key Laboratory of Superlight Materials & Surface Technology, Ministry of Education, Harbin Engineering University, Harbin 150001, PR China;2. Shenyang Jinbo Gas Compression Manufacturing Co. Ltd., Shenyang 110027, PR China;1. IFIMUP and IN — Institute of Nanoscience and Nanotechnology, Departamento de Física e Astronomia da Faculdade de Ciências da Universidade do Porto, Rua Campo Alegre, 687, 4169-007 Porto, Portugal;2. CFNUL — Centro de Física Nuclear da Universidade de Lisboa, Av. Prof. Gama Pinto, 2, 1649-003 Lisboa, Portugal;3. Blackett Laboratory, Imperial College, London SW7 2AZ, United Kingdom;1. Research Institute of Materials, Ocean university of China, Tsingdao 266100, People''s Republic of China;2. Key Laboratory for Liquid–Solid Structural Evolution and Processing of Materials, Ministry of Education, Shandong University, Jinan 250061, People''s Republic of China |
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| Abstract: | Mechanical performances of polymerized cyclic butylene terephthalate (pCBT) matrix, glass fiber reinforced pCBT (GF/pCBT), and nano-silica modified glass fiber/pCBT composites (nano-GF/pCBT) in hygrothermal condition were investigated. All the materials were aged in hygrothermal environments for up to three months, and then their mechanical strength degeneration ratio (SDR) was calculated. To study the aging effect of temperature, specimens with and without nano-silica modification were tested in temperatures ranging from 298 to 500 K. Differential scanning calorimeter (DSC) test, dynamic mechanical analysis (DMA), and fiber pull-out test were adopted to complement the experimental results. It is found that all the SDR-time curves follow the linear relationship in hygrothermal environment, while SDR-temperature curves follow a bilinear relationship due to the effect of glass transition temperature (Tg) of the matrix. Fibers modified by coating nano-silica on the surface could decrease SDR of the composites. This is due to the fact that the fillers on the fiber surface could resist the movement of pCBT molecular chain and diffusion of water molecules in aging conditions. The fiber pull-out test verifies that the interface strength between fiber and matrix is enhanced by the modification. |
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