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| Aging Behavior and Performance Changes of Polyamide Engineering Plastics in Typical Atmospheric Environments |
| Received:January 16, 2025 Revised:March 05, 2025 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7643/issn.1672-9242.2025.04.018 |
| KeyWord:FRPA6G30B natural exposure aging behavior hygroscopic absorption apparent morphology mechanical properties thermal analysis |
| Author | Institution |
| LI Qian |
Equipment Environmental Engineering Research Center, Southwest Institute of Technology and Engineering, Chongqing , China;Environmental Effects and Protection of Chongqing Key Laboratory, Chongqing , China |
| GUO Zanhong |
Equipment Environmental Engineering Research Center, Southwest Institute of Technology and Engineering, Chongqing , China |
| HU Tao |
Equipment Environmental Engineering Research Center, Southwest Institute of Technology and Engineering, Chongqing , China;Environmental Effects and Protection of Chongqing Key Laboratory, Chongqing , China |
| WANG Ling |
Equipment Environmental Engineering Research Center, Southwest Institute of Technology and Engineering, Chongqing , China;Environmental Effects and Protection of Chongqing Key Laboratory, Chongqing , China |
| LIU Jianhong |
Equipment Environmental Engineering Research Center, Southwest Institute of Technology and Engineering, Chongqing , China;Environmental Effects and Protection of Chongqing Key Laboratory, Chongqing , China |
| ZHAO Fangchao |
Equipment Environmental Engineering Research Center, Southwest Institute of Technology and Engineering, Chongqing , China;Environmental Effects and Protection of Chongqing Key Laboratory, Chongqing , China |
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| Abstract: |
| The work aims to explore the aging behavior and key performance changes of polyamide engineering plastics in typical atmospheric environments (marine atmosphere, plateau low-pressure atmosphere, cold and low-temperature atmosphere, dry and hot deserts), providing data and theoretical support for the design of engineering plastics for equipment components and environmental effect control. The outdoor exposure test of FRPA6G30B polyamide samples was carried out, and the changes in appearance, morphology, mechanical properties and spectral characteristics of polyamide samples were analyzed by mechanical testing machine, optical microscope and Fourier transform infrared spectroscopy. FRPA6G30B engineering plastics appeared to have different degrees of discoloration, chalking and fiber exposure after 4 years of natural testing in different environments, especially in Wanning and Mohe stations, where the surface of the samples was even covered with mold after the test in Wanning. In addition, the infrared spectroscopy also revealed signs of aging, including the weakening of the intensity of the characteristic peaks and the emergence of new characteristic peaks. The mechanical properties of the sample were significantly affected by "hygroscopic absorption-dehumidification" during the whole test. Under different test environments, the aging characteristics and mechanical properties of FRPA6G30B samples are similar, and the aging characteristics are discoloration, chalking and fiber exposure. The change of properties is closely related to the "hygroscopic absorption-dehumidification" of the material, and there are two main change trends, namely that firstly, the tensile strength and flexural strength change law is shown to be flat after a short period of decline, and the decline range is almost 30% and secondly, the change law of impact strength and fracture strain shows that the short-term sudden increase is followed by undulating fluctuations, and the increase reaches 100%. |
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