Improvement of environmental stress cracking resistance of polycarbonate by silicone coating |
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| Institution: | 1. School of Materials Science and Engineering, Zhengzhou University, 100 Kexue Road, Zhengzhou, 450001, PR China;2. National Engineering Research Center for Advanced Polymer Processing Technology, Zhengzhou University, 97 Wenhua Road, Zhengzhou, 450002, PR China;3. College of Mechatronic Engineering, Henan University of Technology, 100 Lianhua street, Zhengzhou, 450001, PR China;1. Center for Advanced Materials, Qatar University, PO Box 2713, Doha, Qatar;2. Institute of Macromolecular Chemistry, Academy of Sciences of the Czech Republic, Heyrovského nám. 2, 162 06 Praha, Czechia;1. Institute of Chemical Materials, China Academy of Engineering Physics, Mianyang, 621900, China;2. College of Polymer Science and Engineering, State Key Laboratory of Polymer Materials Engineering, Sichuan University, Chengdu, 610065, China;1. Department of Mechanical Engineering, Faculty of Engineering of Bilbao, University of the Basque Country (UPV/EHU), Rafael Moreno “Pitxitxi” 2-3, 48013 Bilbao, Spain;2. Department of Mining, Metallurgy and Science of Materials, Faculty of Engineering of Bilbao, University of the Basque Country (UPV/EHU), Rafael Moreno “Pitxitxi” 2-3, 48013 Bilbao, Spain;3. Materials Testing and Simulation, Leartiker (Lea-Artibai Development Center), Xemein Avenue 12-A, 48270 Markina, Xemein, Spain;1. Department of Textile Technology, Indian Institute of Technology Delhi, Hauz Khas, New Delhi, 110 016, India;2. Department of Civil Engineering, National Institute of Technology Rourkela, Odisha, 769008, India |
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| Abstract: | To explore the possibility of using surface coating to reduce environmental stress cracking (ESC) of transparent polycarbonate (PC) parts, silicone coated and SiO2 coated PC were tested in a self-made three-point bending apparatus in the presence of ethanol. The variation of stress with time was recorded, and the surface cracking was observed to evaluate the ESC resistance of samples. Slower stress relaxation rates and fewer surface cracks indicated that silicone coating improved the ESC resistance of PC, but SiO2 coated PC was found to be no better than that of uncoated PC. Silicone coating reduced the absorption of ethanol in PC, weakening the surface plasticization, thus hindering the formation and development of cracks in PC. Nanoindentation test results showed that the mechanical properties such as hardness and elastic modulus of silicone coating are a better match for PC than SiO2 coating. This allows the silicone coating to have a favorable effect in providing continuous protection for PC under the combined action of ethanol and stress. |
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| Keywords: | Environmental stress cracking Silicone coating Stress relaxation Polycarbonate |
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