PSI - Issue 52

Hideaki Katogi et al. / Procedia Structural Integrity 52 (2024) 611–617 Hideaki Katogi/ Structural Integrity Procedia 00 (2019) 000 – 000

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affected during outdoor exposure test. The optical degradation on the surface of polyurethane of synthetic leather occurred during outdoor exposure test. Therefore, the tensile property of synthetic leather was affected by optical degradation of polyurethane under outdoor exposure environment. 4. Conclusions This study was examined effect of outdoor exposure on tensile property of synthetic leather for personal mobility. As a result, the tensile property of synthetic leather decreased after outdoor exposure test. From fracture observation, fracture morphologies of synthetic leathers became flat before and after outdoor exposure tests. Also, the long fiber pull-out in fracture morphology of synthetic leather did not occur after outdoor exposure test. Generally, water absorptions of polyester and polyurethane as constituent material do not occur during outdoor exposure environment because water absorption rates of polyester and polyurethane are small. Tensile properties of polyester and polyurethane were not probably affected by water absorption under outdoor exposure environment. But, Tthe constituent material on surface of synthetic leather was probably degraded by ultraviolet irradiation. Therefore, tensile property of synthetic leather was mainly affected because of optical degradation of constituent material by ultraviolet irradiation under outdoor exposure environment. References 1. Nikkei Asia: Japan drone maker's flying motorcycle to hit the skies next year, https://asia.nikkei.com/Business/Technology/Japan-drone maker-s-flying-motorcycle-to-hit-the-skies-next-year, Oct. 2021. 2. Mitsui, M., Yoshida, K., Ishii, Y., Shirai, K., Chonan, Y., Okamura1, H., 1999. Hygienic Study on Shoes Part 1 : Effect of Shoe Materials on Wear Comfort and Microclimate Between Shoes and Skin. Journal of the Japan Research Association for Textile End ‐ Uses 40, 333-341 (in Japanese). 3. Tsubokura, H., Kubo, Y., Kubo, Y., 1977, On the Properties of Leather Boards from Leather Dusts for Shoe Insole. Japanese Journal of Zootechnical Science 48, 198-204 (in Japanese). 4. Enomoto, M., Tokino, S., Maekawa, M., Shirai, K., Kobayashi, M., 2022, Physical Properties of Polyurethane Resin Using Isosorbide Containing Polycarbonate Diol for Wrinkle Formation on Synthetic Leather Surface. Journal of the Japan Research Association for Textile End-Uses 63, 185-192 (in Japanese). 5. Fernández-Rodríguez, J., Lorea, B., González-Gaitano, G., 2022, Biological Solubilisation of Leather Industry Waste in Anaerobic Conditions: Effect of Chromium (III) Presence, Pre-Treatments and Temperature Strategies. International Journal of Molecular Sciences 23, 13647. 6. Tian, Y., Wang, J., Zheng, S., He, X., Liu, X., 2022, Research on the Preparation and Application of Synthetic Leather from Coffee Grounds for Sustainable Development. Sustainability 14, 13971. 7. Xing, W., Xi, J., Cai, W., Zhang, W., Wang, B., Chen, L., Hu, Y. 2023, Preparation and Properties of Multifunctional Polyurethane Synthetic Leather Nanocomposites. Composites Part A: Applied Science and Manufacturing 169, 107534. 8. Sun, Z., Wen, J., Guan, J., Fan, H., Fang, J., Chen, Y., Wang, W., Gao, Q., 2022, Preparation, Mechanical and Thermal Properties of Polydimethylsiloxane Coating for Synthetic Leathers. Journal of Coatings Technology and Research 19, 1743-1755. 9. Fujimoto, E., Nakamura, K., 1994, Analysis of Photodegradation Mechanism of Polyurethane Using FT-IR-ATR and DMA. KOBUNSHI RONBUNSHU 51, 612-618 (in Japanese). 10. Katogi, H., Tsunekawa, H. 2021, Short-Term Outdoor Exposure Effects on Cotton fabric Abrasion Properties. WIT Transactions on Engineering Sciences, 133, 47-54. 11. Katayama, T., Tanaka, K., Murakami, T., Uno, K., 2006, Compression Moulding of Jute Fabric Reinforced Thermoplastics Composites Based on PLA Non-Woven Fabric. WIT Transactions on the Built Environment 85, 159-167. 12. Goda, K., Cao, Y., 2007, Research and Development of Fully Green Composites Reinforced with Natural Fiber. Journal of Solid Mechanics and Materials Engineering 1, 1073-1084. 13. Huang, X., Netravali, A. 2007, Characterization of Flax Fiber Reinforced Soy Protein Resin Based Green Composites Modified with Nano Clay Particles. Composites Science and Technology 67, 2005-2014. 14. Xie, Y., Hill, C. A. H., Xiao, Z., Militz, H., Mai, C., 2007, Silane Coupling Agents Used for Natural Fiber/Polymer Composites: a Review. Composites Part A: Applied Science and Manufacturing 41, 806-819. 15. Ogihara, S., Okada, A., Kobayashi, S., 2008, Mechanical Properties in a Bamboo Fiber/PBS Biodegradable Composite. Journal of Solid Mechanics and Materials Engineering 2, 291-299. 16. John, M. J., Thomas, S., 2008, Biofibres and Biocomposites. Carbohydrate Polymers 71, 343-364. 17. Ren, B., Mizue, T., Goda K., Noda, J., 2012, Effects of Fluctuation of Fibre Orientation on Tensile Properties of Flax Sliver-Reinforced Green Composites. Composite Structures 94, 3457-3464. 18. Katogi, H., Shimamura, Y., Tohgo, K., Fujii, T., Takemura, K., 2012, Fatigue Behavior of Unidirectional Jute Spun Yarn Reinforced PLA. Advanced Composite Materials 21, 1-10.