Effect of BaTiO3 on the aging process of PLA fibers obtained by centrifugal spinning |
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Authors: | F Boschetto HN Doan PP Vo M Zanocco W Zhu W Sakai K Kinashi E Marin G Pezzotti |
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Institution: | 1. Ceramic Physics Laboratory, Kyoto Institute of Technology, Sakyo-ku, Matsugasaki, 606-8585 Kyoto, Japan;2. Department of Dental Medicine, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, Kamigyo-ku, Kyoto 602-8566, Japan;3. Department of Immunology, Kyoto Prefectural University of Medicine, Kamigyo-ku, Kyoto 602-8566, Japan;4. Department of Orthopedic Surgery, Tokyo Medical University, 6-7-1 Nishi-Shinjuku, Shinjuku-ku, 160-0023 Tokyo, Japan;5. The Center for Advanced Insect Research Promotion (CAIRP), Kyoto Institute of Technology, Sakyo-ku, Matsugasaki, 606-8585 Kyoto, Japan |
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Abstract: | This study focused on the fabrication of a composite of polylactic acid fibers reinforced with barium titanate (BT) and obtained by centrifugal spinning. Different concentrations of inorganic powder (5, 10, and 15 wt%) have been added to the polymeric solution and the samples have been studied to monitor any modification in chemical, morphological, thermal, and mechanical properties. Subsequently, samples have been subjected to UV/O3 irradiation at two different times (5 and 10 min) with the aim to verify the resistance to aging, which is considered a key factor for medical applications and outdoor. The presence of BT influenced strongly the structure of the fibers in many aspects. Samples with the lowest amount of BT showed a clear decrease of chemical and consequently of mechanical properties manifested with the breakage of the fibers subjected to treatment. The other composites apparently showed similar chemical properties comparing with the one without fillers but the mechanical properties clearly decreased. However, what emerged from the study is a clear stability during the aging tests promoted by the presence of BT. The samples with 10 and 15 wt% of BT presented chemical, thermal, and mechanical stabilities differently from the other samples. These results suggested that the fillers clearly modified the degree of crystallinity acting as nucleation agents and promoting the development of a stable crystalline phase during the treatment. |
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Keywords: | Polylactic acid Barium titanate Composite fibers Crystallization |
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