Simultaneously reinforcing and toughening poly(lactic acid) by incorporating reactive melt-functionalized silica nanoparticles |
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| Authors: | Bo Wang Xin Zhang Lutong Zhang Yuezhan Feng Chuntai Liu Changyu Shen |
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| Affiliation: | College of Materials Science and Engineering, National Engineering Research Center for Advanced Polymer Processing Technology, Key Laboratory of Materials Processing and Mold of Ministry of Education, Zhengzhou University, Zhengzhou, 450001 China |
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| Abstract: | Simultaneously reinforcing and toughening poly(lactic acid) (PLA) was carried out by adding a small amount of functionalized SiO2 (f-SiO2) with grafting degraded PLA chains in this work. Typically, the high shear force and high temperature condition of melt blending were employed to accelerate the degradation of PLA and graft the degraded PLA chains onto SiO2.The structure characterizations revealed that large quantity of degraded PLA chains were grafted onto the surface of SiO2 by transesterification, condensation, and esterification reactions during melt blending. Due to the improvement in dispersion and interfacial interaction in PLA matrix, the f-SiO2 exhibited an effective reinforcing and toughening effect for PLA, where the tensile strength, elongation at break, and impact toughness of PLA/f-SiO2 nanocomposite increased by 14.9, 47.8, and 30.3% compared to neat PLA. Besides, the degree of crystallinity of PLA was significantly improved by the added f-SiO2, which also contributed to improving mechanical properties. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020 , 137, 48834. |
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| Keywords: | grafting nanoparticles nanowires and nanocrystals thermoplastics |
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