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Fabrication, Crystalline Behavior, Mechanical Property and In-Vivo Degradation of Poly(l–lactide) (PLLA)–Magnesium Oxide Whiskers (MgO) Nano Composites Prepared by In-Situ Polymerization

1
School of Materials Science and Engineering, Tianjin University of Technology, Tianjin 300384, China
2
Chimie des Interactions Plasma-Surface, University of Mons (Umons), 20 Place du Parc, B 7000 Mons, Belgium
3
Key Laboratory of Display Materials and Photoelectric Device (Ministry of Education), Tianjin 300384, China
4
School of Environment Science and Safety Engineering, Tianjin University of Technology, Tianjin 300384, China
*
Authors to whom correspondence should be addressed.
Polymers 2019, 11(7), 1123; https://doi.org/10.3390/polym11071123
Received: 3 May 2019 / Revised: 26 May 2019 / Accepted: 28 May 2019 / Published: 2 July 2019
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Abstract

The present work focuses on the preparation of poly(l–lactide)–magnesium oxide whiskers (PLLA–MgO) composites by the in-situ polymerization method for bone repair and implant. PLLA–MgO composites were evaluated using Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), differential scanning calorimetry (DSC), scanning electron microscopy (SEM) and solid-state 13C and 1H nuclear magnetic resonance spectroscopy (NMR). It was found that the whiskers were uniformly dispersed in the PLLA matrix through the interfacial interaction bonding between PLLA and MgO; thereby, the MgO whisker was found to be well-distributed in the PLLA matrix, and biocomposites with excellent interface bonding were produced. Notably, the MgO whisker has an effect on the crystallization behavior and mechanical properties; moreover, the in vivo degradation of PLLA–MgO composites could also be adjusted by MgO. These results show that the whisker content of 0.5 wt % and 1.0 wt % exhibited a prominent nucleation effect for the PLLA matrix, and specifically 1.0 wt % MgO was found to benefit the enhanced mechanical properties greatly. In addition, the improvement of the degrading process of the composite illustrated that the MgO whisker can effectively regulate the degradation of the PLLA matrix as well as raise its bioactivity. Hence, these results demonstrated the promising application of PLLA–MgO composite to serve as a biomedical material for bone-related repair. View Full-Text
Keywords: PLLA–MgO whiskers composites; in-situ polymerization; bone repair and fixation; mechanical properties and crystallization behavior; regulating in-vivo degradation PLLA–MgO whiskers composites; in-situ polymerization; bone repair and fixation; mechanical properties and crystallization behavior; regulating in-vivo degradation
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Liang, H.; Zhao, Y.; Yang, J.; Li, X.; Yang, X.; Sasikumar, Y.; Zhou, Z.; Chen, M. Fabrication, Crystalline Behavior, Mechanical Property and In-Vivo Degradation of Poly(l–lactide) (PLLA)–Magnesium Oxide Whiskers (MgO) Nano Composites Prepared by In-Situ Polymerization. Polymers 2019, 11, 1123.

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