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Micromechanical analysis of bioresorbable PLLA/Mg composites coated with MgO: Effects of particle weight fraction, particle/matrix interface bonding strength and interphase

Magnesium (Mg) particles has been recently introduced in a poly-l-lactic acid (PLLA) matrix to enhance to its mechanical properties. The coating of Mg particles could also regulate its degradation rate. The mechanical behavior of PLLA/Mg composite was characterized using a three dimensional Representative Volume Element model. The influences of Mg weight fraction, imperfect bonding between particle and polymer matrix, and the interphase layer on the mechanical behaviors of the composites were quantified. Results clearly demonstrated that the effective Young's modulus and yield strength of the composite was enhanced by the Mg particles, as well as its MgO coating. In addition, the imperfect interfacial bonding between the Mg particle and PLLA weakened the mechanical advantage of the composite, which was in good agreement with the documented experimental observations. This work might shed some light on the optimal design and manufacturing of the bioresorbable composites.

» Author: Hozhabr Mozafari, Pengfei Dong, Kewei Ren, Xinwei Han, Linxia Gu

» Reference: 10.1016/j.compositesb.2018.10.106

» Publication Date: 29/10/2018

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This project has received funding from the European Union Seventh Framework Programme (FP7/2007-2013) under grant agreement n° [609149].

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