Mechanical Properties of Polylactic Acid Composites Based on Rare Earth Hydroxide with Different Morphologies
In this paper,praseodymium hydroxide(Pr(OH)3)whisker,neodymium hydroxide(Nd(OH)3)whisker and layered samarium hydroxide(Sm(OH)3)were synthesized by hydrothermal method.They were characterized by X-ray diffraction and scanning electron microscopy.Then,the prepared rare earth hydroxides were added in-to polylactic acid(PLA)by melt blending with different addition amounts,and the effects of diverse morpholo-gies of rare earth hydroxides on the mechanical properties of PLA are discussed.The results show that added 1.0％rare earth hydroxide exhibits excellent mechanical properties.The elongation at break of PLA/Pr(OH)3 and PLA/Nd(OH)3 composites increases from 5.8％of pure PLA to 118.0％and 82.7％,respectively.In particu-lar,the tensile strength of PLA/Sm(OH)3 composites reaches 61.6 MPa and the elongation at break increases to 195.0％,there is a significant increase in toughness while maintaining strength.Finally,the analysis of the ten-sile fracture surface shows that the uniform dispersion of Pr(OH)3,Nd(OH)3,Sm(OH)3 in the PLA matrix,and the nano-crosslinked network structure are the possible toughening mechanisms.
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