Study on Preparation and Properties of La_2O_3/MC Nylon Nanocomposites

摘要

A series of La_2O_3/MG nylon nanocomposites were prepared via in situ polymerization. The effects of content of nano-La_2O_3 on the mechanical properties of nanocomposites were studied. Dispersion of nano-La_2O_3 in MC nylon matrix was observed with SEM. The crystal structure of nanocomposites was characterized by means of XRD. SEM analysis shows that La_2O_3 nanoparticles are uniformly dispersed in MC nylon matrix and little clustering exists when the content of nano-La_2O_3 is lower than 1 percent , however, when the content of nano-La_2O_3 is more than 1 percent, it begins to cluster. XRD analysis indicats that nano-La_2O_3 does not change the crystal structure of MC nylon. Mechanical properties tests show that the tensile strength, elongation at break, impact strength, flexural strength, and flexural modulus of nanocomposites first increase then decrease as the content of nano-La_2O_3 is increased. When the content of nano-La_2O_3 is 0.5 percent, the tensile strength and elongation at break of nanocomposites reach maximum, which are 17.9 percent and 52.1 percent higher respectively than those of MC nylon. When the content of nano-La_2O_3 is 1.0 percent, the impact strength, flexural strength and flexural modulus of nanocomposites reach maximum, which are 36.6 percent, 12.7 percent and 16.3 percent higher respectively than those of MC nylon.