镧化物改性超细碳酸钙对PP/POE力学性能的影响

将水溶性镧化物(La3+)对超细碳酸钙粒子(UCaCO3)进行表面改性,制得表面覆盖了镧化物分子层膜的UCaCO3微粉(UCaCO3 La3+),并采用共混填充法制备了PP/POE/UCaCO3和PP/POE/UCaCO3 La3+复合材料。力学性能测试表明,在一定用量范围内,UCaCO3和UCaCO3 La3+可提高材料的拉伸强度和弯曲强度,同时UCaCO3 La3+对体系有明显的增韧作用,而UCaCO3的加入则降低了PP/POE的冲击强度。用扫描电镜(SEM)对两种复合材料的冲击断面进行了分析。结果表明,UCaCO3经镧化物改性后,无机粒子与弹性体之间的相互作用加强,UCaCO3的团聚大大减弱,因而证实了镧化物的特殊改性效果。

Effect of Ultra-fine CaCO3 Modified by La3+ on the Mechanical Properties of PP/POE

Surface modification of ultra-fine calcium carbonate(UCaCO_3) particle was carried out with water soluble compound of lanthanum(La~3~+),and UCaCO_3 particle covered with a film of La~3~+ was prepared.The PP/POE/UCaCO_3 and PP/POE/UCaCO_3-La~3~+ composites were prepared by melt extrusion.The results of the mechanical property measurements showed that in the given range of contents, UCaCO_3 and UCaCO_3-La~3~+could improve tensile strength and flexural strength of the compo- sites.And the system acquired obvious toughening effect by UCaCO_3-La~3~+,but UCaCO_3 reduced the impact strength at the same time.Surface morphology of the impact fracture was analyzed by means of SEM.It was shown that the encapsulation of filler with elastomer could be achieved and the reunite of UCaCO_3 weakened by modifying the UCaCO_3 with La~3~+,so it approved the modifying effect of compound of lanthanum.