原位气泡拉伸法(ISBS)制备LDPE/nano-Mg(OH)2复合材料力学性能研究

用ISBS方法制备的纳米复合材料的力学性能远远优于用一般的熔融共混方法制备的复合材料的性能。ISBS方法制备的LDPE/nano-Mg(OH)2复合材料在一定添加量范围内,拉伸强度随着添加量的增加而增大,在添加量为15 phr时达到最大值,然后随着添加量的增加而下降,但仍然要远远高于纯LDPE的拉伸强度。

Mechanical Properties of Low Density Polyethylene/nano-magnesium Hydroxide Composites Prepared by an In-situ Bubble Stretching Method

Low density polyethylene/nano-magnesium hydroxide(LDPE/nano-Mg(OH)2) composites had been prepared by an in-situ bubble stretching(ISBS) method and simple shear method.By means of Field Emission Scanning Electron Microscopy(FE-SEM) and Transmission Electron Microscopy(TEM),it was confirmed that the ISBS method lead to a high degree of dispersion of the Mg(OH)2 nanoparticles in the LDPE matrix.Furthermore,no significant re-aggregation of the nanoparticles was observed after removing the bubbles by means of high-speed grinding.The tensile strengths of nanocomposites prepared by means of the ISBS method were higher than those of materials with the same Mg(OH)2 loading produced by direct blending/extrusion.The tensile strength of the nanocomposites produced by the ISBS method reached a maximum value at an Mg(OH)2 content of 15 phr.In contrast,the tensile strength of composites prepared by direct blending/extrusion shows a monotonic decrease with increasing Mg(OH)2 content.The improvement in mechanical properties of nanocomposites associated with the use of the ISBS method can be attributed to a more homogeneous dispersion of smaller nanoparticles.