Preparation and Mechanical Properties of Layered Double Hydrotalcides/ /Polystyrene Nanocomposites Prepared by an in-situ Bubble Stretching Method

摘要

Layered double hydrotalcides/polystyrene (LDHs/PS) nanocomposites were produced by an in-situ bubble stretching (ISBS) method and simple shear method; the effect of LHDs content on the dispersion and the mechanical properties of nanocomposites was studied. The field emission scanning electron microscopy (FE-SEM) images indicated that the ISBS method leads to a high degree of dispersion of LDHs nanoparticles in PS matrix. Furthermore, it did not form a significant re-aggregation after defoaming by means of twin-screw extruder. Compared with the simple shear method, the un-notched impact strength and tensile strength of nanocomposites prepared by ISBS method were higher at the same amount of LDHs. The un-notched impact strength of the nanocomposites prepared by ISBS method reached a maximum value at the LDHs mass fraction of 5 % , the strength increased is 57.29 % greater than that of pure PS. The enhanced mechanical properties attributed to the effective dispersion of nanoscale LDHs by ISBS method.