3O 4 nanoparticles on the morphology and scCO 2 batch-foaming behavior of cocontinuous LLDPE/PS immiscible blends at semi-solid state]]>

摘要

AbstractThe influence of oleic acid modified Fe3O4(OA-Fe3O4) nanoparticles on the morphology and foaming behavior of cocontinuous linear low density polyethylene/polystyrene (LLDPE/PS) immiscible blends (60/40 by weight) was studied. The morphology observation showed that the addition of nanofillers resulted in the increased dispersion degree of both LLDPE and PS components and even the transformation of phase structure from cocontinuous structure to sea-island structure, when enough amounts of nanoparticles were added. Meanwhile the introduction of enough amounts of OA-Fe3O4nanoparticles effectively enhanced the foaming ability of LLDPE/PS blend at semi-solid state during scCO2batch foaming. The mechanism analysis for the change of foaming behavior showed that the improved foaming capacity resulted from the change of the phase structure of LLDPE/PS blends and heterogeneous nucleation of OA-Fe3O4nanofillers. Sorption and desorption measurements showed that the addition of OA-Fe3O4nanoparticles in the LLDPE/PS blend increased the solubility of CO2, and the presence of enough amount of OA-Fe3O4decreased the desorption rate of CO2in the initial period of depressurization process, which are beneficial to cell nucleation and growth. Furthermore, it was f