New Functions of Polyolefin for Manipulated Iron Oxide Nanostructure Synthesis

摘要

An old-fashioned polypropylene (PP) grafted maleic anhydride, denoted as PP-g-MA, was sucessfully utilized to serve as polymeric surfactant to synthesize stable magnetic nanoparticles (NPs) through a facile one-pot bottom up method. To be specific, through thermal decomposing organometallic precursor, Fe(CO)_5/Co2(CO)_8 in refluxing PP-g-MA–solvent, or PP–PP-g-MA–xylene: 1.) PP-g-MA (Mn≈ 8000 g/mol) with different concentration exhibited simutaneously control over the morphologies (hollow NPs vs. chain-like nanostructures), crystalline phases (α- vs. γ- phase) and magnetic properties (super-paramagnetic vs. hard ferromagnetic) in synthesizing Fe2O3 NPs; 2.) PP-g- MAs with different backbone chain-lengths (M_n≈ 2500, and 800 g/mol) were demonstrated in controlling the cobalt morphologies (dispersed polyhedral vs. self-assembled nanchian structure), crystalline phases (ε- vs. β- phase), and magnetic property (242 vs. 808 Oe coercivity) in the synthesized magnetic PP nanocomposites.