Preparation of Polypropylene Grafted with Bi-Monomer Maleic Anhydride/N-Vinyl Pyrrolidone and Hydrophilic Modification of Polypropylene Microporous Membrane

An amphiphilic polypropylene-g-poly[maleicanhydride-co-vinylpyrrolidone] (PP-g-(MAH-co-NVP)) modifier was prepared by melt grafting polymerization using maleicanhydride (MAH) as grafting monomer and N-vinyl pyrrolidone (NVP) as comonomer. And hydrophilic microporous membrane comprising PP and PP-g-(MAH-co-NVP) was prepared via thermally induced phase separation method. The chemical structure and grafting degree (GD) of PP-g-(MAH-co-NVP) were determined by FT-IR and elemental analysis. Crystallization property and rheological behavior of modifier were investigated by DSC, XRD. Contact angle measurement, TGA, SEM and porosity analysis were used to study the effect of hydrophilic modification on PP membranes. The results show that hydrophilic branched chains are grafted onto PP macromolecular chains successfully; the GD of MAH is increased by 270% when the mole ratio of MAH/NVP is 1/1. And the crystallization of PP is accelerated by the addition of the second monomer NVP. Thermostability, pore number and porosity of modified membranes are better than those of the pure PP membrane. The hydrophilicity of modified PP microporous membrane is significantly improved and the contact angle decreases by 28.5%. © 2018, Editorial Board of Polymer Materials Science & Engineering. All right reserved.