Abstract:In this research, a reactive extrusion approach was selected to graft two types of polar monomers onto a metallocene linear low density polyethylene (mLLDPE) to increase the surface polarity of the films, and the films were subsequently subjected to corona treatment and coating of nanoparticle emulsions. The surface properties and bonding behaviors of the modified polyethylene films were systematically studied. ATR-FT-IR and XPS results indicate that the films have C=O and C-O functional groups on the surface after corona treatment, and C-C bond cleavage is observed on the film surface. Based on the contact angle results, the surface polarity of PE-g-DBM and PE-g-HEMA films is significantly improved after grafting the two types of polar monomers. SEM results indicate that the bonding between PE-g-DBM film surface and SiO2/Al2O3 nanoparticles is enhanced by grafting dibutyl maleate (DBM) monomer, and cracking of nano-coating during drying process is significantly reduced by grafting DBM onto polyethylene. It is also found that grafting DBM can effectively delay the aging process of the PE-g-DBM films during the acclerated aging tests, this contributes to extend the service life of high performance polyolefin greenhouse films.