Study On Vapour Phase Surface Grafting Polymerization Of Acrylonitrile And Barrier Property Of The Grafted Film

Polymer surface grafting modification is of prime importance in polymer applications from the viewpoint of both academies and industries. This thesis was designed to study vapour phase surface grafting polymerization of acrylonitrile onto low density polyethylene (LDPE) film using benzoyl peroxide (BPO) as an initiator. The purpose was to develop a new and more effective method to modify the surface properties of polyolefines by studying the grafting mechanism of the system and exploring the characteristics of the grafting process. Moreover, the barrier property of grafted films against oxygen was investigated.With vapour phase surface grafting polymerization, AN was grafted onto LDPE film successfully, and grafting efficiency (Ge) approached 100%. The polymerization features, mechanism and the property of the grafted film were investigated systematically. Key factors, e.g., initiator, initiator solvent, amount of monomer, etc., affected polymerization process: the grafting reactivity of BPO was far higher than that of azobisisobutyronitrile (AIBN), BPO/N,N- dimethylaniline redox system and BPO/triethylamine redox system;...