Study On Antifogging Polyethylene Film

In this paper the relationship between the structure of antifogging agent and properties of antifogging were studied. It was also researched that the co operative effect among different antifogging agents, and some factors effecting the performance of the PE film were discussed; The study showed: the lasted antifogging was improved with increasing the carbon chains; The antifogging agents with hydrophilic radical has excellent initial antifogging; When different antifogging agents were mixed the initial and lasted antifogging were improved at the same time, but different compounded system had different effects; The introduce of other agents such as florin surfactant, the buffering agent of antifogging agent and the antiaging agent also effect antifogging.Moreover, grafting the monomer of MAA on the chain of PE improved the performance of antifogging. The results showed: the copolymer of PE-g-MAA had longer antifogging period compared with PE and EVA; The antifogging period prolonged with the increase of the content of the monomer , and reach the maximum when properly parts were introduced; The effect of initiator one was better than initiator two; The introduce of electron donors increase the fluidity and improve the appearance of the film; The properties of the film was improved after getting rid of the remained monomer; Some processing conditions, such as the speed of screw, extruded instrument etc, also effect the properties of the film. Differential scanning calorimeter(DSC) was used to compare the changes of thermal properties between PE and its grafted copolymer. It was found that Tm changed slightly, but Tc and AH changed a lot, the crystallinity of grafted copolymer decreased.