Effect of Chemical Structure of Crosslinking Agent on Adhesion Properties of UV Cured 2-EHA/n-BA PSA

Pressure sensitive adhesives (PSAs) based with 2-ethylhexyl acrylate (2-EHA), n-butyl acrylate (n-BA) and different crosslinking agents were prepared by UV radiation curing. The effect of chemical structure and amounts of crosslinking agent, and also mixing ratio of co-monomer on adhesion properties of PSAs were presented. The results showed that the improvement of tack and peel strength of PSAs with 0.1 wt% of crosslinking agent was observed without cohesive failure and decreased with a higher concentration of crosslinking agent. A more increase in adhesion properties for PSAs with poly(ethylene glycol)dimethacrylate (PEGDMA) and diethylene glycol dimethacrylate (DEGDMA) was also investigated, which may be due to sustaining the chain flexibility by longer ethylene oxide chain and bulky methyl group in molecular backbone of crosslinking agent during the crosslinking process. It can be also found that the effect of repeating unit chain length on the adhesion properties between DEGDMA and PEGDMA system was insignificant in spite of their similar chemical structure.