Diffusion behavior and effect of plasticizer in acrylate pressure sensitive adhesive
In order to investigate the diffusion behavior of plasticizer dioctyl phthalate(DOP)in acrylate pressure sensitive adhesive,the pressure sensitive adhesive system consisting of 2-ethylhexyl acrylate(2-EHA),methyl acrylate(MA),and acrylic acid(AA)was prepared.Using methods such as molecular weight distribution(GPC),dynamic mechanical analysis(DMA),thermogravimetric analysis(TG),and mechanical testing,the effects of initiator content,crosslinking agent content at different plasticizer concentrations,and different plasticizer and tackifying resin contents under the same crosslinking agent content on the performance of pressure sensitive adhesive were investigated.The research results showed that when the molecular weight increased,the diffusion behavior of plasticizer DOP slowed down and tended towards equilibrium.As the crosslinking degree of adhesive sample increased,the diffusion behavior of plasticizer DOP would be significantly slowed down.When the contents of crosslinking agent and DOP were changed simultaneously,both crosslinking agent and DOP would reduce the initial tack and peel strength.After DOP entered the acrylate adhesive layer containing the tackifying resin system,the adhesion behavior would also change with the content of the tackifying resin.
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