Sustainable Isosorbide-based Transparent Pressure Sensitive Adhesives for Optically Clear Adhesive and Their Adhesion Performance

A biomass-based isosorbide acrylate (ISA) was synthesized in a one-pot reaction under low temperature and a quite slow dropwise technique using syringe pump. Using the ISA monomer, UV-cured transparent acrylic pressure sensitive adhesives (PSAs) composed of semi-interpenetrating networks were prepared. This study investigated the effect of ISA on the adhesion performance of the resulting acrylic PSAs by changing the ISA mole content, while fixing the mole ratio between 2-ethylhexyl acrylate (2-EHA) and 2-hydroxyehtyl acrylate (2-HEA) in the PSAs. The prepared acrylic PSAs, ranging from 3.2-14.3 mol-% ISA, were evaluated by 180° peel strength, probe tack, static shear testing, and optical properties. Increasing the ISA mole content in the acrylic PSAs increased the adhesion properties, such as the 180° peel strength (0.25-0.32 N/25 mm), shear holding power (0.086-0.023 mm), and probe tack (1.21-2.26 N). Dynamic mechanical analysis indicated that ISA is a good candidate monomer, playing the role of adhesion promoter and hard monomer in these acrylic PSAs.

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