Synthesis and evaluation of novel aromatic acrylic monomers for optically clear adhesive with high refractive index

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Abstract
Conventional optical polymers have low refractive index; (RI RIvalue were developed; that is, ionic monomer (PA.HEMA.NEt3.H+) withRI = 1.5150 and monomer (PA.BA.GMA) withRI = 1.5403. The monomers were then individually combined with a newly synthesized oligomer based on phthalic anhydride epoxy acrylate; that is, (EA.PA) withRI = 1.5567. The structures of the synthesized monomers and oligomer were confirmed by NMR and FTIR spectroscopy and the chemical titration of the structure end groups. Different combinations of the monomers with oligomer EA.PA were examined to develop a UV‐curing adhesive with appropriate viscosity. According to TGA and DMTA test results, the composition containing oligomer EA.PA showed improved thermal degradation stability and high glass transition temperature. The lap shear adhesion test showed positive effect of oligomer EA.PA and PA.BA.GMA with an adhesion strength of up to 1.2 MPa. TheRIvalue of the composition containing PA.BA.GMA and oligomer EA.PA was measured as 1.55 which is qualified for the most applications in optoelectronic. The improvement inRIvalue may be well attributed to the presence of aromatic rings in the polymer chain backbone. The high degree of aromaticity is in favor with the improved thermal stability in adhesive composition.
Funding Information
  • Iran Polymer and Petrochemical Institute (35794111)

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