Abstract
Waterborne polyurethane/acrylate hybrids with various ratios of acrylic monomers including: butyl acrylate, methyl methacrylate and acrylic acid were prepared using prepolymer route towards emulsion copolymerization. In the first step, after prepolymer synthesis, vinyl groups were incorporated into the prepolymer chain ends through reaction of OH groups of hydroxy ethyl methacrylate (HEMA) and NCO groups of diisocyanate. Next, the chain extension, neutralization and dispersion were carried out. In the second step, hybrids of waterborne polyurethane acrylate were synthesized by emulsion copolymerization of acrylate monomers with synthesized waterborne polyurethane. Different amounts of acrylate monomers were examined to obtain an optimum composition. The structural study and confirmation of the functional groups were performed using ATR-FTIR. The effects of acrylate monomers on thermal stability, mechanical properties, morphology, and particle size were investigated.
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