Abstract
Aqueous polyurethane/polytert-butylacrylate (PU/Pt-BA) hybrid dispersions were prepared by polymerizing tert-butyl acrylate monomers that were emulsified by the waterborne polyurethane dispersions. The waterborne polyurethane dispersions, which contained no volatile solvent, were prepared by the prepolymer mixing process. The structure characteristics and properties of the hybrid dispersions were studied. A particle sizer and a viscometer were used to examine the physical characteristics of the dispersions. A Fourier transform infrared spectrophotometer and a gel permeation chromatograph were used to examine the structure of the hybrid composites. The thermal and mechanical properties were examined by a dynamic mechanical analyzer, a thermogravimetric analyzer, and an abrasion resistance tester. When the amount of ionic PU emulsifiers maintains constant, the average particle diameter and viscosity of the PU/Pt-BA hybrid dispersion become larger as more t-BA monomer was added and polymerized. As compared to the pure PU and Pt-BA polymers, the shifting of two Tgs in the composite toward each other may imply the improved compatibility between PU and Pt-BA through the hybridization process used in this study. The Pt-BA enhances the thermal and abrasion resistances of the PU/Pt-BA composites.
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