Stimuli-Responsive Nanolatexes for Superpriming and Improved Durability

摘要

A new class of ultrastable latexes based on copolymers of reactive ionic liquid surfactants is synthesized and characterized by various methods. These latexes are produced by microemulsion polymerization to yield ultrastable dispersions of nanometer length scale particles. Aqueous coating of these latexes dry to form robust films that exhibit elastic thermomechanical properties typical of rubbers. The nature of the reactive ionic liquid surfactant monomers induces an ion exchange capacity in the resulting copolymers. Transparent films of such latexes can be reversibly transformed into opaque and porous films by simple ion exchange treatments (washes) and by solvent treatments. Taking advantage of these characteristics, superprimers have been prepared which exhibit excellent substrate and top coat adhesion for waterborne as well as solvent borne top coats. High adhesion is obtained from the electrostatic nature of the copolymeric backbone and from the variable porosity that can be induced for particular applications. When used as conventional waterborne binders, these nanolatexes provide enhanded durability.