Polyurethane/Acrylic Hybrid Waterborne Dispersions: Synthesis, Properties and Applications

Abstract

Polyurethane (PU)/acrylic hybrid dispersions are an important class of polymeric dispersions that are produced on an industrial scale. In this review, we detail the design and synthesis of PU/acrylic dispersions, with a particular focus on how the structure of the hybrid can be tuned toward commercial applications. After a brief introduction, we describe the building blocks used in each polymer and their role in the synthesis/application of the final dispersion. Subsequently, we discuss the range of procedures that have been developed for the synthesis of such hybrids and how the structure of the hybrids influences the physical properties of films cast from the dispersion. Finally, we highlight commercial applications of PU/acrylic hybrids, with a focus on potential future developments.

Application of blocked isocyanate in preparation of polyurethane(urea) elastomers

“…For commercial CPU, it is difficult to reconcile high strength and toughness at the same time. 69,70 In this paper, a kind of polyurethane with high strength, high elongation at break and low damping was successfully synthesized by the method of blocked prepolymer and simple pouring process. The existence of intermolecular hydrogen bonds was confirmed by FTIR, and the formation of crystallization was confirmed by XRD.…”

Water-based non-isocyanate polyurethane-ureas (NIPUUs)

“…PUs are usually synthesized through the so-called acetone process -Scheme 7. 15,59 In this process, the PU prepolymers are synthesized in a water miscible low boiling point solvent, commonly acetone. An internal dispersing agent such as dimethylolpropionic acid (DMPA) is usually added into the formulation and allows for dispersion in the water phase upon neutralization (usually performed with the help of trimethylamine).…”

“…14 Variations of the type and proportion of the diisocyanate, polydiol and chain extender allow achieving widely different properties, which is the main reason for the broad range of applications of the PUs. The range of properties can be further extended by hybrids of PUs with other materials such as other polymers, 15 graphene, 16 cellulose nanocrystals, 17 clays 18 and carbon nanotubes. 19 Circular economy and the need to decrease the dependency from oil are fostering the search for bio-based sources for polyurethanes.…”

Water‐based polyurethanes for sustainable advanced manufacture

“…In literature, there are reviews of water‐based PU focusing mainly on the synthesis, chemistry, types, properties, and applications in traditional fields such as coatings and adhesives, and reviews of the fabrication and properties of water‐based PU nanocomposites. [ 1,6–11 ] Complementary to these prior works, this paper reviews water‐based PU particularly on its colloidal properties, advanced printing manufacture, and emerging applications in soft electronics. It is organized into three sections: first, we provide an overview of the fundamentals of water‐based PU including molecular forces and segmentation, chemistry, depolymerization, and polymer colloidal dispersion; second, due to its unique colloidal property, we review and discuss the printing process of water‐based PU composites; and third, we discuss the latest explorations of water‐based PU for emerging flexible and stretchable electronics.…”