Abstract
Anionic waterborne polyurethane (aWPU) is not compatible with graphene oxide (GO) due to the repulsive force acting on identical ionic charges. In this study, we fabricated cationic surfactant treated GO and cationic surfactant treated carbon nanotube (CNT) to increase the compatibility with aWPU. Cationic waterborne polyurethane (WPU) and nanocomposites thereof were also prepared. On the basis of the mechanical properties of the nanocomposites, glass transition temperature (Tg), and a stability test, it was found that the compatibility between WPU and a nanofiller (NF) was enhanced to a great extent when WPU and NF had opposite ionicity. The Tg and mechanical properties of WPU increased with the addition of NF, showed the maximum value and thereafter decreased with further addition. The effect of composition of ionic monomer in WPU was also investigated. As the composition of the ionic monomer increases, the concentration of NF for the maximum Tg and mechanical properties increases. This was attributed to the ionic association between the NF and WPU.
Highlights
Polyurethane (PU) has various applications including fibers, coatings, adhesives, and smart actuators [1,2,3]
waterborne polyurethane (WPU) is a colloidal dispersion of polyurethane in an aqueous medium
graphene oxide (GO) associated with one ionomeric segment as the content of the ionomeric segment with a further increase of the filler content
Summary
Polyurethane (PU) has various applications including fibers, coatings, adhesives, and smart actuators [1,2,3]. It can be prepared with tailor-made properties by using well-designed combinations of the monomeric materials [4]. PU/organic solvent mixtures have been widely used as coatings, adhesives, and ink. Due to growing environmental restrictions on volatile organic compounds, waterborne polyurethane (WPU) has received increasing attention in recent coating and adhesive industries. WPU is a binary colloidal system where PU is microdispersed in an aqueous medium. WPU can be a good alternative to the organic solvent-based PU binder
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