Synthesis and coating properties of sulfonated calixarene‐based waterborne polyurethane hydrotalcite nanocomposite

Abstract

In this article, sulfonated calixarene was used to modify Mg‐Al hydrotalcite (Mg‐Al‐LDH) prepared by coprecipitation method to improve the interfacial compatibility between nano‐hydrotalcite and waterborne polyurethane (WPU) matrix. Waterborne polyurethane hydrotalcite nanocomposite emulsion (STCR‐LDH/WPU) was prepared by adding modified hydrotalcite into WPU. The tensile strength, surface static contact angle, water permeability rate, and water absorption of the film were measured. FTIR and X‐ray diffraction were used to determine the film‐forming properties. The results showed that the tensile strength increased to 57 MPa, the elongation at break reached 292%, and its water vapor permeability and UV resistance were significantly improved by introducing sulfonated calixarene to modify the hydrotalcite nanosheet structure based on WPU. The compound emulsion gives the coated leather excellent physical and mechanical properties, and the laminated leather has stronger coating abrasion resistance.

High oxygen barrier property of polyethylene composite films with bilayer polyvinyl alcohol coating for emergency foods in high‐humidity environments

“…The characteristic peaks were observed at 2θ = 11.56 , 23.24 , 34.62 , 46.36 , 60.7 , and 62.0 that correspond to the crystal planes of (003), ( 006), ( 009), (012), (110), and (113), respectively. 29 The results were consistent with the previous study of Zhang et al 30 The morphology of Mg-Al LDH was examined by FESEM, as illustrated in Figure 2c,d, suggesting the characteristic hexagonal arrangement of Mg-Al LDH and a sleek surface and a layered configuration between the particles. 31 These results demonstrated that the Mg-Al LDH were successfully prepared.…”

Optimizing Green Synthesis of Hydrotalcite – Silver Nanoparticles using Syzygium Nervosum based Reducing Agent

“…[14] Because of this special structure, when applying HT to the AgNPs synthesis process, AgNPs will disperse and adhere to the surface of the HT layer to form HTÀ Ag combination with many great daily applications. [20][21][22] Moreover, when using the plant extracts as reducing agents, the Ag(I) ion reduction reaction usually occurs more easily in case of adjustment to the alkali environment. Thus, the alkali environment of HT also helps for Ag(I) ion reduction reaction in the case of using plant extracts without using pH-adjusting chemicals to become more favorable.…”