Synthesis and properties of networking waterborne polyurethane/silica nanocomposites by addition of poly(ester amine) dendrimer

Abstract

The second‐generation poly(ester amine) dendrimer was prepared by Michael addition reaction and esterification reaction at first. Then, a series of novel waterborne polyurethane (WPU)‐based composites were prepared by the addition of poly(ester amine) dendrimer into the WPU. The structures and the morphology of the WPU composites were measured with Fourier transform infrared spectrometer, scanning electron microscopy, and X‐ray diffraction. SEM images revealed that the nanosilica was well dispersed in the WPU matrix. The mechanical properties of the WPU composites were improved with the addition of poly (ester amine) dendrimer. The dynamic mechanical thermal analysis results showed that the WPU composites had higher glass transition temperature than that of pure WPU, especially after incorporation of poly(ester amine) dendrimer. This conclusion is in good agreement with the differential scanning calorimetry results. The thermal properties of the pure WPU and its composites were investigated by thermogravimetric analysis. The results showed that the initial decompose temperature began from about 250°C, and had a little increase when introducing poly(ester amine) dendrimer into the WPU matrix. POLYM. COMPOS., 2012. © 2013 Society of Plastics Engineers

Analyzing the influence of different synthetic talcs in waterborne polyurethane nanocomposites obtainment

“…The nanocomposites do not break at the tests conditions. Hydrogen bonding interaction among fillers/WPU matrix, as evidenced in FTIR section, can be responsible for this behavior . Unlike the others samples the WPU nanocomposite with 3% w/w of synthetic talc D43001 as filler achieved higher values of Young Modulus and stress/strain when compared to 5 and 10% w/w (Figure S1).…”

Synthesis and characterization of hyperbranched waterborne polyurethane/Ag nanoparticle composites

“…The peaks at 1718.9 cm −1 (CO stretching vibration), 1128.1 cm −1 (CO symmetric stretching), and 1042.5 cm −1 (asymmetric stretching) were the characteristic absorption bands of polyester. From above analysis, it can be concluded that the different generation hyperbranched polyester were successfully synthesized .…”

Silica Nanostructures, a Heterogeneous Surface for Dendrimer Functionalization

“…This material caused to a considerable increase in the thermal stability of epoxy resin. Han synthesized a dendrimer binded silica nanosphere based composite with waterborne polyurethane (WPU) to improve the physical properties WPU. G2‐polyester amine dendrimer with divergent strategy was selected to bind to the silica surface through Michael addition and esterification.…”

“…This dendrimer based WPU composite had higher dynamic mechanical and thermal feature than pure WPU. Thermogravimetric analysis showed that this composite had higher stability and glass temperature (Figure ) …”