Preparation, Characterization and Performance Properties of Polydodecylmethylsilsesquioxane Nanoparticles

Abstract

A series of polydodecylmethylsilsesquioxane (PDMSQ) nanocomposite latexes were prepared via emulsion polymerization of methyltriethoxysilane (MTES) and dodecyltrimethoxysilane (DTMS) and sodium hydroxide as the catalyst, and sodium dodecyl benzene sulfonate/Tween 80 as the mixed emulsifiers. Effects of the emulsifier doses, the reaction temperature, the catalyst concentration and the oil/water ratio on the particle size and distribution of the PDMSQ nanoparticles were discussed. Particle size and micromorphology, structure, thermal stability, crystallinity and hydrophobicity of PDMSQ nanoparticles (PDMSQ NPs) were investigated by dynamic laser scattering (DLS), Fourier transform infrared spectroscopy (FTIR), silicon-nuclear magnetic resonance (28Si-NMR), X-ray photoelectron spectroscope (XPS), scanning electron microscope (SEM), transmission electron microscope (TEM), atomic force microscope (AFM), thermo gravimetric analysis (TGA), X-ray diffraction (XRD) and contact angle tester. Results showed that a series of PDMSQ NPs could be obtained with an average particle size of less than 80 nm and narrow distribution as well as spherical structure under the optimal process conditions. PDMSQ NPs exhibited excellent thermal stability and were mainly amorphous but also contained some crystal structures. Importantly, the static water contact angles (WCAs) on its latex films were larger than 150° and the WCAs hysteresis were less than 10°, thus those PDMSQ nanocomposite latexes show potential in the field of superhydrophobic coatings.

Simple and controllable synthesis of benzocyclobutene‐functionalized polysiloxane microspheres for low dielectric material: From nanometer to micron

“…Studies have shown that the position of the first maximum corresponds to interval of long‐range ordering within the material, that is, the first peak corresponds to the size of the ring structure (cage and ladder) 29 . The ratio of heights of the sharp peak (at 5.85°) and the wide peak (at about 20°) can be used as a measure of overall regularity of the structure 37,38 . As can be seen from Figure 4b, this ratio is larger in BPMS (about 1.33) than in BPNS (about 0.98), indicating that the skeleton structure of BPMS is more regular, which is also the reason for the larger interval between its bimodal peaks in the infrared spectrum.…”

“…29 The ratio of heights of the sharp peak (at 5.85 ) and the wide peak (at about 20 ) can be used as a measure of overall regularity of the structure. 37,38 As can be seen from Figure 4b, this ratio is larger in BPMS (about 1.33) than in BPNS (about 0.98), indicating that the skeleton structure of BPMS is more regular, which is also the reason for the larger interval between its bimodal peaks in the infrared spectrum. At the same time, the regularity of BPMS-cured is higher than that of BPMS-uncured.…”