Hollow polyphosphazene microspheres with cross-linked chemical structure: synthesis, formation mechanism and applications

Abstract

Hollow poly(cyclotriphosphazene-co-4,4 0 -sulfonyldiphenol) (PZS) microspheres with cross-linked chemical structure have been prepared under mild conditions by using polystyrene (PS) microspheres as sacrificial templates, hexachlorocyclotriphosphazene (HCCP) and 4,4 0 -sulfonyldiphenol (BPS) as comonomers, and triethylamine (TEA) as acid-acceptor. A template-induced assembly mechanism has been proposed to explain the formation of the hollow PZS microspheres. The as-prepared PS@PZS composites and hollow PZS microspheres were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier transform infrared (FT-IR) spectrometry, thermogravimetric analysis (TGA), and elemental analysis. The shell thickness of the hollow PZS microspheres can be controlled by adjusting the feed ratio of sacrificial templates to comonomers. An application study for the hollow PZS microspheres as a support of Au nanoparticles was carried out. The results show that Au nanoparticles with a size of about 5-8 nm were uniformly attached to the surface of the hollow PZS microspheres and the hollow PZS/Au hybrids displayed good catalytic properties with the reduction of 4-nitrophenol to 4-aminophenol as the model catalysis reaction. Fig. 3 (a and b) SEM images and (c) TEM image of as-synthesized PS@PZS composites. (d) TEM image of the hollow PZS microspheres.This journal is

One-Pot Synthesis of Cyclomatrix-Type Polyphosphazene Microspheres and Their High Thermal Stability

“…C-PPZs at 200 °C showed excellent thermal stability, showing only 10% weight loss at 900 °C. Also, the improved thermal stability of the CPPZ microspheres compared with those of HCCP and p -PDA (Figure S2) is due to the formation of a highly cross-linked structure and the thermal stability of the cyclotriphosphazene rings …”

“…Also, the improved thermal stability of the CPPZ microspheres compared with those of HCCP and p-PDA (Figure S2) is due to the formation of a highly crosslinked structure and the thermal stability of the cyclotriphosphazene rings. 27 The phase structure of the C-PPZ microspheres was analyzed using powder X-ray diffraction (XRD), as shown in Figure 2b. Two broad diffraction peaks at 2θ values of around 12 and 26°were observed, which confirms the amorphous structure of the PZS microspheres without any crystallization.…”

Amino-rich polymer-coated Fe–Fe2O3 nanoparticles with high adsorption capacity and rapid magnetic separation for anionic dye removal

“…Besides, the strong peak at 3434 cm −1 is assigned to the rich amino and imino groups [26]. Of note, the disappearance of P-Cl bond, the presence of P=N bond at 1180 cm −1 and the generation of new peak at 1109 cm −1 assigned to the P-N-C band in FTIR spectrum of magnetic Fe-Fe 2 O 3 @PCP indicated the occurrence of chemical reaction between HCCP and PEI [38][39][40]. Figure 2e shows the typical hysteresis loops of the magnetic Fe-Fe 2 O 3 @PCP composite.…”

Fabrication of three‐dimensional porous superhydrophobic composites for immiscible and emulsified oil/water mixture separation

“…Compared with the HCCP and BPS spectra, the new peaks at 941 cm À1 indicate polymerization between comonomers HCCP and BPS to form PZS nanospheres (Figure 2A). [34] Figure 2B shows SEM images of as-synthesized PZS nanospheres, indicating the regular spherical shape of the nanospheres with a diameter range of 300-600 nm. The EDS results show the presence of P and S atoms (Figure 2C).…”