writer：L. L. Zhang, T. T. Lin, X. Y. Pan, W. Z. Wang,* T. X. Liu
keywords：Porous polymer nanospheres, Morphology, Gas absorption, Bioimaging
source：期刊
specific source：J. Mater. Chem. 2012, 22(19), 9861-9869.
Issue time：2012年

This paper reports the development of a simple and effective way to prepare novel soluble porous polymer nanospheres (PPSs) by A3B2 catalytic emulsion polymerization using a Suzuki reaction as a one-step, surfactant-free process. The PPSs chemical structures are characterized by Fourier transform infrared spectroscopy, transmission electron microscopy, powder X ray diffraction, dynamical light scattering, and thermogravimetric analysis. The results show that tris(4-bromophenyl) amine (A3) and benzene-1,4-diboronic acid (B2) monomers in a dilute Suzuki system (1 : 20 as the ratio of toluene to water) form a A3 core/B2 shell nano-size micelle in the oil/water template at the early stage. With the reaction processing, the
10 nm nanoparticles precipitate in droplets and move into the water phase. The small individual nanoparticles further aggregate and connect into
200 nm porous nanoparticles. The controlled second level of porosity is attributed to the uniform individual nanoparticles’ self-assembly. Its porosity is confirmed by N2 sorption isotherms at 77 K. Among the PPS series, PPS3 has a high surface area of 2180m2 g1 and adsorbs up to 2.08 wt% hydrogen by mass at 1.13 bar/77 K. Photoluminescence investigations have shown that PPS copolymers with different
concentrations of 4,7-dibromo-2,1,3-benzothiadiazole emit blue, green and yellow light, respectively. Preliminary investigations show that PPS displays a low cytotoxicity and can be used as a fluorescence marker in bioimaging.