Monodispersed hybrid microparticles based on polyhedral oligomeric silsesquioxane with good UV resistance and high thermal stability: From organic to inorganic

Deng, Yiyi; Han, Di; Zhou, Dai‐Lin; Liu, Ziqi; Zhang, Qin; Li, Yiwen; Fu, Qiang

doi:10.1016/j.polymer.2019.121609

Cited by 25 publications

(19 citation statements)

References 48 publications

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“…POSS is represented by the unique formula (RSiO 3/2 ) n , where n is the number of the silicon atoms of the cage (1-3 nm in size) surrounded by organic corner groups (R). Due to its inorganic Si-O core cage structure and optional organic group chains, POSS can enhance matrix properties, such as mechanical strength [15][16][17], thermal stability [18][19][20] and oxidation resistance [21][22][23], and it can maintain good compatibility with the matrix in micro or nano scales. Meanwhile, POSS used in dental restoration can significantly improve the matrix on marginal adaptation [24,25] and ensure good biocompatibility and comfort level [4,26], which can greatly reduce the risk of micro effusion and secondary caries.…”

Section: Introductionmentioning

confidence: 99%

Study of POSS on the Properties of Novel Inorganic Dental Composite Resin

Wang

Liu

et al. 2020

Polymers

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Various amounts of methacryl polyhedral oligomeric silsesquioxane (POSS) were explored to be incorporated into novel nano SiO2 dental resin composites using light curing method. The scanning electron microscopy (SEM), optical microscopy, fourier transform infrared spectroscopy (FTIR), nanoindentation, nanoscratch and three-point flexure tests were performed. The volumetric shrinkage and mechanical properties such as hardness, elastic modulus, resistance, flexural strength and fracture energy were analyzed. With the additions of POSS, the volume shrinkage decreased and the mechanical properties initially increased. The effects of POSS on these properties were studied to provide a reference for clinically selecting a composite resin with excellent properties.

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Section: Introductionmentioning

confidence: 99%

Study of POSS on the Properties of Novel Inorganic Dental Composite Resin

Wang

Liu

et al. 2020

Polymers

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“…A typical chemical formula of POSS is (SiO 1.5 R) n ( n = 8, 10, 12), which comprises a rigid inorganic siloxane cage (Si 8 O 12 ) and multiple designable organic substituents (R 8 ). , The inorganic siloxane cage can afford thermal stability and mechanical strength, while the organic substituents provide compatibility and reactivity with polymers. − In the past two decades, POSS have been widely used as nanofillers for enhancing the thermal and mechanical properties of polymers. − As a nanosized cagelike structure, very recently, POSS have also been regarded as a nanobuilding block for the construction of hybrid porous materials. − The resultant hybrid materials inherit the inherent chemical and physical properties of POSS, and they exhibit large surface area, narrow pore-size distribution, good chemical resistance, and high thermal stability, showing attractive application prospects in adsorption, catalysis, energy storage, etc. Notably, such porous materials mainly contain inorganic silica cages and organic linkers, and they are good precursors for the fabrication of carbon and silica materials with a porous nanostructure through selectively removing the silica phase via chemical etching and the organic phase via thermal pyrolysis. ,, …”

Section: Introductionmentioning

confidence: 99%

Facile Construction of Porous Magnetic Nanoparticles from Ferrocene-Functionalized Polyhedral Oligomeric Silsesquioxane-Containing Microparticles for Dye Adsorption

Han

Liu

Zhou

et al. 2020

Ind. Eng. Chem. Res.

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Previously, much attention has been paid to prepare porous magnetic silica micro/nanoparticles, but most of the reported methods are limited by sophisticated procedures and strict synthetic conditions. Herein, we established a facile approach to prepare porous Fe3O4@SiO2 composite nanoparticles through thermal calcination of ferrocene-functionalized polyhedral oligomeric silsesquioxane-containing microparticles (Fc-PCMs). The key point of this approach is utilizing a nanosized, cagelike POSS molecule as the porogen and ferrocene as the magnetic source to simplify the preparation procedures. Taking advantages of the thiol-Michael dispersion polymerization technique, Fc-PCM precursors with tunable ferrocene were rapidly synthesized under ambient conditions, and the subsequent thermal calcination process imparted magnetic properties and a porous nanostructure to them simultaneously. The precursors and ultimate particles were characterized by various techniques. It was found that the saturation magnetization and surface area of these particles were affected by the calcination temperature, and the optimal condition was 600 °C. The ultimate particles exhibited a large surface area (i.e., 655.3 m2 g–1), nanopores (pore size was around 1.9 nm), good magnetic properties (a saturation magnetization of 8.5 emu g–1), and nanoscale spherical morphology (average diameter around 600–700 nm). Besides, the formed Fe3O4 nanocrystals were well dispersed in the large SiO2 particles, and their superparamagnetic property was measured. The above features made these porous Fe3O4@SiO2 composite nanoparticles attractive candidates for adsorption and catalysis. We selected an organic dye, methylene blue, as a model adsorbate to investigate their adsorption performance, and adsorption experiments suggested their large adsorption capacity, easy magnetic separation, and good recyclability performance. This work not only provides a facile way for the fabrication of porous magnetic silica particles but also affords a platform to prepare other functional particles based on POSS.

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“…Functional polymeric microparticles have attracted considerable interest over the past few decades for their wide applications, − including biological detection, environmental monitoring, etc. − Among them, rough particles such as raspberry- or cauliflower-like particles and other nonspherical particles such as dumbbell-like or multiple compartment particles are desirable to their applications. Generally, these particles are acquired efficiently by radical-mediated chain-growth polymerizations in heterogeneous systems in which seeds are used or phase separations occur. − Recently, many attempts have been done to synthesize polymeric microparticles based on step-growth click polymerizations in heterogeneous systems, including thiol-ene/thiol-yne suspension, − emulsion, miniemulsion, ,− precipitation and dispersion polymerizations, ,− or thiol-epoxy/thiol-isocyanate dispersion polymerization (Dis.P). , Thiol-X click reactions have some prominent advantages, such as mild conditions of reaction, easy manipulation of the polymer backbone structure, facile functionalization, etc. The residual reactive groups on particles enable the ligation of fluorescent dyes to the surface, , change of surface wettability, formation of a surface pattern, etc.…”

Section: Introductionmentioning

confidence: 99%

Anomalously Shaped Functional Particles Prepared by Thiol-Isocyanate Off-Stoichiometric Click Dispersion Polymerization

et al. 2020

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Anomalously shaped microparticles have attractive advantages in applications. They are usually prepared by chaingrowth polymerizations in heterogeneous systems. Recently, thiol-X step-growth polymerizations have been used to produce functional particles with a regular shape but rarely anomalous shapes. Herein, we report the preparation of anomalously shaped particles by thiol-isocyanate dispersion polymerization (Dis.P) in ethanol using polyvinylpyrrolidone (PVP) as a stabilizer and catalyst. Papillae-shaped, raspberry-like, and multibulged particles are prepared by tuning monomer combinations, contents, and feed ratios. Particle morphology evolutions during polymerization are observed by scanning electron microscopy (SEM). Distinct from previous works, particles with residual −SH groups are obtained even with equal moles of monomers added initially. The residue of −SH groups is revealed by Fourier transform infrared spectroscopy (FT-IR) analyses and confirmed by detection with a fluorescent probe containing disulfide linkage. Moreover, fluorescent particle probes are formed by the reaction of excess −NCO groups on particles with fluorescein isothiocyanate isomer I (FITC) and dithioacetal-functionalized perylenediimide (DTPDI). The probes are sensitive in detection of glutathione (GSH) and Hg 2+ in water. Hg 2+ as low as 1−0.1 ppb is detected using a raspberry-like particle probe with DTPDI.

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Monodispersed hybrid microparticles based on polyhedral oligomeric silsesquioxane with good UV resistance and high thermal stability: From organic to inorganic

Cited by 25 publications

References 48 publications

Study of POSS on the Properties of Novel Inorganic Dental Composite Resin

Study of POSS on the Properties of Novel Inorganic Dental Composite Resin

Facile Construction of Porous Magnetic Nanoparticles from Ferrocene-Functionalized Polyhedral Oligomeric Silsesquioxane-Containing Microparticles for Dye Adsorption

Anomalously Shaped Functional Particles Prepared by Thiol-Isocyanate Off-Stoichiometric Click Dispersion Polymerization

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