In Situ Formation of Silica Nanoparticles Decorated with Well-Defined Homopolymers and Block Copolymers
نویسندگان
چکیده
Grafting non-polar polymer chains on the surface of polar nanoparticles (e.g., silica) is an effective way to enhance particle/matrix interactions and thus promote their homogeneous dispersion within a matrix, which leads improved mechanical properties. Current grafting methods have not yet produced with well-defined polymers high density. Here, we employed anionic polymerization vacuum techniques synthesize ω-triethoxysilyl polystyrene (PS-TEOS) PS-b-PI macromonomers followed by hydrolysis/condensation macromonomers, leading in situ formation grafted (grafting through) silica either PS or polystyrene-b-polyisoprene (PS-b-PI) chains. The molecular characteristics precursors PS-TEOS PS-b-PI-TEOS were determined proton nuclear magnetic resonance, size exclusion chromatography, matrix-assisted laser desorption/ionization time-of-flight. (PS@SiO2 NPs) (PS-b-PI@SiO2 was verified Fourier transform infrared spectroscopy, 29Si solid-state NMR, transmission electron microscopy, thermogravimetric analysis, dynamic light scattering. Blends PS@SiO2 commercially available PS-b-PI@SiO2 anionically synthesized thermoplastic elastomer (PS-b-PI-b-PS) obtained melt extrusion solution evaporation. role polymer@SiO2 properties morphological features matrices examined tensile testing scanning microscopy. proposed general method controls weight, chemical composition, particle size, density effectively improves two families PS-based nanocomposites.
منابع مشابه
Dispersion of polymer-grafted magnetic nanoparticles in homopolymers and block copolymers
The dispersion of magnetic nanoparticles (NPs) in homopolymer poly(methyl methacrylate) (PMMA) and block copolymer poly(styrene-b-methyl methacrylate) (PS-b-PMMA) films is investigated by TEM and AFM. The magnetite (Fe3O4) NPs are grafted with PMMA brushes with molecular weights from M = 2.7 to 35.7 kg/mol. Whereas a uniform dispersion of NPs with the longest brush is obtained in a PMMA matrix ...
متن کاملSynthesis of well-defined polymers grafted onto fumed silica by chain exchange reaction and highly pure block copolymers thereby.
Radical-induced addition-fragmentation processes were efficiently used for surface modification of fumed silica, and Z-supported solid CTAs could be reused in presence of excess sacrificial thermal initiator.
متن کاملAmbient-temperature living anionic polymerization of phosphaalkenes: homopolymers and block copolymers with controlled chain lengths.
متن کامل
PEGylation of gold-decorated silica nanoparticles in the aerosol phase.
Coating of gold-decorated silica nanoparticles with polyethylene glycol (PEG) was carried out in the aerosol phase. The process involves first functionalizing the nanoparticles at ~225 ° C with a bifunctional reactant, 2-mercaptoethanol (ME), for which one end is a thiol that attaches to the gold surface and the other end is a terminal hydroxyl group, and then introducing ethylene oxide (EO), w...
متن کاملsimulation and experimental studies for prediction mineral scale formation in oil field during mixing of injection and formation water
abstract: mineral scaling in oil and gas production equipment is one of the most important problem that occurs while water injection and it has been recognized to be a major operational problem. the incompatibility between injected and formation waters may result in inorganic scale precipitation in the equipment and reservoir and then reduction of oil production rate and water injection rate. ...
ذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: ACS applied polymer materials
سال: 2023
ISSN: ['2637-6105']
DOI: https://doi.org/10.1021/acsapm.3c00440