Mesoporous silica particles grafted with poly(ethyleneoxide-block-N-vinylcaprolactam)
| Autor: | Lotta Bergman, Heikki Tenhu, Jason R. McKee, Sami Hietala, Erno Karjalainen, Mika Lindén, Mikko Karesoja |
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| Rok vydání: | 2013 |
| Předmět: |
USES (Uses) (block
Polymers and Plastics Nanoparticle Dispersion of materials 02 engineering and technology 01 natural sciences poly PREP (Preparation) ethyleneoxide Materials Chemistry Zeta potential Polymerization (atom transfer grafted PRP (Properties) Click chemistry Atom-transfer radical-polymerization Polyoxyalkylenes Role: RCT (Reactant) SPN (Synthetic preparation) Polymer chains RCT (Reactant) [Polyoxyalkylenes Role] 021001 nanoscience & nanotechnology Particles silica Polymer brushes diblock 0210 nano-technology particle Materials science Polymer morphology (phase Phase transition enthalpy Phase separation RACT (Reactant or reagent) (mesoporous silica particles grafted with poly(ethyleneoxide-block-N-vinylcaprolactam)) 010402 general chemistry Lower critical solution temperature Dynamic light scattering Polymer chemistry vinyl Zeta potential (mesoporous silica particles grafted with poly(ethyleneoxide-block-N-vinylcaprolactam)) radical Polyoxyalkylenes Role: POF (Polymer in formulation) Organic Chemistry surface initiated Mesoporous silica Mesoporous materials caprolactam 0104 chemical sciences POF (Polymer in formulation) [Polyoxyalkylenes Role] Polymerization mesoporous silica particles grafted with poly(ethyleneoxide-block-N-vinylcaprolactam)) Particle mesoporous Particle shape |
| Zdroj: | Karesoja, M, McKee, J, Karjalainen, E, Hietala, S, Bergman, L, Linden, M & Tenhu, H 2013, ' Mesoporous silica particles grafted with poly(ethyleneoxide-block-N-vinylcaprolactam). ', Journal of Polymer Science, Part A: Polymer Chemistry, vol. 51, no. 23, pp. 5012-5020 . https://doi.org/10.1002/pola.26928 |
| ISSN: | 0887-624X |
| DOI: | 10.1002/pola.26928 |
| Popis: | Mesoporous silica particles were grafted with thermoresponsive poly(ethyleneoxide-b-N-vinylcaprolactam), PEO-b-PVCL. N-vinylcaprolactam was first polymerized on particle surfaces using surface initiated atom transfer radical polymerization (SI-ATRP) and then, the poly(ethyleneoxide) blocks were attached to the PVCL chain ends with click chemistry. The sizes, thermoresponsiviness, and colloidal stability of SiO2-PVCL and SiO2-PVCL-b-PEO particles and their aqueous dispersions were studied by scanning electron microscopy, turbidimetry, dynamic light scattering, zeta sizer, and microcalorimetry. The phase separation temperature of the PEO-b-PVCL grafted particles did not considerably differ from that of the SiO2-PVCL particles. The zeta potential of the grafted particles was close to zero at room temperature but decreased strongly upon heating. The decrease is related to the collapse of the PVCL blocks and correspondingly, the exposure of the silica surface toward the aqueous phase. The colloidal stability of the particles could be enhanced by adding PEO blocks to the chain ends of the PVCL grafts. © 2013 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2013, 51, 5012–5020 |
| Databáze: | OpenAIRE |
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