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Letteratura scientifica selezionata sul tema "Silica polymerization"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 11 febbraio 2022

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Articoli di riviste sul tema "Silica polymerization"

1

Cheah, Pohlee, Caitlin N. Bhikha, John H. O’Haver e Adam E. Smith. "Effect of Oxygen and Initiator Solubility on Admicellar Polymerization of Styrene on Silica Surfaces". International Journal of Polymer Science 2017 (2017): 1–7. http://dx.doi.org/10.1155/2017/6308603.

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Although admicellar polymerization has been termed the surface analog of emulsion polymerization, previous reports utilizing free radical-initiated admicellar polymerization relied on high levels of the free radical initiator when compared to emulsion polymerization, likely due to the presence of oxygen in the reported admicellar polymerization systems. Admicellar polymerizations of styrene on the surface of precipitated silica initiated by either a water-soluble or a water-insoluble initiator were studied to determine the effect of dissolved oxygen and free radical initiator solubility on the kinetics, yield, and molecular weight of the polymer formed. Results show that the presence of oxygen reduces the polymer yield and limits molecular weight. The solubility of the initiator also affected the polymer formed in the admicellar polymerization of styrene. While monomer conversions and polymer yield were similar, the molecular weights of polymerizations initiated by a water-soluble initiator were higher than comparable polymerizations initiated by a water-insoluble initiator.

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2

Zhang, Zhenghe, Pengcheng Zhang, Yong Wang e Weian Zhang. "Recent advances in organic–inorganic well-defined hybrid polymers using controlled living radical polymerization techniques". Polymer Chemistry 7, n. 24 (2016): 3950–76. http://dx.doi.org/10.1039/c6py00675b.

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Controlled living radical polymerizations, such as ATRP and RAFT polymerization, could be utilized for the preparation of well-defined organic–inorganic hybrid polymers based on POSS, PDMS, silica nanoparticles, graphene, CNTs and fullerene.

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3

Bailly, Bérangère, Anne-Carole Donnenwirth, Christèle Bartholome, Emmanuel Beyou e Elodie Bourgeat-Lami. "Silica-Polystyrene Nanocomposite Particles Synthesized by Nitroxide-Mediated Polymerization and Their Encapsulation through Miniemulsion Polymerization". Journal of Nanomaterials 2006 (2006): 1–10. http://dx.doi.org/10.1155/jnm/2006/76371.

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Polystyrene (PS) chains with molecular weights comprised between 8000 and 64000g⋅mol-1and narrow polydispersities were grown from the surface of silica nanoparticles (Aerosil A200 fumed silica and Stöber silica, resp.) through nitroxide-mediated polymerization (NMP). Alkoxyamine initiators based on N-tert-butyl-1-diethylphosphono-2,2-dimethylpropyl nitroxide (DEPN) and carrying a terminal functional group have been synthesized in situ and grafted to the silica surface. The resulting grafted alkoxyamines have been employed to initiate the growth of polystyrene chains from the inorganic surface. The maximum grafting density of the surface-tethered PS chains was estimated and seemed to be limited by initiator confinement at the interface. Then, the PS-grafted Stöber silica nanoparticles were entrapped inside latex particles via miniemulsion polymerization. Transmission electron microscopy indicated the successful formation of silica-polystyrene core-shell particles.

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4

YOSHITAKE, Hideaki. "Polymerization of Monodisperse Silica Particles". Hosokawa Powder Technology Foundation ANNUAL REPORT 22 (2014): 88–93. http://dx.doi.org/10.14356/hptf.12114.

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5

Li, Hua-Rong, Liming Che e Zheng-Hong Luo. "Modeling intraparticle transports during propylene polymerizations using supported metallocene and dual function metallocene as catalysts: Single particle model". Chemical Industry and Chemical Engineering Quarterly 20, n. 2 (2014): 249–60. http://dx.doi.org/10.2298/ciceq120722006l.

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Two improved multigrain models (MGMs) for preparing homopolypropylene and long chain branched polypropylene via propylene polymerization using silica-supported metallocene or dual function metallocene as catalysts are presented in this paper. The presented models are used to predict the intraparticle flow fields involved in the polymerizations. The simulation results show that the flow field distributions involve dare basically identical. The results also show that both the two polymerization processes have an initiation stage and the controlling step for them is reaction-diffusion-reaction with the polymerization proceeding. Furthermore, the simulation results show that the intra particle mass transfer resistance has significant effect on the polymerization but the heat transfer resistance can be ignored.

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Belelli, Patricia G., Marı́a L. Ferreira e Daniel E. Damiani. "Silica-supported metallocene for ethylene polymerization". Applied Catalysis A: General 228, n. 1-2 (marzo 2002): 189–202. http://dx.doi.org/10.1016/s0926-860x(01)00976-0.

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7

Chaimberg, Mark, Richard Parnas e Yoram Cohen. "Graft polymerization of polyvinylpyrrolidone onto silica". Journal of Applied Polymer Science 37, n. 10 (20 maggio 1989): 2921–31. http://dx.doi.org/10.1002/app.1989.070371011.

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8

Feuston, B. P., e S. H. Garofalini. "Onset of polymerization in silica sols". Chemical Physics Letters 170, n. 2-3 (luglio 1990): 264–70. http://dx.doi.org/10.1016/0009-2614(90)87126-c.

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9

Moraes, John, Kohji Ohno, Guillaume Gody, Thomas Maschmeyer e Sébastien Perrier. "The synthesis of well-defined poly(vinylbenzyl chloride)-grafted nanoparticles via RAFT polymerization". Beilstein Journal of Organic Chemistry 9 (25 giugno 2013): 1226–34. http://dx.doi.org/10.3762/bjoc.9.139.

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We describe the use of one of the most advanced radical polymerization techniques, the reversible addition fragmentation chain transfer (RAFT) process, to produce highly functional core–shell particles based on a silica core and a shell made of functional polymeric chains with very well controlled structure. The versatility of RAFT polymerization is illustrated by the control of the polymerization of vinylbenzyl chloride (VBC), a highly functional monomer, with the aim of designing silica core–poly(VBC) shell nanoparticles. Optimal conditions for the control of VBC polymerization by RAFT are first established, followed by the use of the “grafting from” method to yield polymeric brushes that form a well-defined shell surrounding the silica core. We obtain particles that are monodisperse in size, and we demonstrate that the exceptional control over their dimensions is achieved by careful tailoring the conditions of the radical polymerization.

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10

Stoiljkovic, Dragoslav, Branka Pilic, Misa Bulajic, Nebojsa Djurasovic e Nikolaj Ostrovskii. "The charge percolation mechanism and simulation of Ziegler-Natta polymerizations, Part VII: Effects of the distribution of chromium active centers on silica on the polymerization of ethylene". Journal of the Serbian Chemical Society 73, n. 1 (2008): 97–111. http://dx.doi.org/10.2298/jsc0801097s.

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The charge percolation mechanism (CPM) of olefin polymerization in the presence of transition metal compounds has been applied to explain the polymerization of ethylene by silica supported chromium oxide. In the previous work of this series, the fundamental issues and mechanism of this polymeri?zation were presented. In this work the compatibility of the CPM with the em?pirical findings is confirmed. The CPM has been applied to explain: the appea?rance of an induction period; the deactivation of active centers and the forma?tion of oligomers; the effects of chromium concentration on the silica surface, the silica surface discontinuity and the pore size of silica on polymerization and the formation of the structure of polyethylene. A mathematical model has been derived to explain the effects of the CrOx/SiO2 ratio on the productivity of Phil?lips catalysts in the polymerization of ethylene. The empirical findings have also been confirmed by computer simulations.

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Tesi sul tema "Silica polymerization"

1

Yang, Minghua. "Silica supported metallocene catalysts and olefin polymerization". Thesis, University of Manchester, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.488443.

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2

Constable, Andrew N. "Functionalization of silica micro-capillaries and silica nanoparticles via polymber brushes". Akron, OH : University of Akron, 2008. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=akron1221746490.

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Dissertation (Ph. D.)--University of Akron, Dept. of Polymer Science, 2008.
"December, 2008." Title from electronic dissertation title page (viewed 12/28/2008) Advisor, Roderic P. Quirk; Committee members, Scott Collins, Ali Dhinojwala, Li Jia, Mark D. Soucek; Department Chair, Ali Dhinojwala; Dean of the College, Stephen Z. D. Cheng; Dean of the Graduate School, George R. Newkome. Includes bibliographical references.

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3

Kaßner, Lysann, Kevin Nagel, R. E. Grützner, Marcus Korb, Tobias Rüffer, Heinrich Lang e Stefan Spange. "Polyamide 6/silica hybrid materials by a coupled polymerization reaction". Universitätsbibliothek Chemnitz, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-197628.

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Polyamide 6/SiO2 hybrid materials were produced by a coupled polymerization reaction of three monomeric components namely 1,1′,1′′,1′′′-silanetetrayltetrakis-(azepan-2-one) (Si(ε-CL)4), 6-aminocaproic acid (ε-ACA) and ε-caprolactam (ε-CL) within one process. Si(ε-CL)4 together with ε-ACA has been found suitable as a precursor monomer for the silica and PA6 components. The accurate adjustment of the molar ratio of both components, as well as the combination of the overall process for producing the polyamide 6/SiO2 hybrid material with the hydrolytic ring opening polymerization of ε-caprolactam is of great importance to achieve homogeneous products with a low extractable content. Water in comparison with ε-ACA has been found unsuitable as an oxygen source to produce uniformly distributed silica. The procedure was carried out in a commercial laboratory autoclave at 8 bar initial pressure. The molecular structure and morphology of the hybrid materials have been investigated by solid state 29Si and 13C NMR spectroscopy, DSC and FTIR spectroscopy and electron microscopy measurements
Dieser Beitrag ist aufgrund einer (DFG-geförderten) Allianz- bzw. Nationallizenz frei zugänglich

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4

堀内, 達郎, e Tatsuro HORIUCHI. "Effects of amide additives on polymerization of silica under acidic conditions". Elsevier, 1992. http://hdl.handle.net/2237/16357.

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McKittrick, Michael W. "Single-Site Olefin Polymerization Catalysts via the Molecular Design of Porous Silica". Diss., Georgia Institute of Technology, 2005. http://hdl.handle.net/1853/6871.

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The major goals of this work were to: develop a new methodology for the preparation of site-isolated catalytic sites on a silica surface, prepare the first truly single-site supported metallocene/CGC polymerization catalyst, and develop structure-reactivity relationships for these new systems. To synthesize these novel catalysts, the approach taken was to develop a protocol which allows for the synthesis of an aminosilica material with isolated, uniform amine sites. This patterned aminosilica was then used as a scaffold to support a constrained geometry catalyst. These functionalizations occurred at essentially a quantitative level, in stark contrast to previous literature reports. The patterned catalysts were evaluated in the polymerization of ethylene and compared to densely loaded literature materials. Overall, it was found the patterned materials were 5-10 times more active than traditional immobilized CGC catalysts. The patterned catalysts were also found to be effective catalysts for the copolymerization of norbornenes (including functionalized norbornenes) and ethylene, the first reported use of a tethered CGC for the production of ethylene-norbornene copolymers. The control materials were inactive in these polymerizations, providing further evidence that the patterning protocol allows for the synthesis of unique highly active, isolated catalytic sites. Various structural components of the immobilized CGC developed in this work were tested for their impact on catalyst synthesis and reactivity in ethylene polymerizations. The results showed the patterned materials in general behaved according to the trends seen in homogeneous CGC polymerizations. These results, while congruent with similar homogeneous CGC studies, are in direct conflict with previous work on supported CGCs reported in the literature. This discrepancy is likely the result of the difference between the isolated, possibly single-site patterned catalysts developed in the course of this work and the multi-sited catalysts prepared by traditional supporting protocols. This also further illustrates the difficulty in developing structure-reactivity relationships when ill-defined solid catalysts are used.

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Liu, Yi. "Mesoporous silica/polymer nanocomposites". Diss., Atlanta, Ga. : Georgia Institute of Technology, 2009. http://hdl.handle.net/1853/31739.

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Thesis (Ph.D)--Polymer, Textile and Fiber Engineering, Georgia Institute of Technology, 2010.
Committee Chair: Jacob. Karl; Committee Member: Griffin. Anselm; Committee Member: Tannenbaum. Rina; Committee Member: Thio. Yonathan S; Committee Member: Yao. Donggang. Part of the SMARTech Electronic Thesis and Dissertation Collection.

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7

Cheng, Xu. "The Use of Functionalized Zirconocenes as Precursors to Silica-Supported Zirconocene Olefin Polymerization Catalysts". Diss., Virginia Tech, 2001. http://hdl.handle.net/10919/30027.

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Deck and coworkers previously showed that Me3Si substituents adjacent to group 4 metallocene dichlorides (M = Ti, Zr, Hf) are converted to corresponding BrMe2Si groups using BBr3, and that these BrMe2Si substituents are highly reactive to nucleophilic reagents such as water. The high reactivity of the Si-Br bonds suggested that these substituents could react with hydroxyl groups on the surface of partially dehydroxylated silica, forming covalently immobilized metallocene catalysts. This dissertation concerns the synthesis of electrophile-functionalized zirconocene dihalide complexes and the use of functionalized zirconocene dihalides as precursors to silica-supported metallocene olefin polymerization catalysts. Our first objective was to extend the metallocene "functionalization" chemistry to obtain substituents bearing more than one electrophilic bond. The reactivities of Me3Sn and Ph2MeSi substituents were explored in detail. (Me3Sn)2C5H4 combined with CpZrCl3 in toluene to afford (h5-Me3Sn-C5H4)CpZrCl2 (A). Reactions of A with electrophiles (E-X = Cl2B-Cl, I-Cl, and I-I) afforded (ï ¨5-XMe2Sn-C5H4)CpZrCl2 (and E-Me) cleanly. The reaction of A with BBr3 afforded either (ï ¨5-BrMe2Sn-C5H4)CpZrBr2 (25 ï °C, 10 min) or (ï ¨5-Br2MeSn-C5H4)CpZrBr2 (25 ï °C, 15 h). Ph2MeSi-C5H4Li combined with ZrCl4â ¢2THF to afford (h5-Ph2MeSi-C5H4)2ZrCl2 (B). The reaction of B with BCl3 led to incomplete cleavage of the Ph-Si bonds, however treatment of B with BBr3 afforded (h5-Br2MeSi-C5H4)2ZrBr2 (C) efficiently. The Sn-X bonds of the stannylated metallocenes were however relatively unreactive toward water and were excluded as candidates precursors for supported metallocene catalysts. X-ray crystal structures of (h5-ClMe2Sn-C5H4)CpZrCl2â ¢Â½toluene, (h5-Br2MeSn-C5H4)CpZrBr2â ¢THF, B, and C were obtained. The functionalized metallocene C reacts with water to afford an oligosiloxane-supported zirconocene dibromide. Combinations of solution 1H NMR, solid state CPMAS 13C NMR, and solid state CPMAS 29Si NMR spectroscopy suggested a stereoregular structure in which the metallocene units have local Cs (meso) symmetry. Although only sparingly soluble, the oligomeric substance showed activity for homogeneous ethylene polymerization (toluene solution, MAO cocatalyst, Al:Zr = 5000, 50 ï °C) similar to Cp2ZrCl2. Supported metallocene olefin polymerization catalysts were prepared by combining a functionalized metallocene precursor (Cp2ZrBr2 bearing either BrMe2Si or Br2MeSi groups) and partially dehydroxylated silica. Ethylene polymerization activity of the resulting catalysts was examined as a function of the precursor structure (number of reactive "tethering" groups, one vs. two Si-Br bonds per tethering group) and the immobilization conditions (time, temperature, presence or absence of NEt3 promoter). The activities of the immobilized zirconocene catalysts decreased and the stabilities increased with increasing number of tethers. The immobilized catalyst prepared from (ï ¨5-Br2MeSi-C5H4)2ZrBr2, which is assumed to form two "double-tethers" to silica, was significantly more active than the catalyst prepared from [ï ¨5-1,3-(BrMe2Si)2C5H3]2ZrBr2, which is assumed to form four "single-tethers" to silica. Catalyst leaching was observed in all the immobilized zirconocene catalysts. The use of NEt3 in the immobilization reaction enabled more metallocene to be supported, but the resulting activity was lower. The dissertation also includes model studies on the immobilization reaction and the stability of the Si-O-Si bonds. The reaction of C with tBuMe2SiOH results in the formation of Si-O-Si bonds; addition of NEt3 results in further reaction to afford Si-O-Zr bonds. The reaction of Reaction of Me3Si-O-SiMe3 with MAO showed that Si-O-Si bonds can be cleaved under the conditions of our polymerization reactions.
Ph. D.

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Qiao, Xiaoguang. "Synthesis of silica-polymer hybrid particles via controlled radical polymerization in aqueous dispersed media". Thesis, Lyon 1, 2013. http://www.theses.fr/2013LYO10332/document.

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Des polymères à base de méthacrylate de poly(oxyde d'éthylène) (PEOMA) avec des chaînes pendantes PEO (Mn = 300 ou 950 g mol-1) ou des copolymères de PEOMA300 et d'acide méthacrylique (AMA) ont été synthétisés par polymérisation radicalaire contrôlée par les nitroxydes en utilisant une alkoxyamine (BlocBuilder®) comme amorceur en présence de SG1 et d'une faible quantité de styrène. Les copolymères à base de PEOMA300 et d'AMA sont thermo- et pH-sensibles. Les deux types de macroalkoxyamines ont été utilisés pour amorcer la copolymérisation en émulsion du méthacrylate de n-butyle et du styrène et former, par auto-assemblage induit par la polymérisation, des particules composées de copolymères à blocs amphiphiles, en absence ou présence de particules de silice. En absence de silice, des particules stabilisées de façon stérique ou électrostérique ont été formées. La polymérisation présente les caractéristiques d'une polymérisation contrôlée avec néanmoins la formation d'une faible proportion de chaînes mortes. L'effet du pH, de la force ionique et de la nature ou de la concentration des macroalkoxyamines sur la cinétique de polymérisation et la morphologie des particules a été étudié, et des sphères, des vésicules ou des nanofibres ont été obtenues. Les macroalkoxyamines à base de PEO s'adsorbent sur la silice via la formation de liaisons hydrogène entre les chaînes PEO et les groupes silanol. La synthèse de copolymères à blocs en surface de la silice a conduit à la formation de particules hybrides de différentes morphologies (bonhomme de neige, multipodes, framboise, coeur-écorce, têtard, mille pattes) liées à la taille de la silice, au pH et à la nature du macroamorceur
Water-soluble brush-type polymers composed of poly(ethylene)oxide methacrylate (PEOMA) units with PEO side groups of various chain lengths (Mn = 300 and 950 g mol-1) or of PEOMA300 with methacrylic acid (MAA) were synthesized by nitroxide-mediated polymerization using an alkoxyamine initiator (BlocBuilder®) and SG1 nitroxide in the presence of a low amount of styrene. The PEOMA300-MAA based copolymers showed a dual temperature/pH response. The two series of macroalkoxyamines were used in aqueous emulsion copolymerization of nbutyl methacrylate and styrene leading to the formation of particles composed of amphiphilic block copolymers through polymerization-induced self-assembly, in both the absence and presence of silica. The experiments performed in the absence of silica particles resulted in the formation of sterically or electrosterically stabilized latexes. The polymerization exhibited all the features of a controlled system with however the presence of a small proportion of dead chains. The effect of pH value, ionic strength and type and concentration of the macroalkoxyamine initiator on polymerization kinetics and latex morphologies was investigated. Depending on the reaction conditions, spherical particles, vesicles or nanofibers were successfully prepared. The PEO-based macroalkoxyamines were shown to adsorb on the silica surface via hydrogen bond interaction between PEO and the silanol groups. This enabled block copolymers to be generated in situ on the silica surface leading to hybrid particles with snowman, raspberry, daisy, core-shell, “tadpole-” and “centipede-” like morphologies depending on the silica particle size, pH value and type of macroinitiator

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9

Fu, Anqiu. "Effect of the silica support on the reactivity and polymerization activity of organochromium complexes". Thesis, University of Ottawa (Canada), 2002. http://hdl.handle.net/10393/6159.

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The effect of the support in heterogeneous catalysis is very important but often poorly understood. The reaction of tetraneopentylchromium(IV) with Sylopol 952, a silica gel used industrially as a carrier for alpha-olefin polymerization catalysts, has been investigated and compared with the previously reported reaction on Aerosil 200, a fumed silica often used to model catalyst supports. Grafting, thermolysis, and metathetical exchange reactions of chromium(IV) neopentylidenes were found to be the same on either Aerosil 200 or Sylopol 952. However, reactivity of the grafted organochromium fragments towards ethylene was found to be quite different on the two supports. The research described in this thesis also explores the polymerization activity of bis(neopentyl)chromium(IV) fragments at higher ethylene pressures than were previously investigated. This result has greatly altered thinking about the nature of the active site for olefin polymerization over surface organochromium fragments. The supported bis(neopentyl)chromium(IV) is no longer believed to require thermal activation to create chromium alkylidene active sites. A possible mechanism is postulated. Propylene polymerization by the Aerosil-supported chromium alkylidene was observed as a slow pseudo-first-order reaction. The kinetics were examined at the gas-solid interface by in situ FTIR spectroscopy and the second-order rate constant compared to those previously measured for ethylene and 1-hexene.

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Hicks, Jason Christopher. "Organic/inorganic hybrid amine and sulfonic acid tethered silica materials synthesis, characterization and application /". Diss., Atlanta, Ga. : Georgia Institute of Technology, 2007. http://hdl.handle.net/1853/26583.

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Thesis (Ph.D)--Chemical Engineering, Georgia Institute of Technology, 2008.
Committee Chair: Jones, Christopher; Committee Member: Koros, William; Committee Member: Lyon, Andrew; Committee Member: Nair, Sankar; Committee Member: Weck, Marcus. Part of the SMARTech Electronic Thesis and Dissertation Collection.

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Libri sul tema "Silica polymerization"

1

Zirkzee, Hendricus Franciscus. A novel approcah to the encapsulation of silica particles: Mechanisims and kinetics. Eindhoven: Technische Universiteit Eindhoven, 1997.

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Brewer, Nicholas Jason. The influence of preparing silica supported catalysts in various solvents on the rate of polymerization. Manchester: UMIST, 1998.

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United States. National Aeronautics and Space Administration., a cura di. Polysiloxanes derived from the controlled hydrolysis of tetraethoxysilane as precursors to silica for use in ceramic processing. [Washington, D.C: National Aeronautcs and Space Administration, 1990.

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1942-, Kricheldorf Hans Rytger, e Burger C, a cura di. Silicon in polymer synthesis. Berlin: Springer, 1996.

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T, Bhatt Ramakrishna, e United States. National Aeronautics and Space Administration., a cura di. The effect of polymer char on nitridation kinetics of silicon. [Washington, DC]: National Aeronautics and Space Administration, 1994.

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T, Bhatt Ramakrishna, e United States. National Aeronautics and Space Administration., a cura di. The effect of polymer char on nitridation kinetics of silicon. [Washington, DC]: National Aeronautics and Space Administration, 1994.

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Capitoli di libri sul tema "Silica polymerization"

1

Ebeling, Bastian. "Nanocomposites via Polymerization from Silica". In Springer Theses, 199–213. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-15245-5_7.

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Blitz, Jonathan P. "Model Silica Supported Olefin Polymerization Catalysts". In New Advances in Polyolefins, 1–14. Boston, MA: Springer US, 1993. http://dx.doi.org/10.1007/978-1-4615-2992-7_1.

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Liu, Zhen, e Boping Liu. "Computational Studies of Chromium/Silica Catalysts". In Handbook of Transition Metal Polymerization Catalysts, 131–60. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2018. http://dx.doi.org/10.1002/9781119242277.ch5.

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Pullukat, Thomas J., e Robert E. Patterson. "Porous Silica in Transition Metal Polymerization Catalysts". In Handbook of Transition Metal Polymerization Catalysts, 31–55. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2018. http://dx.doi.org/10.1002/9781119242277.ch2.

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Pullukat, Thomas J., e Robert E. Patterson. "Porous Silica in Transition Metal Polymerization Catalysts". In Handbook of Transition Metal Polymerization Catalysts, 29–52. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2010. http://dx.doi.org/10.1002/9780470504437.ch2.

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Cheng, Ruihua, Zhen Liu, Lei Zhong, Xuelian He, Pengyuan Qiu, Minoru Terano, Moris S. Eisen, Susannah L. Scott e Boping Liu. "Phillips Cr/Silica Catalyst for Ethylene Polymerization". In Polyolefins: 50 years after Ziegler and Natta I, 135–202. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/12_2013_222.

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Cann, Kevin. "Silica-Supported Silyl Chromate-Based Ethylene Polymerization Catalysts". In Handbook of Transition Metal Polymerization Catalysts, 447–57. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2010. http://dx.doi.org/10.1002/9780470504437.ch11.

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Cann, Kevin. "Silica-Supported Silyl Chromate-Based Ethylene Polymerization Catalysts". In Handbook of Transition Metal Polymerization Catalysts, 573–89. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2018. http://dx.doi.org/10.1002/9781119242277.ch14.

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Hardcastle, Franklin D., Jih-Mirn Jehng, Chung-Ku Chen e Israel E. Wachs. "Raman Spectroscopy of Surface Rhenium Oxide on Alumina, Silica, Titania, Niobia, and Magnesia". In Olefin Metathesis and Polymerization Catalysts, 543. Dordrecht: Springer Netherlands, 1990. http://dx.doi.org/10.1007/978-94-011-3328-9_24.

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Tait, Peter J. T., e Johannes A. M. Awudza. "Prepolymerization and Copolymerization Studies Using Homogeneous and Silica-supported Cp2ZrCI2/MAO Catalyst Systems". In Organometallic Catalysts and Olefin Polymerization, 414–26. Berlin, Heidelberg: Springer Berlin Heidelberg, 2001. http://dx.doi.org/10.1007/978-3-642-59465-6_37.

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Atti di convegni sul tema "Silica polymerization"

1

Akhavan, B., K. Jarvis e P. Majewski. "Development of hydrophobic silica powders using plasma polymerization technology". In 2012 IEEE 39th International Conference on Plasma Sciences (ICOPS). IEEE, 2012. http://dx.doi.org/10.1109/plasma.2012.6383876.

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2

Baicea, C., A. Ivan, C. Trisca-Rusu, A. C. Nechifor, D. I. Vaireanu, S. I. Voicu e G. Nechifor. "Ionic conductive silica-polypyrrole composites obtained by in-situ polymerization". In 2010 International Semiconductor Conference (CAS 2010). IEEE, 2010. http://dx.doi.org/10.1109/smicnd.2010.5650655.

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3

Tajima, Shota, Tatsuya Kato, Shigeshi Fuchida, Takao Kitagawa e Chiharu Tokoro. "Kinetic Modeling of pH and Temperature Effects on Silica Polymerization". In Goldschmidt2020. Geochemical Society, 2020. http://dx.doi.org/10.46427/gold2020.2529.

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4

Correa, Daniel S., Marcos R. Cardoso, Vinicius Tribuzi, Rafael H. Pacheco e Cleber R. Mendonca. "Excitation of Microstructures Fabricated by Two-photon Polymerization Through Silica Nanowires". In Latin America Optics and Photonics Conference. Washington, D.C.: OSA, 2010. http://dx.doi.org/10.1364/laop.2010.wi4.

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5

Bhattacharyya, Arpita, e Catherine Klapperich. "Fabrication of Polymeric Microfluidic Device for On-Chip Isolation of Nucleic Acids". In ASME 3rd International Conference on Microchannels and Minichannels. ASMEDC, 2005. http://dx.doi.org/10.1115/icmm2005-75200.

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Abstract (sommario):

A microfluidic chip-based solid phase extraction method for isolation of nucleic acids is demonstrated. The chip was fabricated in a cyclic polyolefin by hot embossing with a master. The solid phase was made by in-situ UV polymerization of a monolithic column impregnated with silica particles, and separation was achieved due to irreversible binding of the nucleic acids to the silica particles in the monolith. The porous monolithic column was formed within the channels of the device by photoinitiated polymerization of a mixture of methacrylate and dimethacrylate monomers, UV sensitive free radical initiator and porogenic solvent. The channel surface was photografted with a thin interlayer polymer prior to preparation of the monolith in the channel. The grafted layer covalently attached the monolith and prevented the formation of voids between the monolith and the channel surface. The solid-phase prepared by this method allowed for successful extraction and elution of nucleic acids.

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Reyes, Enrique Antonio. "Applications and Laboratory Studies of a New Class of Silica Polymerization Inhibitors of Biorenewable Origin". In Brasil Offshore. Society of Petroleum Engineers, 2011. http://dx.doi.org/10.2118/143662-ms.

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Onoda, M., T. Moritake, T. Matsuda e H. Nakayama. "Physical properties and application of conducting polypyrrole-silica glass composite films prepared by electrochemical polymerization". In International Conference on Science and Technology of Synthetic Metals. IEEE, 1994. http://dx.doi.org/10.1109/stsm.1994.835312.

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8

Jung, Hojoong, Yong Gon Seo, Woosung Ha, Seung Han Park e Kyunghwan Oh. "New Type of Long-period Fiber Grating by Self-Assembled Periodic Polymerization in Silica Hollow Optical Fiber". In National Fiber Optic Engineers Conference. Washington, D.C.: OSA, 2009. http://dx.doi.org/10.1364/nfoec.2009.jtha15.

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9

Yan, Wei, B. T. Phung, Zhao Jun Han e Kostya Ken Ostrikov. "Dielectric performance of nanocomposites synthesized by poly(ethylene oxide)-like film coated silica nanoparticles by plasma polymerization". In 2013 IEEE Electrical Insulation Conference (EIC). IEEE, 2013. http://dx.doi.org/10.1109/eic.2013.6554281.

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Li, Kuo-Tseng, e Cheng-Ni Yang. "Synthesis of uniform rod-like polymer particles via propylene polymerization using metallocene catalysts supported on Stober silica". In MATERIALS CHARACTERIZATION USING X-RAYS AND RELATED TECHNIQUES. Author(s), 2019. http://dx.doi.org/10.1063/1.5088275.

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Rapporti di organizzazioni sul tema "Silica polymerization"

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Spoerke, Erik David, Sylvie Aubry, Pamela Lane, David B. Robinson, Christina A. Bauer, Frank Zendejas, Huu Tran, Todd W. Lane e Blake Alexander Simmons. Understanding amine catalyzed silica polymerization : diatoms as bioarchitects. Office of Scientific and Technical Information (OSTI), ottobre 2007. http://dx.doi.org/10.2172/922086.

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2

Ramamurthi, S. Molecular growth pathways in silica sol-gel polymerization. Office of Scientific and Technical Information (OSTI), gennaio 1989. http://dx.doi.org/10.2172/6236739.

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3

Zhou, Steven Q., Young T. Park, Georges Manuel e William P. Weber. Composite Materials with Improved Properties in Compression. Appendix 2. Anionic Ring Opening Polymerization of 1-Silacyclopent-3-ene. Characterization of Poly(1-sila-cis-pent-3-ene) by 1H, 13C, and 29Si NMR Spectroscopy. Fort Belvoir, VA: Defense Technical Information Center, maggio 1990. http://dx.doi.org/10.21236/ada221647.

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