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Статті в журналах з теми "Heterogeneous Polystyrene"
Lemaire, Marc. "Heterogeneous asymmetric catalysis." Pure and Applied Chemistry 76, no. 3 (January 1, 2004): 679–88. http://dx.doi.org/10.1351/pac200476030679.
Повний текст джерелаBarbosa, Antonio C. F., Marcelo R. Pace, Luciana Witovisk, and Veronica Angyalossy. "A new method to obtain good anatomical slides of heterogeneous plant parts." IAWA Journal 31, no. 4 (2010): 373–83. http://dx.doi.org/10.1163/22941932-90000030.
Повний текст джерелаMalik, Muhammad Salman, Asif Ali Qaiser, and Muhammad Ahmed Arif. "Structural and electrochemical studies of heterogeneous ion exchange membranes based on polyaniline-coated cation exchange resin particles." RSC Advances 6, no. 116 (2016): 115046–54. http://dx.doi.org/10.1039/c6ra24594c.
Повний текст джерелаYu, Rongbing, Shupeng Zhang, Yuting Luo, Ruofei Bai, Jiangfang Zhou, and Haiou Song. "Synthetic possibility of polystyrene functionalization based on hydroxyl groups of graphene oxide as nucleophiles." New Journal of Chemistry 39, no. 7 (2015): 5096–99. http://dx.doi.org/10.1039/c5nj00815h.
Повний текст джерелаWang, Chia-Ying, and M. D. Ediger. "Lifetime of spatially heterogeneous dynamic domains in polystyrene melts." Journal of Chemical Physics 112, no. 15 (April 15, 2000): 6933–37. http://dx.doi.org/10.1063/1.481319.
Повний текст джерелаDong, Laura Beth, Salomon Turgman-Cohen, George W. Roberts, and Douglas J. Kiserow. "Effect of Polymer Size on Heterogeneous Catalytic Polystyrene Hydrogenation." Industrial & Engineering Chemistry Research 49, no. 22 (November 17, 2010): 11280–86. http://dx.doi.org/10.1021/ie1011905.
Повний текст джерелаNair, Vipin A., Suni M. Mustafa, and Sreekumar Krishnapillai. "Polystyrene Supported Manganese Complexes: Heterogeneous Catalysts for Oxidation Reactions." Journal of Polymer Research 10, no. 4 (2003): 267–73. http://dx.doi.org/10.1023/b:jpol.0000004629.53837.b3.
Повний текст джерелаLiang, Yeru, Luyi Chen, Dongyang Zhuang, Hao Liu, Ruowen Fu, Mingqiu Zhang, Dingcai Wu, and Krzysztof Matyjaszewski. "Fabrication and nanostructure control of super-hierarchical carbon materials from heterogeneous bottlebrushes." Chemical Science 8, no. 3 (2017): 2101–6. http://dx.doi.org/10.1039/c6sc03961h.
Повний текст джерелаSharma, Saurabh, Yamini Yamini, and Pralay Das. "Hydrogenation of nitroarenes to anilines in a flow reactor using polystyrene supported rhodium in a catalyst-cartridge (Cart-Rh@PS)." New Journal of Chemistry 43, no. 4 (2019): 1764–69. http://dx.doi.org/10.1039/c8nj04646h.
Повний текст джерелаHassan, Yusuf, Rosa Klein, and Perry T. Kaye. "Synthesis and characterization of new chiral ketopinic acid-derived catalysts immobilized on polystyrene-bound imidazole." Ovidius University Annals of Chemistry 28, no. 1 (February 23, 2017): 7–10. http://dx.doi.org/10.1515/auoc-2017-0002.
Повний текст джерелаДисертації з теми "Heterogeneous Polystyrene"
Noble, Kristen Felice. "Tailored Chain Sequences of Brominated Syndiotactic Polystyrene Copolymers via Post-Polymerization Functionalization in the Heterogeneous Gel State." Diss., Virginia Tech, 2019. http://hdl.handle.net/10919/93515.
Повний текст джерелаDoctor of Philosophy
Block copolymers are a class of large molecules (polymers) that are made up of two or more chains (blocks) of different smaller units (monomers) linked together at one of each of the chain ends. When the monomers that make up each block have distinctly different chemical properties, the blocks may be capable of self-assembling into well-ordered physical structures, which give the block copolymer unique material properties that are different, and often better than the properties of the individual blocks alone (homopolymers). Block cop olymers have thus received tremendous attention with respect to controlled preparation, tailored structure development, and customized physical properties, for their potential use in self-assembled, nanostructured materials. Nevertheless, the generally difficult procedures and conditions required to make (polymerize) block copolymers with controlled sequences limits the scope of their commercial application. As an alternative to conventional polymerization methods, this dissertation demonstrates a comparatively simple physical method to make copolymers that contain significantly non-random (blocky) monomer sequences, starting with a homopolymer and using a reagent to modify units along the polymer chain. This post-polymerization method is conducted in the homopolymer’s gel state, in which segments of the homopolymer chains are effectively shielded from the reagent. The homopolymer, syndiotactic polystyrene (sPS), was used as a model to conduct a fundamentical investigation into the effects of the polymer reaction state, i.e., gel, solution, or powder, and the gel structure (morphology) on the copolymer structure and properties. The gel-state was found to produce copolymers with a high degree of modification and a greater degree of blockiness than the solution-state and powder-state. Copolymers prepared from the gel state exhibited properties that are characteristic of conventional block copolymers. Furthermore, using the gel-state method, blocky copolymers with tailored chain sequences and properties were prepared by simply changing the gel morphology. Thus, reaction in the gel-state is demonstrated as a simple physical approach to polymer design and synthesis that will be useful in the development of next-generation functionalized materials through the modification of lowcost commodity polymers. As an advancement to the manner in which nanostructured materials are created, these tailored materials will greatly enhance the convenience of block copolymers for a wide variety of applications including structural and biomechanical materials, and polymeric membranes for energy conversion and water purification systems.
Fahs, Gregory Bain. "The Effect of Ionomer Architecture on the Morphology in Gel State Functionalized Sulfonated Syndiotactic Polystyrene." Diss., Virginia Tech, 2020. http://hdl.handle.net/10919/97193.
Повний текст джерелаDoctor of Philosophy
Polymers are a class of chemicals that are defined by having a very large set of molecules that are chemically linked together where each unit (monomer) is repeated within the chemical structure. In particular, this dissertation focuses on the construction what are termed as "blocky" copolymers, which are defined by having two chemically different monomers that are incorporated in the polymer chain. The "blocky" characteristic of these polymers means that these two different monomers are physically segregated from each other on the polymer chain, where long portions of the chain that are of one type, followed by another section of the polymer that has the other type of monomer. The goal of creating this type of structure is to try to take advantage of the properties of both types of monomers, which can create materials with superior synergistic properties. In this case a hydrophobic (water hating) monomer is combined with a hydrophilic (water loving) chain. This hydrophobic component in the polymer is able to crystallize, which provides mechanical and thermal stability in the material by acting as a physical tether to hold neighboring chains together. With the other set of hydrophilic monomers, which in this case have an ionic component incorporated, we can now take advantage of this chemical components ability to aide in the transportation of ions. Transportation of ions is useful in a variety of commercially relevant applications, two of the most important applications of these ionic materials is in membranes that can be used to purify water or membrane materials in fuel cell technologies, specifically for proton exchange membranes. The focus of this research in particular was to create a simple synthesis technique that can create these blocky polymer chain architectures, which is done by performing the reaction while the polymer is made into a gel. The key to this is that the crystals within the gel act as a barrier to chemical reactions, creating conditions where we have substantial portions of the material that are able to be functionalized and the crystals within the material that are protected from being functionalized. By looking at the thermal characteristics, such as melting temperatures and amount of crystals within these systems we have seen that functionalizing these polymers in the heterogeneous gel state gives substantially better properties than functionalizing these materials randomly. Much like oil and water, incompatible polymer chains will phase separate from each other. In this case the hydrophobic and ionic components will phase separate from each other. The shape and distribution of these phase separated structure will dictate many of the material properties, which can be described by modeling the data collected from x-ray scattering experiments. All of this information will tell us based on the initial conditions that these polymers were created in, what properties should be expected based on the morphology and thermal behavior. This gives a better understanding of how to fine tune these properties based on the structure of the gel and chemical reaction conditions.
Langhe, Deepak. "POLYMER CRYSTALLIZATION IN DROPLETS AND CONFINED LAYERS USING MULTILAYERED FILMS." Case Western Reserve University School of Graduate Studies / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=case1317931856.
Повний текст джерелаFisher, Daniel C. "PREPARATION AND APPLICATION OF CATALYSTS FOR THE STEREOSPECIFIC REDUCTION AND PHOTOOXYGENATION OF OLEFINS IN CONTINUOUS OPERATIONS: A NOVEL METHOD FOR THE PRODUCTION OF ARTEMISININ." VCU Scholars Compass, 2017. https://scholarscompass.vcu.edu/etd/5159.
Повний текст джерелаSantos, Fábio Júnior Mota dos. "Espumas de poliestireno impregnadas com nanopartículas de ouro para a redução do p-nitrofenol." Universidade Estadual da Paraíba, 2017. http://tede.bc.uepb.edu.br/jspui/handle/tede/3026.
Повний текст джерелаMade available in DSpace on 2018-05-18T12:53:12Z (GMT). No. of bitstreams: 1 PDF - Fábio Junior Mota dos Santos.pdf: 16470271 bytes, checksum: 931fe4e9cb3a582ced25e4d4c19d1ffc (MD5) Previous issue date: 2017-03-31
There are countless researches related to the treatment of waste water because they contain large amounts of recalcitrant chemicals, such as p-Nitrophenol widely used in the industry in dyeing leather. Because it is a very toxic substance even at low concentrations, its total removal and / or transformation into other less polluting substances becomes an urgent environmental issue. Gold nanoparticles because they have great catalytic potential besides being non-toxic can somehow contribute to the minimization of the environmental effects caused by nitrophenols. Reactions using homogeneous catalysts are not very feasible in some cases, they present great difficulty during the separation of the catalysts from the rest of the reaction medium. In this context, this work aimed at the development of a catalyst based on gold nanoparticles impregnated in polystyrene foams an industrial waste, using thermally induced phase separation as the method of obtaining the same. It is then tested for catalytic reduction of p-Nitrophenol. The gold nanoparticles of different diameters were obtained using different synthesis conditions and characterized by spectrophotometry in the region of the visible for the size measurement, whereas for the already impregnated foams the characterization techniques used were the scanning electron microscopy (SEM), X-ray diffraction (XRD), thermogravimetric (TG) analysis and thermogravimetric analysis (DTG). The catalyst was tested using as a model reaction the reduction of p-Nitrophenol to p-Aminophenol, the whole process was accompanied by UV-vis and what is concluded is a variation in the reaction velocities as a function of the variation of the particle size present in the foam and / or their concentrations therein.
Já são inúmeras as pesquisas relacionadas ao tratamento de águas residuais pelo fato de as mesmas conterem grandes quantidades de substancias químicas recalcitrantes, a exemplo do p-Nitrofenol muito utilizado na indústria no tingimento de couro. Por se tratar de uma sustância muito tóxica mesmo em baixas concentrações sua total remoção e/ou transformação em outras menos poluentes, torna-se uma questão ambiental urgente. As nanopartículas de ouro por apresentarem grande potencial catalítico além de não serem tóxicas, podem de alguma forma contribuir para a minimização dos efeitos agressivos ao ambiente causados por nitrofenóis. Reações que utilizam catalisadores homogêneos são pouco viáveis em alguns casos, apresentam grande dificuldade durante a separação do catalisados do restante do meio reacional. Nesse contexto esse trabalho objetivou o desenvolvimento de um catalisador a base de nanopartículas de ouro impregnadas em espumas de poliestireno um rejeito industrial, utilizando como método de obtenção para o mesmo a separação de fases induzida termicamente. Para então testa-lo na redução catalítica do p-Nitrofenol. As nanopartículas de ouro de diferentes diâmetros foram obtidas utilizando-se diferentes condições de síntese e caracterizadas através da espectrofotometria na região do visível para a aferição do tamanho, enquanto que para as espumas já impregnadas as técnicas de caracterização utilizadas foram a microscopia eletrônica de varredura (MEV), difração de raio-X (DRX), analise termogravimétrica (TG) a derivada da analise termogravimétrica (DTG). O catalisador foi testado utilizando como reação modelo a redução do p-Nitrofenol a p-Aminofenol, todo o processo foi acompanhado por UV-vis e o que se conclui é uma variação nas velocidades das reações em função da variação do tamanho de partículas presente na espuma ou/e de suas concentrações na mesma.
Gittsegrad, Anna. "Heterogeneous Structural Organization of Polystyrene Fibers Prepared by Electrospinning." Thèse, 2018. http://hdl.handle.net/1866/20040.
Повний текст джерелаWang, Chia-Ying. "Spacially heterogeneous dynamics in supercooled O-terphenyl and polystyrene melts /." 1999. http://www.library.wisc.edu/databases/connect/dissertations.html.
Повний текст джерелаManz, Alyssa Sarah Jane Hennings. "Probing Heterogeneous Dynamics One Molecule at a Time: Polystyrene near the Glass Transition." Thesis, 2019. https://doi.org/10.7916/d8-ge1m-yv03.
Повний текст джерелаThurau, Courtney T. "Physical aging and equilibrium dynamics of polystyrene and polycarbonate : the role of spatially heterogeneous dynamics /." 2002. http://www.library.wisc.edu/databases/connect/dissertations.html.
Повний текст джерелаКниги з теми "Heterogeneous Polystyrene"
Alyssa Sarah Jane Hennings Manz. Probing Heterogeneous Dynamics One Molecule at a Time: Polystyrene near the Glass Transition. [New York, N.Y.?]: [publisher not identified], 2019.
Знайти повний текст джерелаЧастини книг з теми "Heterogeneous Polystyrene"
Davankov, Vadim, and Maria Tsyurupa. "Macroporous (Heterogeneous) Polystyrene Networks." In Hypercrosslinked Polymeric Networks and Adsorbing Materials, 71–116. Elsevier, 2011. http://dx.doi.org/10.1016/s0166-526x(11)56003-9.
Повний текст джерелаT. Varkey, Jaya. "Synthesis and Catalytic Activity Studies of Silver Nanoparticles Stabilized in Polymeric Hydro Gel." In Silver Micro-Nanoparticles - Properties, Synthesis, Characterization, and Applications. IntechOpen, 2021. http://dx.doi.org/10.5772/intechopen.97824.
Повний текст джерелаSheppard, R. C. "Introduction — a retrospective viewpoint." In Fmoc Solid Phase Peptide Synthesis. Oxford University Press, 1999. http://dx.doi.org/10.1093/oso/9780199637256.003.0005.
Повний текст джерелаТези доповідей конференцій з теми "Heterogeneous Polystyrene"
Zhao, Jun-Feng, and Han-Xiong Huang. "Migration of Nanoclay in PP/PS Blend and Effect of Its Localization on Cell Structure." In ASME 2008 International Mechanical Engineering Congress and Exposition. ASMEDC, 2008. http://dx.doi.org/10.1115/imece2008-68660.
Повний текст джерелаBinkley, Michael, Andrew Ledbetter, Stefanie Shahan, and J. Mark Meacham. "Reduced Order Modeling and Experimental Investigation of Acoustic Particle Manipulation in Complex 3D Geometries." In ASME 2016 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/imece2016-66904.
Повний текст джерелаBurra, K. G., P. Singh, N. Déparrois, and A. K. Gupta. "Pyrolysis and CO2 Gasification of Composite Polymer Absorbent Waste for Syngas Production." In ASME 2019 Power Conference. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/power2019-1884.
Повний текст джерелаЗвіти організацій з теми "Heterogeneous Polystyrene"
Afeworki, Mobae, and Jacob Schaefer. Mechanism of DNP-Enhanced Polarization Transfer Across the Interface of Polycarbonate/Polystyrene Heterogeneous Blends. Fort Belvoir, VA: Defense Technical Information Center, November 1991. http://dx.doi.org/10.21236/ada242570.
Повний текст джерела