Relevant bibliographies by topics / Porous Polymers

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Porous Polymers'

Author: Grafiati
Published: 4 June 2021
Last updated: 6 September 2023

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Journal articles on the topic "Porous Polymers"

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Wu, Cai-Ying, and Walter A. Aue. "Protected porous polymers." Canadian Journal of Chemistry 67, no. 3 (March 1, 1989): 389–401. http://dx.doi.org/10.1139/v89-062.

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This study was designed to answer the question whether the chromatographic performance of porous polymers — serving here as a model system for pressure-sensitive separation media of relatively large mass transfer resistance — could be improved (a) by imposing on them a chromatographically favorable, extrinsic macrostructure and (b) by protecting that macrostructure against physical deformation. Packed-column gas chromatography was used as the test system.Protected porous polymers (PPP's) were synthesized from pure divinylbenzene (DVB) inside conventional diatomaceous supports, using various amounts and types of porogens. The non-extractable polymer loads ranged from 10 to 40% and conformed to (i.e. formed layers on) the diatomaceous macrostructures. The best plate numbers were in excess of 4000/m on a 100/120 mesh Chromosorb W base. The mass transfer resistance of these materials was very low and permitted high flow rates. The PPP's could be used up to 280 °C and did not appear to suffer deformation; in fact, the polymer appeared to shield the diatom supports from abrasion. The data indicate that the porous polymer deposits had relatively high specific surface areas, and produced a relatively large value for the free energy of sorption per methylene group, as compared with conventional porous polymer beads. Otherwise, protected and unprotected types of porous polymers had similar chromatographic characteristics. Keywords: porous polymer, poly(divinylbenzene), gas chromatography, protected polymer, diatoms.
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Wang, Hui, Genyuan Wang, Liang Hu, Bingcheng Ge, Xiaoliang Yu, and Jiaojiao Deng. "Porous Polymer Materials for CO2 Capture and Electrocatalytic Reduction." Materials 16, no. 4 (February 15, 2023): 1630. http://dx.doi.org/10.3390/ma16041630.

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Efficient capture of CO2 and its conversion into other high value-added compounds by electrochemical methods is an effective way to reduce excess CO2 in the atmosphere. Porous polymeric materials hold great promise for selective adsorption and electrocatalytic reduction of CO2 due to their high specific surface area, tunable porosity, structural diversity, and chemical stability. Here, we review recent research advances in this field, including design of porous organic polymers (POPs), porous coordination polymers (PCPs), covalent organic frameworks (COFs), and functional nitrogen-containing polymers for capture and electrocatalytic reduction of CO2. In addition, key issues and prospects for the optimal design of porous polymers for future development are elucidated. This review is expected to shed new light on the development of advanced porous polymer electrocatalysts for efficient CO2 reduction.
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Naga, Naofumi, Minako Ito, Aya Mezaki, Hao-Chun Tang, Tso-Fu Mark Chang, Masato Sone, Hassan Nageh, and Tamaki Nakano. "Morphology Control and Metallization of Porous Polymers Synthesized by Michael Addition Reactions of a Multi-Functional Acrylamide with a Diamine." Materials 14, no. 4 (February 9, 2021): 800. http://dx.doi.org/10.3390/ma14040800.

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Porous polymers have been synthesized by an aza-Michael addition reaction of a multi-functional acrylamide, N,N′,N″,N‴-tetraacryloyltriethylenetetramine (AM4), and hexamethylene diamine (HDA) in H2O without catalyst. Reaction conditions, such as monomer concentration and reaction temperature, affected the morphology of the resulting porous structures. Connected spheres, co-continuous monolithic structures and/or isolated holes were observed on the surface of the porous polymers. These structures were formed by polymerization-induced phase separation via spinodal decomposition or highly internal phase separation. The obtained porous polymers were soft and flexible and not breakable by compression. The porous polymers adsorbed various solvents. An AM4-HDA porous polymer could be plated by Ni using an electroless plating process via catalyzation by palladium (II) acetylacetonate following reduction of Ni ions in a plating solution. The intermediate Pd-catalyzed porous polymer promoted the Suzuki-Miyaura cross coupling reaction of 4-bromoanisole and phenylboronic acid.
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Berro, Soumaya, Ranim El Ahdab, Houssein Hajj Hassan, Hassan M. Khachfe, and Mohamad Hajj-Hassan. "From Plastic to Silicone: The Novelties in Porous Polymer Fabrications." Journal of Nanomaterials 2015 (2015): 1–21. http://dx.doi.org/10.1155/2015/142195.

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Porous polymers are gaining increased interest in several areas due, in great part, to their large surface area and unique physiochemical properties. Porous polymers are conventionally manufactured using specific processes related to the chemical structure of each polymer. With the wide variety of porous polymers that have been designed, fabricated, and tested to date, this review aims to provide an overview of the advances and recent progress in the preparation processes and fabrication techniques. A detailed comparison between these techniques is also provided. Some of these techniques offer the advantage of controlling the porosity and the possibility to obtain porous 3D polymers. A new generic fabrication process that can be applied to all liquid polymers to texture their outer surfaces with a desired porosity is also presented. The proposed process, which is based on two micromolding steps, offers flexibility in terms of tailoring the texture of the final polymer by simply using porous silicon templates with different pore sizes and configurations. The anticipated process was successfully implemented to texture polyethyl hydrosiloxane (PMHS) using porous silicon and polymethyl methacrylate (PMMA) scaffolds.
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Zhang, Huacheng, Jie Han, and Chao Li. "Pillararene-based conjugated porous polymers." Polymer Chemistry 12, no. 19 (2021): 2808–24. http://dx.doi.org/10.1039/d1py00238d.

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Mirzaie Yegane, Mohsen, Pouyan E. Boukany, and Pacelli Zitha. "Fundamentals and Recent Progress in the Flow of Water-Soluble Polymers in Porous Media for Enhanced Oil Recovery." Energies 15, no. 22 (November 16, 2022): 8575. http://dx.doi.org/10.3390/en15228575.

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Due to increased energy demand, it is vital to enhance the recovery from existing oilfields. Polymer flooding is the most frequently used chemical enhanced oil recovery (cEOR) method in field applications that increases the oil sweep and displacement efficiencies. In recent years, there has been growing interest to assess the use of polymer flooding in an increasing number of field applications. This is due to the improved properties of polymers at high-salinity and high-temperature conditions and an increased understanding of the transport mechanisms of water-soluble polymers in porous media. In this review, we present an overview of the latest research into the application of polymers for cEOR, including mechanisms of oil recovery improvement and transport mechanisms in porous media. We focus on the recent advances that have been made to develop polymers that are suitable for high-salinity and high-temperature conditions and shed light on new insights into the flow of water-soluble polymers in porous media. We observed that the viscoelastic behavior of polymers in porous media (e.g., shear thickening and elastic turbulence) is the most recently debated polymer flow mechanism in cEOR applications. Moreover, advanced water-soluble polymers, including hydrophobically modified polymers and salt- and temperature-tolerant modified polyacrylamides, have shown promising results at high-salinity and high-temperature conditions.
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Tan and Rodrigue. "A Review on Porous Polymeric Membrane Preparation. Part II: Production Techniques with Polyethylene, Polydimethylsiloxane, Polypropylene, Polyimide, and Polytetrafluoroethylene." Polymers 11, no. 8 (August 5, 2019): 1310. http://dx.doi.org/10.3390/polym11081310.

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The development of porous polymeric membranes is an important area of application in separation technology. This article summarizes the development of porous polymers from the perspectives of materials and methods for membrane production. Polymers such as polyethylene, polydimethylsiloxane, polypropylene, polyimide, and polytetrafluoroethylene are reviewed due to their outstanding thermal stability, chemical resistance, mechanical strength, and low cost. Six different methods for membrane fabrication are critically reviewed, including thermally induced phase separation, melt-spinning and cold-stretching, phase separation micromolding, imprinting/soft molding, manual punching, and three-dimensional printing. Each method is described in details related to the strategy used to produce the porous polymeric membranes with a specific morphology and separation performances. The key factors associated with each method are presented, including solvent/non-solvent system type and composition, polymer solution composition and concentration, processing parameters, and ambient conditions. Current challenges are also described, leading to future development and innovation to improve these membranes in terms of materials, fabrication equipment, and possible modifications.
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Gawdzik, B., and M. Maciejewska. "Studies on the Selectivity of Porous Methacrylate Polymers." Adsorption Science & Technology 20, no. 5 (June 2002): 523–30. http://dx.doi.org/10.1260/026361702320644806.

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Four types of porous methacrylate polymers were synthesized as stationary phases for gas chromatography. The influence of the chemical structure of the monomers used in the synthesis on the selectivities of the resulting polymers was studied. Two procedures were applied to determine the selectivities of the copolymers: the selectivity triangle and the general selectivity. Porapak Q, the least polar commercially available porous polymer, was used as a reference phase.
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Silverstein, Michael S. "Special Issue of Polymer on porous polymers." Polymer 55, no. 1 (January 2014): 302–3. http://dx.doi.org/10.1016/j.polymer.2013.11.008.

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Morones-Ramírez, J. Rubén. "Coupling Metallic Nanostructures to Thermally Responsive Polymers Allows the Development of Intelligent Responsive Membranes." International Journal of Polymer Science 2014 (2014): 1–7. http://dx.doi.org/10.1155/2014/967615.

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Development of porous membranes capable of controlling flow or changing their permeability to specific chemical entities, in response to small changes in environmental stimuli, is an area of appealing research, since these membranes present a wide variety of applications. The synthesis of these membranes has been mainly approached through grafting of environmentally responsive polymers to the surface walls of polymeric porous membranes. This synergizes the chemical stability and mechanical strength of the polymer membrane with the fast response times of the bonded polymer chains. Therefore, different composite membranes capable of changing their effective pore size with environmental triggers have been developed. A recent interest has been the development of porous membranes responsive to light, since these can achieve rapid, remote, noninvasive, and localized flow control. This work describes the synthesis pathway to construct intelligent optothermally responsive membranes. The method followed involved the grafting of optothermally responsive polymer-metal nanoparticle nanocomposites to polycarbonate track-etched porous membranes (PCTEPMs). The nanoparticles coupled to the polymer grafts serve as the optothermal energy converters to achieve optical switching of the pores. The results of the paper show that grafting of the polymer andin situsynthesis of the metallic particles can be easily achieved. In addition, the composite membranes allow fast and reversible switching of the pores using both light and heat permitting control of fluid flow.
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Dissertations / Theses on the topic "Porous Polymers"

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Tran-Viet, Alexis. "Temperature-sensitive polymers in porous media." Thesis, University of Cambridge, 2012. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.610437.

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Bezuidenhout, Deon. "Porous polymeric superstructures as in-growth scaffolds for tissue-engineered vascular prostheses." Thesis, Stellenbosch : Stellenbosch University, 2001. http://hdl.handle.net/10019.1/52404.

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Long, James. "Protein containing porous polymers for biocatalytic applications." Thesis, Liverpool John Moores University, 2005. http://researchonline.ljmu.ac.uk/5660/.

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Over the last twenty years there has been a great deal of research conducted into the use of enzymes as catalysts for reactions conducted in non-aqueous media. Not only has it been shown that enzymes can function effectively in organic media, but also that the range of reactions that they can catalyse has been vastly increased. The major disadvantages associated with non-aqueous enzymatic catalysis are relatively slow reaction rates compared to traditional aqueous catalysis, poor enzyme stability towards polar organic solvents and protein agglomeration, which leads to reduced efficiency, making recovery and reuse of the enzyme very difficult. Immobilisation of the enzyme on a suitable support material has been shown to be an effective method in overcoming these problems. This study examined several different methods for immobilising a-chymotrypsin on novel support materials. The catalytic activities of the preparations were assayed by following the transesteriflcation reaction between N-acetyl-L-tyrosine ethyl ester (A TEE) and propan-l-ol by high performance liquid chromatography (HPLC). Immobilised enzyme activities were compared to those obtained for simple unsupported lyophilised preparations of a-chymotrypsin. Uniform porous poly(acrylamide) beads were loaded with various quantities of enzyme via an adsorption procedure. Catalytic activity was measured over a wide range of thermodynamic water activities and was found to be similar to the lyophilised preparations. However, the immobilised enzyme was shown to be more resistant to changes in pH and temperature, and could easily be recovered from the reaction mixture and reused. Design of experiment methodology was employed to optimise support matrices constructed from six component materials. The enzyme was immobilised via a noncovalent entrapment method. The best composites prepared displayed a fifty-fold increase in catalytic activity and a three-fold increase in mechanical strength relative to the equivalent a-chymotrypsin controls. These materials could be reused more than ten times whilst still retaining useful catalytic activity. Porous poly(acrylamide) monoliths containing entrapped a-chymotrypsin were synthesised using a novel carbon dioxide high internal phase emulsion templating technique. The effects of enzyme loading, carbon dioxide pressure and monomer to crosslinker ratio were examined. The corresponding enzyme activity of all the emulsion templated materials was shown to be higher than for the unsupported lyophilised preparations, with the best materials exhibiting a ten-fold increase in activity. Multipoint covalent enzyme immobilisation was also studied. The structure of the enzyme was first modified so as to include a polymerisable functionality. This modified enzyme was then dissolved in organic solvents via the formation of ion-pairs with various anionic surfactants. It was shown that the enzyme remained in solution when transferred from organic solvents to a mixture of monomers. The dense gas porogen R134a was then added to the solution of enzyme in monomer, prior to the initiation of a polymerisation reaction. The resulting crosslinked enzyme-containing polymers were shown to possess useful catalytic activity.
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Hirai, Kenji. "Studies on Macroscale Structuralization of Porous Coordination Polymers." 京都大学 (Kyoto University), 2013. http://hdl.handle.net/2433/174892.

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Inubushi, Yasutaka. "Studies on Porous Coordination Polymers for Methane Purification." 京都大学 (Kyoto University), 2017. http://hdl.handle.net/2433/225308.

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Perera, S. P. "Gas chromatography and surface chemistry of porous polymers." Thesis, Brunel University, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.376652.

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Bureekaew, Sareeya. "Studies on Physicochemical Properties of Porous Coordination Polymers." 京都大学 (Kyoto University), 2009. http://hdl.handle.net/2433/88045.

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Kyoto University (京都大学)
0048
新制・課程博士
博士(工学)
甲第15007号
工博第3181号
新制||工||1478(附属図書館)
27457
UT51-2009-R731
京都大学大学院工学研究科合成・生物化学専攻
(主査)教授 北川 進, 教授 杉野目 道紀, 教授 濵地 格
学位規則第4条第1項該当
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Beals, Neil Bradley. "The fatigue behavior of porous polysulfone coatings for orthopaedic applications." Thesis, Georgia Institute of Technology, 1986. http://hdl.handle.net/1853/17777.

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Teo, Nicholas J. "Nano, Micro and Macro Scale Control of Porous Aerogel Morphology." University of Akron / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=akron154989595598542.

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Fukushima, Tomohiro. "Studies on Assemblage-Directed Functions of Porous Coordination Polymers." 京都大学 (Kyoto University), 2014. http://hdl.handle.net/2433/188548.

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Books on the topic "Porous Polymers"

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Silverstein, Michael S., Neil R. Cameron, and Marc A. Hillmyer, eds. Porous Polymers. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2011. http://dx.doi.org/10.1002/9780470929445.

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Porous polymers. Hoboken, N.J: Wiley, 2011.

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Long, Timothy E., Brigitte Voit, and Oguz Okay, eds. Porous Carbons – Hyperbranched Polymers – Polymer Solvation. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-13617-2.

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Perera, Semali P. Gas chromatography and surface chemistry of porous polymers. Uxbridge: Brunel University, 1987.

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Gualandi, Chiara. Porous Polymeric Bioresorbable Scaffolds for Tissue Engineering. Berlin, Heidelberg: Springer-Verlag Berlin Heidelberg, 2011.

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Kakushinteki na takōshitsu zairyō: Kūkan o motsu kinōsei busshitsu no sōsei = Novel porous materials. Kyōto-shi: Kagaku Dōjin, 2010.

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MacGillivray, Leonard. Metal-organic frameworks: Design and application. Hoboken, N.J: Wiley, 2010.

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Macroporous polymers: Production properties and biotechnological/biomedical applications. Boca Raton: CRC Press/Taylor & Francis, 2010.

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1945-, Mattiasson Bo, Kumar Ashok 1963-, and Galaev Igor, eds. Macroporous polymers: Production properties and biotechnological/biomedical applications. Boca Raton: Taylor & Francis, 2010.

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Clark, Gordon E. Evaluation of charred porous polymers as a method of storm water pollution prevention for shipyards. Springfield, Va: Available from National Technical Information Service, 1998.

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Book chapters on the topic "Porous Polymers"

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McKeown, Neil B., and Peter M. Budd. "Polymers with Inherent Microporosity." In Porous Polymers, 1–29. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2011. http://dx.doi.org/10.1002/9780470929445.ch1.

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Black, Charles T. "High-Performance Microelectronics." In Porous Polymers, 359–85. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2011. http://dx.doi.org/10.1002/9780470929445.ch10.

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Behrendt, Jonathan, and Andrew Sutherland. "Polymer-supported Reagents and Catalysts." In Porous Polymers, 387–434. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2011. http://dx.doi.org/10.1002/9780470929445.ch11.

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Thomas, Arne, Jens Weber, and Markus Antonietti. "Templates for Porous Inorganics." In Porous Polymers, 435–46. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2011. http://dx.doi.org/10.1002/9780470929445.ch12.

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Todd, Eric M., and Marc A. Hillmyer. "Porous Polymers from Self-Assembled Structures." In Porous Polymers, 31–78. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2011. http://dx.doi.org/10.1002/9780470929445.ch2.

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Qian, Lei, and Haifei Zhang. "Porogen Incorporation and Phase Inversion." In Porous Polymers, 79–117. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2011. http://dx.doi.org/10.1002/9780470929445.ch3.

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Cameron, Neil R., Peter Krajnc, and Michael S. Silverstein. "Colloidal Templating." In Porous Polymers, 119–72. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2011. http://dx.doi.org/10.1002/9780470929445.ch4.

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Roque-Malherbe, Rolando M. A. "Surface Area and Porosity Characterization of Porous Polymers." In Porous Polymers, 173–203. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2011. http://dx.doi.org/10.1002/9780470929445.ch5.

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Baklanov, Mikhail R., and Denis Shamiryan. "Nondestructive Evaluation of Critical Properties of Thin Porous Films." In Porous Polymers, 205–45. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2011. http://dx.doi.org/10.1002/9780470929445.ch6.

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Meyers, Gregory, Anand Badami, Steve Rozeveld, Bob Cieslinski, Clifford Todd, Charlie Wood, Deborah Rothe, William Heeschen, and Gary Mitchell. "Microscopy Characterization of Porous Polymer Materials." In Porous Polymers, 247–74. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2011. http://dx.doi.org/10.1002/9780470929445.ch7.

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Conference papers on the topic "Porous Polymers"

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Wang, Xiaoxi, Wei Li, and Vipin Kumar. "Solvent Free Fabrication of Biodegradable Porous Polymers." In ASME 2004 International Mechanical Engineering Congress and Exposition. ASMEDC, 2004. http://dx.doi.org/10.1115/imece2004-59553.

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Biodegradable porous polymers with interconnected pores of sub-micrometers to a few hundred micrometers find many applications in emerging technology areas such as tissue engineering, controlled drug delivery, and biochemical sensors. However, most of the current fabrication processes involve organic solvents and chemical blowing agents that may cause environmental concerns and leave residues harmful to biological cells. This paper presents a solvent free fabrication approach for biodegradable porous polymers. Ultrasound cavitation is introduced after the solid state foaming process to produce open cell structures. The material used in this study is polylactic acid (PLA). It belongs to a family of biodegradable polymers that can be used for tissue engineering scaffolds. In order to identify suitable conditions to apply ultrasound, a saturation and foaming study is conducted for the PLA-CO2 gas polymer system. The effects of various process variables are discussed.
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Alentiev, Dmitry A., and Maxim V. Bermeshev. "Porous polymers from norbornene derivatives." In PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS: ICAM 2019. AIP Publishing, 2019. http://dx.doi.org/10.1063/1.5130360.

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Obernauer, S., N. Temprano, R. Chertcoff, A. G. D'Onofrio, S. Gabbanelli, and M. Rosen. "Miscible Displacement of Polymers in Porous Media." In SPE Latin America/Caribbean Petroleum Engineering Conference. Society of Petroleum Engineers, 1994. http://dx.doi.org/10.2118/27054-ms.

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Thomas, A., N. Gaillard, C. Favero, J. Bai, K. Green, and F. Wassmuth. "Performance of Associative Polymers in Porous Media." In IOR 2013 - 17th European Symposium on Improved Oil Recovery. Netherlands: EAGE Publications BV, 2013. http://dx.doi.org/10.3997/2214-4609.20142625.

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Wang, Hai, and Wei Li. "Toward the Fabrication of Hierarchically-Structured Porous Polymers for Tissue Engineering Scaffords." In ASME 2005 International Mechanical Engineering Congress and Exposition. ASMEDC, 2005. http://dx.doi.org/10.1115/imece2005-81140.

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Hierarchically-structured porous polymers play an important role in scaffold-based tissue engineering. However, the fabrication of these polymers presents a significant challenge because of the requirements of controllable pore size, distribution and interconnectivity. In this work, we report on a novel porous polymer fabrication method using high-intensity focused ultrasound (HIFU). The measurements of both spatial and temporal temperature field are reported for biocompatible PMMA (polymethyl methacrylate) samples insonated with a 1.1 MHz/3.3 MHz HIFU transducer. The acoustic power and insonation duration were both varied. The results have shown that HIFU has a dramatic heating effect on polymers: the temperature increasing rate can exceed 20°C/second and the final temperature can be higher than 120°C. This rapid, localized heating effect is exploited to foam CO2 saturated PMMA samples selectively and generate hierarchical microstructures. The created microstructures were characterized using the scanning electron microscopy (SEM). The results have shown that the amount and rate of acoustic energy dissipation during the HIFU insonation directly affect the polymer foaming process. Preliminary theoretical modeling of the acoustic field and heat transfer behavior in the porous polymers are also presented.
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Ananthanarayan, Venkatesh T., and Fyodor Shutov. "Morphology and Mechanical Properties of a Novel Family of Porous Polymer Based on UHMW Polyethylene for Biomedical Applications." In ASME 2000 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2000. http://dx.doi.org/10.1115/imece2000-1946.

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Abstract The objective of the research was to develop and study the properties of porous Ultra High Molecular Weight (UHMW) Polyethylene for biomedical applications. The process, based on the leaching technique does not require any modification in the processing equipment, is environmentally friendly and use raw materials approved by the FDA for in vivo medical applications. It is possible to produce porous polymers having predetermined pore size, pore shape and porosity using the leaching technique. The pores are interconnected and well distributed throughout the three dimensional volume of the sample. The size, shape and content of the porogen in the molding mixture greatly affect the physical properties of the pores in the final porous sample. Maximum porosity of 60% was obtained. The developed porous UHMW polyethylene, which is permeable for liquids, can be used as a substrate matrix in bone regeneration and in hip and knee joint replacements. The porous implants with adequate lubrication would prevent the formation of polymer debris due to friction and thereby increase the life of the biomedical implants. The new generation of porous polymers developed could be used in a wide range of applications.
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Wang, Hai, and Wei Li. "A Novel Passive Polymeric Micromixer Using 3D Porous Structure." In ASME 2007 2nd Frontiers in Biomedical Devices Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/biomed2007-38051.

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In microfluidic related chemical and biological applications, mixing on the micro scale is important and has been considered as one of the most challenging tasks. With a trend for polymeric microfluidic systems, a simple yet efficient passive micromixer is highly preferred [1–4]. We developed a novel passive micromixer with 3D porous microstructure on a polymer chip. The fabrication process uses high-intensity focused ultrasound to selectively foam gas-impregnated polymers. The selective ultrasonic foaming technique is simple, low-cost, and biocompatible. The porous microstructure is easily controlled by adjusting the parameters of the ultrasonic foaming process. The 3D porous microstructure can split, stretch, fold and break the mixing flows in microfluidic channels and thus dramatically improve the mixing efficiency.
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Price, Aaron D., and Hani E. Naguib. "Synthesis and characterization of porous polyaniline conductive polymers." In The 14th International Symposium on: Smart Structures and Materials & Nondestructive Evaluation and Health Monitoring, edited by Yoseph Bar-Cohen. SPIE, 2007. http://dx.doi.org/10.1117/12.716602.

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Darwish, Mohamed I. M., Pim van Boven, Hans C. Hensens, and P. L. J. Zitha. "Porous Media Flow of Oil Dispersions in Polymers." In SPE Annual Technical Conference and Exhibition. Society of Petroleum Engineers, 1999. http://dx.doi.org/10.2118/56741-ms.

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Smith, Anwen, Andreas K. Klein, Claudio Balocco, and Natasha Shirshova. "Porous Polymers as a Substrate for Terahertz Spectroscopy." In 2018 43rd International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz 2018). IEEE, 2018. http://dx.doi.org/10.1109/irmmw-thz.2018.8510517.

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Reports on the topic "Porous Polymers"

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Lohne, Arild, Arne Stavland, Siv Marie Åsen, Olav Aursjø, and Aksel Hiorth. Recommended polymer workflow: Interpretation and parameter identification. University of Stavanger, November 2021. http://dx.doi.org/10.31265/usps.202.

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Injecting a polymer solution into a porous medium significantly increases the modeling complexity, compared to model a polymer bulk solution. Even if the polymer solution is injected at a constant rate into the porous medium, the polymers experience different flow regimes in each pore and pore throat. The main challenge is to assign a macroscopic porous media “viscosity” to the fluid which can be used in Darcy law to get the correct relationship between the injection rate and pressure drop. One can achieve this by simply tabulating experimental results (e.g., injection rate vs pressure drop). The challenge with the tabulated approach is that it requires a huge experimental database to tabulate all kind of possible situations that might occur in a reservoir (e.g., changing temperature, salinity, flooding history, permeability, porosity, wettability etc.). The approach presented in this report is to model the mechanisms and describe them in terms of mathematical models. The mathematical model contains a limited number of parameters that needs to be determined experimentally. Once these parameters are determined, there is in principle no need to perform additional experiments.
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Ma, Shengqian. Functionalized Porous Organic Polymers as Uranium Nano-Traps for Efficient Recovery of Uranium from Seawater. Office of Scientific and Technical Information (OSTI), August 2018. http://dx.doi.org/10.2172/1471108.

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Bendikov, Michael, and Thomas C. Harmon. Development of Agricultural Sensors Based on Conductive Polymers. United States Department of Agriculture, August 2006. http://dx.doi.org/10.32747/2006.7591738.bard.

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In this 1-year feasibility study, we tried polymerization of several different monomers, commercial as well as novel, specially designed and synthesized for this project in the presence of the nitrate ion to produce imprinted conductive polymers. Polymers 1 and 2 (shown below) produced a response to nitrate, but one inferior to that produced by a polypyrrole (Ppy)-based sensor (which we demonstrated prior to this study). Thus, we elected to proceed with improving the stability of the Ppy-based sensor. In order to improve stability of the Ppy-based sensor, we created a two-layer design which includes nitrate-doped Ppy as an inner layer, and nitrate-doped PEDOT as the outer layer. PEDOT is known for its high environmental stability and conductivity. This design has demonstrated promise, but is still undergoing optimization and stability testing. Previously we had failed to create nitrate-doped PEDOT in the absence of a Ppy layer. Nitrate-doped PEDOT should be very promising for sensor applications due to its high stability and exceptional sensing properties as we showed previously for sensing of perchlorate ions (by perchlorate-doped PEDOT). During this year, we have succeeded in preparing nitrate-doped PEDOT (4 below) by designing a new starting monomer (compound 3 below) for polymerization. We are currently testing this design for nitrate sensing. In parallel with the fabrication design studies, we fabricated and tested nitrate-doped Ppy sensors in a series of flow studies under laboratory and field conditions. Nitrate-doped Ppy sensors are less stable than is desirable but provide excellent nitrate sensing characteristics for the short-term experiments focusing on packaging and deployment strategies. The fabricated sensors were successfully interfaced with a commercial battery-powered self-logging (Onset Computer Hobo Datalogger) and a wireless data acquisition and transmission system (Crossbow Technologies MDA300 sensor interface and Mica2 wireless mote). In a series of flow-through experiments with water, the nitrate-doped Ppy sensors were exposed to pulses of dissolved nitrate and compared favorably with an expensive commercial sensor. In 24-hour field tests in both Merced and in Palmdale, CA agricultural soils, the sensors responded to introduced nitrate pulses, but with different dynamics relative to the larger commercial sensors. These experiments are on-going but suggest a form factor (size, shape) effect of the sensor when deployed in a porous medium such as soil. To fill the need for a miniature reference electrode, we identified and tested one commercial version (Cypress Systems, ESA Mini-reference electrode) which works well but is expensive ($190). To create an inexpensive miniature reference electrode, we are exploring the use of AgCl-coated silver wire. This electrode is not a “true” reference electrode; however, it can calibrated once versus a commercial reference electrode at the time of deployment in soil. Thus, only one commercial reference electrode would suffice to support a multiple sensor deployment.
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Shepodd, Timothy J., and Christopher P. Stephens. Development of porous polymer monoliths for reverse-phase chromatography of proteins. Office of Scientific and Technical Information (OSTI), September 2003. http://dx.doi.org/10.2172/918341.

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Frechet, Jean M., Eric C. Peters, and Frantisek Svec. Functionalized Porous Polymer Sheets as Models of Thermoresponsive Membranes for Water Treatment. Fort Belvoir, VA: Defense Technical Information Center, June 1996. http://dx.doi.org/10.21236/ada310584.

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Zhou, Hong-Cai Joe, Gregory Steven Day, and Koray Ozdemir. Evaluation of amine-incorporated porous polymer networks (aPPNs) as sorbents for post­combustion CO2 capture. Office of Scientific and Technical Information (OSTI), April 2019. http://dx.doi.org/10.2172/1525327.

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Majumdar, Partha, Elizabeth Lee, Bret J. Chisholm, Shawn M. Dirk, Michael Weisz, James Bahr, and Kris Schiele. The development of a high-throughput gradient array apparatus for the study of porous polymer networks. Office of Scientific and Technical Information (OSTI), January 2010. http://dx.doi.org/10.2172/984130.

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Kidder, Michelle K., Lyndsey D. Earl, and Valmor F. de Almeida. Improved Structural Design and CO2 Capture of Porous Hydroxy-Rich Polymeric Organic Frameworks. Office of Scientific and Technical Information (OSTI), April 2016. http://dx.doi.org/10.2172/1376310.

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Oostrom, Mart, Thomas W. Wietsma, Matthew A. Covert, and Vince R. Vermeul. An Experimental Study of Micron-Size Zero-Valent Iron Emplacement in Permeable Porous Media Using Polymer-Enhanced Fluids. Office of Scientific and Technical Information (OSTI), December 2005. http://dx.doi.org/10.2172/877070.

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