Dissertations / Theses: 'Porous Polymers'

1

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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3

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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11

Ghasimi, Saman [Verfasser]. "Conjugated porous polymers for visible-light photocatalysis / Saman Ghasimi." Mainz : Universitätsbibliothek Mainz, 2017. http://d-nb.info/1123047847/34.

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12

Zhao, Wuxue, Fan Zhang, Lingyun Yang, Shuai Bi, Dongqing Wu, Yefeng Yao, Manfred Wagner, et al. "Anionic porous polymers with tunable structures and catalytic properties." Royal Society of Chemistry, 2016. https://tud.qucosa.de/id/qucosa%3A30348.

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A series of boron-containing conjugated microporous polymers with hierarchical porous structures have been readily prepared via typical transition metal-catalyzed coupling reactions. The distribution of micro- and mesopores in the networks as well as the specific surface areas are tunable via tailoring the structures of the building blocks. The distinct capability of the resulting Lewis acid-based neutral porous polymers to selectively capture fluoride ions provides a high-efficiency conversion into stable anionic porous polymers. For the first time, fluoride anion binding to boron atoms in a solid sample was essentially characterized by solid-state 11B MAS NMR spectroscopy, clearly revealing such an efficient conversion from a neutral network to a negatively charged one only through Lewis acid–base adduct formation. Upon a simple ion-exchange process, various heavy metal cations were facile to be loaded into the networks of the anionic porous polymers. Furthermore, the cobalt(II)-loaded porous polymers were shown to promote the stoichiometric homocoupling reactions of the different aryl Grignard regents, and exert distinct size selectivities for the homocoupling products, highly dependent on their porous structures. Such a successful loading strategy might be used for design and synthesis of new types of zeolite-like porous polymers with desirable catalytic properties for a certain organic transformation, as well as other functional materials.

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Zhao, Wuxue, Fan Zhang, Lingyun Yang, Shuai Bi, Dongqing Wu, Yefeng Yao, Manfred Wagner, et al. "Anionic porous polymers with tunable structures and catalytic properties." Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2017. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-225647.

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A series of boron-containing conjugated microporous polymers with hierarchical porous structures have been readily prepared via typical transition metal-catalyzed coupling reactions. The distribution of micro- and mesopores in the networks as well as the specific surface areas are tunable via tailoring the structures of the building blocks. The distinct capability of the resulting Lewis acid-based neutral porous polymers to selectively capture fluoride ions provides a high-efficiency conversion into stable anionic porous polymers. For the first time, fluoride anion binding to boron atoms in a solid sample was essentially characterized by solid-state 11B MAS NMR spectroscopy, clearly revealing such an efficient conversion from a neutral network to a negatively charged one only through Lewis acid–base adduct formation. Upon a simple ion-exchange process, various heavy metal cations were facile to be loaded into the networks of the anionic porous polymers. Furthermore, the cobalt(II)-loaded porous polymers were shown to promote the stoichiometric homocoupling reactions of the different aryl Grignard regents, and exert distinct size selectivities for the homocoupling products, highly dependent on their porous structures. Such a successful loading strategy might be used for design and synthesis of new types of zeolite-like porous polymers with desirable catalytic properties for a certain organic transformation, as well as other functional materials.

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Takashima, Yohei. "Studies on Topology-Directed Functions of Porous Coordination Polymers." 京都大学 (Kyoto University), 2010. http://hdl.handle.net/2433/131893.

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15

Horike, Satoshi. "Syntheses and dynamic properties of functional porous coordination polymers." 京都大学 (Kyoto University), 2007. http://hdl.handle.net/2433/136253.

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Törneman, Hedda. "Development of a porous material from cellulose nanofibrils." Thesis, Linköpings universitet, Institutionen för fysik, kemi och biologi, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-179266.

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Cellulose nanofibrils are a biobased and renewable material with potential to be used in many different applications. Such applications include air filtration, absorption of liquids, and thermal insulation. To be used for these applications the cellulose nanofibrils must form a porous and dry material. However, maintaining some degree of porosity after drying is difficult, since the fibrils are extracted in liquid and tend to collapse into a dense material upon drying. Certain methods have proven effective for making a dry porous material from cellulose nanofibrils, but these are often expensive and not suitable for large scale production. The aim of this project is to test possible methods for making a highly porous cellulose nanofibril-based material. These methods must be environmentally sustainable and suitable for large scale production. An extensive screening has been conducted with the aim of identifying methods resulting in materials with high porosity. The obtained materials have been analysed further to give a more thorough understanding of the porosity as well as other characteristics. The results indicate that cross-links in the material strengthen the structure, and that drying samples from water always results in complete collapse or very dense materials while drying samples from certain solvents other than water results in more porous materials. The analysed materials had very different porosities, some of which were relatively high. The most porous material analysed by Brunauer-Emmett-Teller gas adsorption had a surface area of 9.5 m2/g. This project gives insight into how cross-linking chemistries and treatment with different solvents and pH affect the resulting cellulose nanofibril-based material, as well as knowledge about which methods can be used to successfully produce dry porous cellulose nanofibril-based materials.

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Zhao, Tianxin Zhao. "Silk Based Porous Microneedle Array for Programmable Drug Delivery." University of Akron / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=akron1468852925.

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Kahveci, Zafer. "Diazaborole Linked Porous Polymers: Design, Synthesis, and Application to Gas Storage and Separation." VCU Scholars Compass, 2015. http://scholarscompass.vcu.edu/etd/3916.

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The synthesis of highly porous organic polymers with predefined porosity has attracted considerable attention due to their potential in a wide range of applications. Porous organic polymers (POPs) offer novel properties such as permanent porosity, adjustable chemical nature, and noteworthy thermal and chemical stability. These remarkable properties of the POPs make them promising candidates for use in gas separation and storage. The emission of carbon dioxide (CO2) from fossil fuel combustion is a major cause of global warming. Finding an efficient separation and/or storage material is essential for creating a cleaner environment. Therefore, the importance of the POPs in the field is undeniable. Along these pursuits, several porous polymers have been synthesized with different specifications. The first class of porous polymers are called Covalent Organic Frameworks (COFs). They possess highly ordered structures with very high surface areas and contain light elements. COFs based on B-O, C-N, and B-N bonds have been reported so far. In particular, COFs based on B-O bond formation are well investigated due to the kinetically labile nature of this bond which is essential for overcoming the crystallization problem of covalent networks. Along this line, triptycene-derived covalent organic framework (TDCOF-5) has been synthesized through a condensation reaction between 1, 4-benzenediboronic acid and hexahydroxytriptycene which leads to the formation of boronate ester linkage. TDCOF-5 has the highest H2 uptake under 1 atm at 77K (1.6%) among all known 2D and 3D COFs derived from B–O bond formation and moderate CO2 uptake (2.1 mmol g-1) with Qst values of 6.6 kJ mol-1 and 21.8 kJ mol-1, respectively. The second class of porous structures discussed herein is diazaborole linked polymers (DBLPs). They are constructed based on B-N bond formation and possess amorphous structures due to the lack of the reversible bond formation processes. At this scope, 2, 3, 6, 7, 14, 15-hexaaminotriptycene (HATT) hexahydrocloride was synthesized and reacted with different boronic acid derivatives to produce three different porous polymers under condensation reaction conditions. DBLP-3, -4 and -5 have very high surface areas; 730, 904, and 986 m2 g-1, and offer high CO2 uptake (158.5, 198, and 171.5 mg g-1) at 1 bar and 273 K, respectively. DBLPs have much higher CO2 uptake capacity when compared to almost all reported B-N and B-O containing porous polymers in the field. In addition to high CO2 capacity, DBLPs showed remarkable CO2/N2 and CO2/CH4 selectivity, when the Henry`s law of initial slope selectivity calculations were applied. In general, DBILPs exhibit high selectivities for CO2/N2 (35-51) and CO2/CH4 (5-6) at 298 K which are comparable to those of most porous polymers.

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Ampon, Kamaruzaman. "Immobilization of proteins on porous polymer beads /." The Ohio State University, 1987. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487324944212704.

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20

Hsu, Chen-Ming. "Electrospinning of Poly(£`-Caprolactone)." Digital WPI, 2003. https://digitalcommons.wpi.edu/etd-theses/485.

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The objectives of the present work are to produce porous polymeric scaffolds with Poly (Ã†â€™Ãƒâ€¢-Caprolactone), PCL, by electrospinning. The structure in the electrospun polymer has been characterized by scanning electron microscopy. The effects of process variables such as voltage, solution concentration and deposition distance on the structure have been studied. The physical phenomena associated with the electrospinning process have been highlighted through high speed digital photography. The feasibility of using additives to the solution to control the structure of the porous construct has been examined. The data indicate that a range of structural morphologies can be produced in the electrospun polymer. Solid and hollow sub-micron beads can be produced by electrospraying of dilute solutions. Beyond a critical solution concentration of about 4 wt% PCL, elongational flow stabilizes the fibrous structure and a web of interconnected sub-micron fibers may be obtained. The average fiber diameter increases with concentration. A combination of elongated beads and fibers, known as the bead-on-string morphology is also observed under many conditions. The fibrous structure is stabilized at high voltages. The fiber diameter in the electrospun polymer typically exhibits a bimodal distribution. The addition of DMF (N,N-dimethylformamide) to the solution increases the deposition rate significantly and leads to extensive splaying, thereby reducing the fiber diameter to about 150 nm. DSC data indicate that electrospinning may lower the degree of crystallinity in the polymer. The wide of range of structural characteristics that may be obtained in the electrospun polymer make it suitable for many biomedical applications including medical textiles, drug delivery, membrane separation, tissue engineering and organ regeneration.

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21

Mochizuki, Shuto. "Controlled radical polymerization in designed porous materials." Kyoto University, 2019. http://hdl.handle.net/2433/242535.

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Eder, Grace M. "Dye Molecule-Based Porous Organic Materials." The Ohio State University, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=osu1530012900215452.

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23

Kumar, Raj. "Fabrication et étude de matériaux "mous" à gradient d'indice acoustique." Thesis, Bordeaux, 2019. http://www.theses.fr/2019BORD0186.

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Cette thèse est consacrée à la fabrication et à l’étude d’une nouvelle classe de matériaux à gradient d’indice acoustique (GRIN) pour la manipulation des ondes acoustiques ultrasonores dans l’eau. Comme en optique, les « GRIN acoustiques » sont des matériaux non homogènes, dans lesquels l'indice de réfraction acoustique n =C_(L,eau/air)/C_(L,matériau) varie en fonction de la position à l'intérieur du matériau. Ici, C_(L,eau/air) and 〖 C〗_(L,matériau) sont respectivement les vitesses des ondes acoustiques dans un milieu de référence (l’eau pour l'acoustique sous-marine dont il est question ici) et dans le matériau. Nous décrivons ici la fabrication de matériaux GRIN ultra-minces (c’est-à-dire sub-longueur d’onde) que nous désignons de fait sous le terme de métasurfaces acoustiques « molles » à gradient d’indice, conçues à partir de silicone poreux à indice acoustique élevé. Nous montrons que ces matériaux permettent a priori la génération de tous types de fronts d’onde en milieu sous-marin, et ce sur une très large bande de fréquence des ondes ultrasonores
This thesis is devoted to the fabrication and the study of a novel class of acoustic gradient index (GRIN) materials for the manipulation of waterborne acoustic waves. As in optics, acoustic GRIN are inhomogeneous materials, in which the acoustic refractive index n =C_(L,water/air)/C_(L,material) varies as a function of the position inside the material. Here, C_(L,water/air) and 〖 C〗_(L,material) are the acoustic wave speeds in a reference medium (water for underwater acoustics) and in the material respectively. We here describe the fabrication of ultrathin (i.e. sub-wavelength) GRIN materials named “Soft acoustic gradient index metasurfaces” engineered from soft graded-porous silicone rubbers with a high acoustic index for broadband ultrasonic three-dimensional wave-front shaping in water

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Nakahama, Masashi. "Studies on Hybrid Porous Coordination Polymers with Functional Inorganic Materials." 京都大学 (Kyoto University), 2015. http://hdl.handle.net/2433/200452.

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Kim, Chi Won. "Synthesis of Porous Coordination Polymers for Controlled Nitric Oxide Release." 京都大学 (Kyoto University), 2016. http://hdl.handle.net/2433/204585.

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Hayward, Adam Simon. "Emulsion templated porous polymers as scaffolds for 3D hepatocyte culture." Thesis, Durham University, 2014. http://etheses.dur.ac.uk/10749/.

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Hepatocytes are the main functional cells of the liver and are used extensively in vitro for predicting in vivo drug toxicity profiles. However, the predictive accuracy of in vitro hepatocyte models depends on the physiological relevance of the artificial growth environment. Conventional in vitro hepatocyte models have employed monolayer cultures on two-dimensional (2D) substrates, forcing cells into a flattened morphology that is far removed from the in vivo scenario. Unsurprisingly, 2D cultures often show significant deviations from native liver genotype and phenotype and so are unable to accurately predict drug toxicity. Accordingly, it is hypothesised that approximating the native liver three-dimensional (3D) tissue architecture in vitro will help to preserve genotype and phenotype and so improve predictive accuracy. In this study, emulsion templated porous polymers were investigated as scaffolds for 3D hepatocyte culture. In particular, porous polystyrene scaffolds were explored due to their high porosity, reproducibility and suitable mechanical strength properties. Hepatocytes were cultured on polystyrene scaffolds under a range of culture conditions and were found to approximate native liver density and architecture. The morphology of hepatocytes in scaffolds was representative of in vivo, unlike the flattened morphology of 2D cultures. Crucial ultrastructural features involved in drug detoxification such as bile canaliculi were also present in scaffold cultures, but almost absent from 2D cultures. Importantly, these representative structural features translated into functional and genetic improvements in vitro. Hepatocytes in scaffolds displayed increased albumin synthesis, a key marker of hepatocyte function. Hepatic cell lines also showed increased resistance to drug toxicity compared to 2D cultures. Hepatic drug metabolising genotype was also increased to more physiologically relevant levels in scaffolds compared to 2D cultures. In addition, emulsion templated polystyrene scaffolds were also made more biochemically relevant by surface functionalising with galactose, a ligand known to selectively bind to hepatocytes in vivo via the asialoglycoprotein receptor (ASGP-R). Scaffold morphology was maintained with the incorporation of galactose, allowing cells to approximate native liver tissue architecture. Moreover, the pendent galactose ligands were found to be accessible to hepatocytes adhering onto the scaffold. In summary, this thesis has shown that emulsion templated porous polymers can offer a more physiologically relevant growth environment for hepatocytes in vitro. This could have a profound effect on improving drug toxicity predictions and so reducing the dependence on animal testing.

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Liang, Weibin. "Carbon Dioxide Adsorption and Catalytic Conversion in Porous Coordination Polymers." Thesis, The University of Sydney, 2015. http://hdl.handle.net/2123/14541.

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This thesis reports an investigation into carbon dioxide capture and catalysis in several target metal-organic frameworks (MOFs) and porous organic polymers (POPs). In chapter 2, a series of Zr-MOFs were synthesised for potential applications in carbon capture and storage. In the first instance, a novel Zr-based MOF was constructed exclusively from the monocarboxylate ligand formate. Despite the low surface area, the new material exhibited a high affinity for CO2 over nitrogen at room temperature. In addition, the water-stable Zr–tricarboxylate series of frameworks, exhibited tunable porosity by virtue of systematic modulation of the chain length of the monocarboxylate ligand. Last but not least, defect concentrations and their compensating groups have been systematically tuned within UiO-66 frameworks by using modified microwave-assisted solvothermal methods. Both of these factors have a pronounce effect on CO2 and H2O adsorption at low and high pressure. Chapter 3 focuses on the development of a rapid and efficient microwave-assisted solvothermal method for a series of zirconium oxide based MOFs known as MIL-140s. Combined experimental and computational studies have revealed the interplay between the framework pore size and functionality on the CO2 adsorption performance of MIL-140 frameworks. The potential for CO2 photocatalysis in POPs was also explored in chapter 4. A POP with free 2,2’-bipyridyl sites was prepared via Sonogashira-Hagihara coupling and catalytically active moieties ([(α-diimine)Re(CO)3Cl]) were introduced using a post-synthesis metalation method. Thereafter, the Re-containing porous organic polymer was tested for the photocatalytic reduction of CO2. After an induction period, Re-POP produced CO at a stable rate, unless soluble [(bpy)Re(CO)3Cl] (bpy = 2,2´-bipyridine) was added. This provides some of most convincing evidence to date that [(α-diimine)Re(CO)3Cl] catalysts for photocatalytic CO2 reduction decompose via a bimetallic pathway.

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Tanaka, Daisuke. "Studies on syntheses and sorption properties of porous coordination polymers." 京都大学 (Kyoto University), 2008. http://hdl.handle.net/2433/136309.

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Higgins, Scott R. "Synthesis and Characterization of Hybrid Mesoporous Silicia Membranes." Fogler Library, University of Maine, 2008. http://www.library.umaine.edu/theses/pdf/HigginsSR2008.pdf.

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Andrew, Harold Gibbons. "Design and Application of Optical Polymers." Kyoto University, 2019. http://hdl.handle.net/2433/242585.

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Fujiwara, Yu-ichi. "Synthesis and Formation Mechanism of Carbon Materials from Porous Coordination Polymers." Kyoto University, 2018. http://hdl.handle.net/2433/232058.

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Zocca, Andrea [Verfasser]. "Additive manufacturing of porous ceramic structures from preceramic polymers / Andrea Zocca." Clausthal-Zellerfeld : Universitätsbibliothek Clausthal, 2016. http://d-nb.info/1093614021/34.

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Akiyama, George. "Studies on Synthesis and Application of Water Durable Porous Coordination Polymers." 京都大学 (Kyoto University), 2015. http://hdl.handle.net/2433/198948.

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34

Huang, Wei [Verfasser]. "Conjugated porous polymers for visible light-induced organic transformations / Wei Huang." Mainz : Universitätsbibliothek Mainz, 2017. http://d-nb.info/1143985516/34.

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35

Zeyfert, Caroline Margaret. "Surface functionalised emulsion-templated porous polymers for in-vitro cell culture." Thesis, Durham University, 2010. http://etheses.dur.ac.uk/794/.

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“PolyHIPE” is an acronym for polymerized high internal phase emulsions. The nature of the formation of PolyHIPEs creates a highly porous, interconnected monolith structure, the architecture of which can be tightly controlled. Styrene-2-ethylhexylacrylate-divinylbenzene PolyHIPEs with defined architecture of voids between 80 – 100 μm have been previously investigated as suitable supports for in-vitro cell culture, but the highly hydrophobic nature of the predominantly polystyrene scaffold requires extra processing steps to hydrate the surface before use as a support for cell culture. This thesis addresses routes to surface functionalise these PolyHIPEs for the specific aim of optimising 3D in-vitro cell culture materials. Specific routes to this include chemical modification, plasma treatment and chemical adsorption. Of these three routes to surface functionalisation, the plasma processing appears to give the best results, with further attachment of biologically-directing molecules, possible. This thesis presents oxygen plasma treatment as a route to increase the hydrophilicity of these materials, with a reasonable shelf-life, which both reduces the processing steps before cell culture, and increases cell viability when grown on the functionalised PolyHIPE. The ultimate aim in this project is to create smart “off-the-shelf” materials that can control cell behaviour in-vitro. Chemical attachment to the surface of the PolyHIPE with synthetic retinoid EC23 has been proposed, and initial chemical tests obtained to suggest attachment, with future testing with mammalian cells envisaged.

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Hebb, Andrew Kevin. "Synthesis of well-defined monolithic porous polymers using compressed fluid solvents." Thesis, University of Liverpool, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.402305.

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Evans, Nathan Timothy. "Processing-structure-property relationships of surface porous polymers for orthopaedic applications." Diss., Georgia Institute of Technology, 2016. http://hdl.handle.net/1853/55004.

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The use of polymers in orthopaedics is steadily increasing. In some markets, such as spinal fusion and soft tissue anchors, the polymer polyetheretherketone (PEEK) is already the material of choice in the majority of implants. Despite PEEK’s widespread use, it is often associated with poor osseointegration, which can lead to implant loosening and ultimately failure of the device. Many attempts have been explored to improve the osseointegration of PEEK but none have had widespread clinical success. In this dissertation, a novel surface porous structure has been created, where limiting the porosity to the surface maintains adequate mechanical properties for load bearing applications while providing a surface for improved osseointegration. Careful control of the processing parameters resulted in tunable porous microstructures optimized for bone ingrowth: highly interconnected 200-500µm pores with porosity ranging from 60-85% and pore layers from 300-6000µm thick. Mechanical characterization, including monotonic tensile and compression, tensile fatigue, shear, and abrasion tests, were used to probe the effects of the surface porosity on the relevant mechanical properties of the material. In addition, the effect of surface porosity and surface roughness on the mechanical properties of a range of thermoplastics with varying chemistries and crystallinities was explored. This research showed that there is a great disparity in the notch sensitivity of polymers that correlates to the polymers fracture toughness as well as trends in the monotonic stress-strain curve. The results illustrate that care must be taken in the design of polymeric implants, especially when introducing topographical changes to promote osseointegration, in order to ensure they maintain adequate load-bearing capacity. Finally, preliminary in vitro and in vivo data demonstrated the ability of surface porous PEEK (PEEK-SP) to promote osseointegration. Cells grown on PEEK-SP demonstrated enhanced mineralization and differentiation, suggesting the ability of PEEK-SP to facilitate bone ingrowth. The potential of PEEK-SP was further demonstrated by implantation in a rat femoral segmental defect model which demonstrated bone ingrowth and reduced formation of a fibrous capsule.

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Kimmins, Scott David. "Emulsion-templated porous polymers as support materials for covalent enzyme immobilization." Thesis, Durham University, 2011. http://etheses.dur.ac.uk/902/.

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It has been observed that poly(High Internal Phase Emulsion) (polyHIPE) materials can be used as a biocatalysts, via the covalent immobilization of Candida Antarctica Lipase B (CAL-B). Recently, it has been shown that polyHIPEs can be prepared with epoxy functionality, which show potential for the covalent immobilization of enzymes. The aims of our work were, firstly, to produce an open-void glycidyl methacrylate (GMA)-based polyHIPE material. Secondly, these materials were then to be developed for use within a continuous flow set-up. Thirdly, the post-polymerisation of these materials was to be investigated. Finally, these materials were to be used as a support for the covalent immobilization of enzymes. Highly porous, open-void GMA-based polyHIPE materials were accomplished via the photo- initiation, rather than thermal initiation of the continuous phase of the emulsion. The rapid cure of the emulsion effectively ‘locks’ the emulsion morphology, prior to emulsion destabilisation, that is more prominent in the slower thermally initiated HIPEs. Photopolymerised GMA-based polyHIPE materials were further developed for use within a continuous flow-set up. GMA-based polyHIPE materials were functionalized post-polymerisation with tris(2-aminoethyl)amine, morpholine and O,O’-bis(3-aminopropyl)polyethylene glycol. The functionalization of these GMA-based materials was observed via a number of analysis techniques, such as FT-IR spectroscopy, XPS spectroscopy, elemental analysis, Fmoc number determination, 1H HR-MAS NMR spectroscopy, and the covalent attachment of ninhydrin and FITC. Elemental analysis of the morpholine and tris(2-aminoethyl)amine polyHIPE showed that a near quantitative conversion, of 72 and 82 % respectively, was accomplished via the reaction being conducted at reflux for 24 hours. The enzymes, Lipase from Candida Antarctica and Proteinase K from Tritirachium album were immobilized either directly onto the polyHIPE material or via a hydrophilic spacer group, O,O’-bis(3-aminopropyl)polyethylene glycol. CAL was immobilized with a loading of between 5.4 and 7.5 wt. % per g of polyHIPE material.

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Pyles, David Andrew. "Design and Application of Novel Benzobisoxazole and Benzobisthiazole Linked Porous Polymers." The Ohio State University, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=osu155428770646841.

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Shimomura, Satoru. "Studies on Syntheses and Properties of TCNQ based Porous Coordination Polymers." 京都大学 (Kyoto University), 2011. http://hdl.handle.net/2433/142185.

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Matsuda, Ryotaro. "Studies on syntheses, structures and porous properties of microporous coordination polymers." 京都大学 (Kyoto University), 2005. http://hdl.handle.net/2433/144533.

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Kyoto University (京都大学)
0048
新制・課程博士
博士(工学)
甲第11794号
工博第2554号
新制||工||1354(附属図書館)
23534
UT51-2005-F824
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, 教授村上正浩, 教授宮原稔
学位規則第4条第1項該当

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Wang, Zi Jun [Verfasser]. "Conjugated porous polymers for heterogeneous visible light photocatalysis / Zi Jun Wang." Mainz : Universitätsbibliothek der Johannes Gutenberg-Universität Mainz, 2016. http://d-nb.info/1225296293/34.

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Kitao, Takashi. "Controlled Assembly Structures of Conjugated Polymers Mediated by Coordination Nanospaces." 京都大学 (Kyoto University), 2017. http://hdl.handle.net/2433/225635.

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44

Saltzman, William Mark. "A microstructural approach for modelling diffusion of bioactive macromolecules in porous polymers." Thesis, Massachusetts Institute of Technology, 1987. http://hdl.handle.net/1721.1/14625.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Harvard-MIT Division of Health Sciences and Technology Program in Medical Engineering and Medical Physics, 1987.
Bibliography: v. 2, leaves 335-343.
by William Mark Saltzman.
Ph.D.

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Cheong, Jae Eun. "DEVELOPMENT OF SPIROLIGOMER SCAFFOLDS FOR INHIBITING HIV FUSION AND POROUS ORGANIC POLYMERS." Diss., Temple University Libraries, 2016. http://cdm16002.contentdm.oclc.org/cdm/ref/collection/p245801coll10/id/406966.

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Chemistry
Ph.D.
This research presents a new approach to creating large, complex molecules to carry out molecular recognition and catalytic functions mimicking biological proteins. Development of new therapeutics that bind protein surfaces and disrupt protein-protein interactions was first addressed targeting the envelope transmembrane protein in HIV-1, gp41. In this work, spiroligomer inhibitors of gp41 were designed and synthesized, and then the biochemical activity was tested. Rationally designed inhibitors were developed using computational modeling with the Molecular Operating Environment software (MOE). To build the desired molecular shape according to the design, C-2 alkylation of a bis-amino acid monomer was investigated to synthesize the higher degree of bis-amino acids with various reaction conditions for access to all possible diastereomers. Based on this design and synthetic methodology, a spiroligomer targeting gp41 was built by synthesizing each monomer and then linking them together by diketopiperazine (DKP). For the biological evaluation, the gp41-5 gene was transformed into E. coli and the protein was expressed, purified, and refolded for an in vitro binding test. A direct binding, fluorescence polarization assay was used to evaluate the binding affinity of the functionalized spiroligomer to the gp41-5 protein. Its antiviral activity was assessed in collaboration with the Chaiken lab at Drexel University. In addition, investigation into how the unique structures provided by the spiroligomer backbone allow for various uses, such as functionalized struts in porous organic polymers (POPs). In the large internal space of a POP, a nucleophilic, catalytic spiroligomer was installed to increase the reaction rate for the hydrolysis of methyl paraoxon (a neurotoxin G agent stimulant). Spiroligomers were designed and synthesized with backbone DMAP moieties, and the activity of these catalysts was analyzed in collaboration with the Hupp lab at Northwestern University.
Temple University--Theses

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Li, Yang Yang. "Porous silicon photonic crystals as hosts for polymers, biopolymers, and magnetic nanoparticles /." Diss., Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC campuses, 2004. http://wwwlib.umi.com/cr/ucsd/fullcit?p3153688.

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Balubaid, Eyad Khalid M. "Preparation and Characterization of Porous PDMS for Printed Electronics." Wright State University / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=wright1578073290398846.

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Wang, Xiaoxi. "Solvent-free fabrication of porous polymer for tissure engineering applications /." Thesis, Connect to this title online; UW restricted, 2007. http://hdl.handle.net/1773/7070.

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Yao, Yimin. "POLYMERIC POROUS AEROGEL MONOLITHS AND AEROGEL PARTICLES SYNTHESIZED FROM OIL-IN-OIL EMULSIONS." University of Akron / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=akron1590687157263171.

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Guerrero, Maribel Hernandaz Chemical Sciences &amp Engineering Faculty of Engineering UNSW. "Honeycomb tructured porous films from different polymer architectures - preparation, mechanism, analysis and post-treatment." Publisher:University of New South Wales. Chemical Sciences & Engineering, 2008. http://handle.unsw.edu.au/1959.4/43341.

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This dissertation studies and examines the process of formation of honeycomb structured porous films using various polymer architectures ranging from linear, comb, star polymers and a random copolymer. Four casting methods were designed and applied for the production of structured porous materials. The airflow casting technique, cold-stage casting technique, casting on water technique and emulsion casting technique all based in either direct water introduction to the system or indirect condensation from the environment showed to be viable options for casting of high quality porous materials. The control and study of the effect of environmental conditions towards the quality of the films has been examined through the design of a casting device and the use of the casting methods. Furthermore, the versatility of each of the architectures towards the production of honeycomb porous films has been studied. Highly regular honeycomb structured porous films were obtained from all the complex architectures namely comb polymers, star polymers and the random copolymer. However, the linear polymers did not result in regular films. Moreover the quality of the films has been assessed and mathematically quantified. In addition, some mechanistic aspects of the process of formation of honeycomb structured porous films have been addressed. Variables such as the viscosity and evaporation of polymer solutions were examined. Furthermore, the precipitation behaviour of various polymer architectures was inspected. Only the polymer architectures showing a lower viscosity and late precipitation deemed highly regular films. Finally, the modification of highly regular films from a comb polymer and a random copolymer was successfully performed for the first time by grafting a thermoresponsive polymer from the RAFT groups already present in the porous material. The non-treated films showed a typical hydrophobic behaviour for a porous membrane however after the grafting, the films exhibited hydrophilic behaviour.

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Dissertations / Theses on the topic 'Porous Polymers'

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