Dissertations / Theses on the topic 'Polyethylene oxide (POE)'
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Riquel-Loizelet, Noelline. "Assemblages supramoleculaires de type (pseudo)polyrotaxane : vers la synthèse de modèles biocompatibles de cellules musculaires." Electronic Thesis or Diss., université Paris-Saclay, 2025. http://www.theses.fr/2025UPASF004.
Full textInspired by the living world, biomimicry encourages the development of new families of materials for a wide range of applications. In this context, (pseudo)polyrotaxane-type supramolecular assemblies, like strings of pearls, could make it possible to obtain innovative stimulable materials, for example materials capable of mimicking the movement of a muscle under the effect of a stimulus. The aim of this thesis was to synthesize biocompatible, thermostimulable (pseudo)polyrotaxanes from γ-cyclodextrin (γ-CD) and block copolymers, consisting of poly(N-isopropylacrylamide) (PNIPAM) and poly(ethylene oxide) (POE), in order to obtain materials whose mechanical properties could be reversibly modified in response to an external stimulus. PNIPAM was chosen for its thermosensitive properties, while POE was chosen for its particular affinity with cyclodextrins, making them easier to thread. During this thesis work, the formation of supramolecular assemblies with CDs was first studied in the presence of homopolymers of PNIPAM and POE (of variable lengths and variable ends), then with diblock, then triblock copolymers (ABA or BAB), synthesized by different routes (coupling, ATRP, RAFT). Characterization of the edifices was carried out by mobilizing various analytical techniques: 1H NMR, MALDI-TOF, DRX, CES and TGA. The results showed that γ-CDs threaded predominantly onto the POE block whether located in the center or at the ends of the various copolymers with a number of CDs that could be controlled, depending on the (γ-CDs):(polymer) stoichiometry adopted prior to complexation, chain length, temperature. Several architectures have been proposed for these assemblies
Lu, Chen Pelton Robert H. "Mechanisms of filler flocculation with PEO/cofactor dual-component flocculants /." *McMaster only, 2003.
Find full textCong, Rongjuan Pelton Robert H. "PEO/poly(vinyl phenol-co-styrene sulfonate) aqueous complex formation /." *McMaster only, 2002.
Find full textDuan, Xiadong. "Biomedical applications of dendrimer-modified polyurethanes with PEO (polyethylene oxide) attached." Thesis, University of Ottawa (Canada), 2001. http://hdl.handle.net/10393/9023.
Full textLiu, Zaiwen. "Conformation and orientation of an alanine-rich polypeptide incorporated in electrospun PEO fibers." Access to citation, abstract and download form provided by ProQuest Information and Learning Company; downloadable PDF file, 60 p, 2008. http://proquest.umi.com/pqdweb?did=1597632371&sid=7&Fmt=2&clientId=8331&RQT=309&VName=PQD.
Full textDu, Ying Jun. "PEO and PEO-heparin modified surfaces for blood contacting applications /." *McMaster only, 2001.
Find full textHamilton-Brown, Paul Optometry & Vision Science Faculty of Science UNSW. "A surface forces and protein adsorption study of grafted PEO layers." Awarded by:University of New South Wales. School of Optometry and Vision Science, 2006. http://handle.unsw.edu.au/1959.4/25541.
Full textThar, Dhaval. "Acetone Induced Structural Effects on Charge Storage in PEO-Graphite Supercapacitor Electrodes." University of Cincinnati / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1490351036541031.
Full textChen, Wei. "Local Structure and Molecular Dynamics of Supramolecules And Semicrystalline Polymers As Investigated By Solid State NMR." University of Akron / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=akron1459960834.
Full textShi, Jingjun. "Chain Dynamics in the Crystalline Region of Polyethylene Oxide (PEO) as Investigated by Solid-State NMR." University of Akron / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=akron1428341117.
Full textAbakar, Adam Omar. "Elaboration, structuration et propriétés rhéologiques de nanocomposites polymères modèles à base de Laponite." Phd thesis, Université du Maine, 2012. http://tel.archives-ouvertes.fr/tel-00756711.
Full textYan, Xuejia. "Drop-on-demand inkjet drop formation of dilute polymer solutions." Diss., Georgia Institute of Technology, 2010. http://hdl.handle.net/1853/42713.
Full textQuant, Carlos Arturo. "Colloidal chemical potential in attractive nanoparticle-polymer mixtures: simulation and membrane osmometry." Thesis, Georgia Institute of Technology, 2004. http://hdl.handle.net/1853/7616.
Full textMural, Prasanna Kumar S. "Porous Antibacterial Membranes Derived from Polyethylene (PE)/Polyethylene Oxide (PEO) Blends and Engineered Nanoparticles." Thesis, 2016. https://etd.iisc.ac.in/handle/2005/3742.
Full textMural, Prasanna Kumar S. "Porous Antibacterial Membranes Derived from Polyethylene (PE)/Polyethylene Oxide (PEO) Blends and Engineered Nanoparticles." Thesis, 2016. http://etd.iisc.ernet.in/2005/3742.
Full textYang, Po-Chun, and 楊博淳. "Determination of surface areas of montmorillonite by PEO (Polyethylene oxide) adsorption in aqueous solution." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/63058852289042887733.
Full text國立成功大學
資源工程學系碩博士班
91
The traditional methods of surface area measurements are BET method (Branouer, Emmet and Teller method), EG method (Ethylene glycol method), EGME method (Ethylene glycol monoethyl ether method) and MB method (Methylene blue method). BET method has been recognized that it can not measure the total surface areas of expandable clays due to nitrogen does not interact with or have access to the interlayer surfaces. The surface area measurement result of EG, EGME methods are influenced by the species of exchangeable cation within clay. MB method has been used to measure surface area of clay in solution, still the result is influenced by CEC (Cation Exchange Capacity) of clays samples. The determination of surface areas of expandable clay by PEO (Polyethylene oxide) adsorption in aqueous solution is the main research topic in this study. Our discussion is focus on the feasibility of using ethylene oxide chain to determine the surface areas of expandable clay. Experimental results indicate that the ethylene oxide chain of PEO is coating on the interlamellar space of montmorillonite fully, which is composed predominately of a SiO2 (Si tetrahedral sheets) surface. Consequently, we can use the area of a single ethylene oxide chain unit to calculate the surface area of expandable clay. The surface areas of montmorillonite sample A, B, C, D determined by PEO adsorption method were 337 m2/g, 116 m2/g, 187 m2/g and 198 m2/g respectively. In this study, we also found that the surface areas of expandable clays in aqueous solution are related to particle size but not to CEC. Conclusively, we found that PEO adsorption is suitable way to measure the surface area expandable clays in solution.
Heintz, Keely. "Synthesis and evaluation of PEO-coated materials for microchannel-based hemodialysis." Thesis, 2012. http://hdl.handle.net/1957/32641.
Full textGraduation date: 2013
Dill, Justen K. "Quantifying nisin adsorption behavior at pendant polyethylene oxide brush layers." Thesis, 2012. http://hdl.handle.net/1957/30210.
Full textGraduation date: 2012
Isreb, A., K. Baj, M. Wojsz, Mohammad Isreb, M. Peak, and M. A. Alhnan. "3D printed oral theophylline doses with innovative 'radiator-like' design: Impact of polyethylene oxide (PEO) molecular weight." 2019. http://hdl.handle.net/10454/17496.
Full textDespite the abundant use of polyethylene oxides (PEOs) and their integration as an excipient in numerous pharmaceutical products, there have been no previous reports of applying this important thermoplastic polymer species alone to fused deposition modelling (FDM) 3D printing. In this work, we have investigated the manufacture of oral doses via FDM 3D printing by employing PEOs as a backbone polymer in combination with polyethylene glycol (PEG). Blends of PEO (molecular weight 100 K, 200 K, 300 K, 600 K or 900 K) with PEG 6 K (plasticiser) and a model drug (theophylline) were hot-melt extruded. The resultant filaments were used as a feed for FDM 3D printer to fabricate oral dosage forms (ODFs) with innovative designs. ODFs were designed in a radiator-like geometry with connected paralleled plates and inter-plate spacing of either 0.5, 1, 1.5 or 2 mm. X-ray diffraction patterns of the filaments revealed the presence of two distinctive peaks at 2θ = 7° and 12°, which can be correlated to the diffraction pattern of theophylline crystals. Blends of PEO and PEG yielded filaments of variable mechanically resistance (maximum load at break of 357, 608, 649, 882, 781 N for filament produced with PEO 100 K, 200 K, 300 K, 600 K or 900 K, respectively). Filaments of PEO at a molecular weight of 200–600 K were compatible with FDM 3D printing process. Further increase in PEO molecular weight resulted in elevated shear viscosity (>104 Pa.S) at the printing temperature and hindered material flow during FDM 3D printing process. A minimal spacing (1 mm) between parallel plates of the radiator-like design deemed essential to boost drug release from the structure. This is the first report of utilising this widely used biodegradable polymer species (PEOs and PEG) in FDM 3D printing.
Li, Hongtao. "Study of polymer hydration and drug release: texture analysis and model evaluation." 2012. http://hdl.handle.net/1993/8115.
Full textAuxier, Julie A. "Retention of protein repulsive character and antimicrobial activity of PEO brush layers following nisin entrapment." Thesis, 2012. http://hdl.handle.net/1957/35800.
Full textGraduation date: 2013
Deshmukh, Shivprasad S., Anant R. Paradkar, S. Abrahmsén-Alami, R. Govender, A. Viridén, F. Winge, H. Matic, J. Booth, and Adrian L. Kelly. "Injection moulded controlled release amorphous solid dispersions: Synchronized drug and polymer release for robust performance." 2019. http://hdl.handle.net/10454/18155.
Full textA study has been carried out to investigate controlled release performance of caplet shaped injection moulded (IM) amorphous solid dispersion (ASD) tablets based on the model drug AZD0837 and polyethylene oxide (PEO). The physical/chemical storage stability and release robustness of the IM tablets were characterized and compared to that of conventional extended release (ER) hydrophilic matrix tablets of the same raw materials and compositions manufactured via direct compression (DC). To gain an improved understanding of the release mechanisms, the dissolution of both the polymer and the drug were studied. Under conditions where the amount of dissolution media was limited, the controlled release ASD IM tablets demonstrated complete and synchronized release of both PEO and AZD0837 whereas the release of AZD0837 was found to be slower and incomplete from conventional direct compressed ER hydrophilic matrix tablets. Results clearly indicated that AZD0837 remained amorphous throughout the dissolution process and was maintained in a supersaturated state and hence kept stable with the aid of the polymeric carrier when released in a synchronized manner. In addition, it was found that the IM tablets were robust to variation in hydrodynamics of the environment and PEO molecular weight.
The research was funded by AstraZeneca, Sweden.