Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 51 for “"Poly(vinyl alcohol)"”.
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Microrheology and microstructure of poly(vinyl alcohol)-based physical gels
… and microstructure of physically cross-linked poly(vinyl alcohol) (PVA) gels using atomic force microscopy, dynamic light scattering and particle tracking. We compare the microscopic rheological properties with the bulk properties measured using conventional shear rheometry, and correlate the …
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The blending of hydroxypropyl lignin with poly(methylmethacrylate) and poly(vinyl alcohol)
Polymer blends consisting of hydroxypropyl lignin (HPL ) and commercially available poly(methyl methacrylate) (PMMA ) and poly(vinyl alcohol) (PVA) were evaluated in terms of their morphology, viscoelastic properties and mechanical properties. In the case of HPL/PMMA blends experimental variables …
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Preparation and characterisation of poly(ethylene terephthalate) and poly(vinyl alcohol)/clay nanocomposites.
The formation of poly (ethylene terephthalate) (PET)/organo-montmorillonite and poly (vinyl alcohol)(PVOH)/ montmorillonite nanocomposites and the diffusion behaviour of water and acetone/water mixtures into the latter have been investigated. Nanocomposites of PET and various, commercially …
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Synthetic crosslinking of poly(vinyl alcohol) for use in a synthetic articular cartilage,
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Chemical Engineering, 1972.
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Hydrogen-bonded layer-by-layer assembly of poly(vinyl alcohol) and tannic acid
… thin films containing tannic acid (TA) and poly(vinyl alcohol) (PVA) were assembled under different pH conditions, and film growth and dissolution behavior was assessed through profilometry. Optimal film growth was achieved at pH 4.0, which contrasted with uncontrollable assembly at lower pH …
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Use of poly vinyl alcohol (PVA) cryogelation for tissue engineering: composites, scaffold formation and cell encapsulation
PVA cryogelation is a physical hydrogel formation method, which yields cryogels with comparable mechanical properties to vascular tissue. However PVA cryogels are not suitable for cell attachment and proliferation alone. This can be overcome by the development of composite cryogels. Moreover, …
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Crystalline radiation-crosslinked hydrogels of poly(vinyl-alcohol) as potential biomaterials: a study of the properties of poly(vinyl-alcohol) hydrogels in relation to conditions of primary crosslinking by irradiation, and of secondary network reinforcement by crystallization,
Thesis (Sc. D.)--Massachusetts Institute of Technology, Dept. of Chemical Engineering, 1974.
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Compressive Mechanics Of A Poly (Vinyl Alcohol)-Based Hydrogel System For The Replacement Of The Knee Meniscus
… in the image of the native meniscus. Blends of poly (vinyl alcohol) PVA and poly (vinyl pyrrolidone) (PVP) present a potential solution. PVA has shown similar characteristics to soft tissues. PVP further stabilizes the hydrogel network. This work is the mechanical characterization of PVA/PVP …
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Compositional Effects on the Chemorheological Properties and Forming Behavior of Aqueous Alumina-Poly(vinyl Alcohol) Gelcasting Suspensions
Gelcasting suspensions were used as feedstock for solid free-form fabrication (SFF) of ceramic components. The influence of processing conditions (e.g., tip diameter, mixing rate, table speed, etc.) and suspension rheology on deposition behavior was investigated. Continuous printablity was achieved …
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Poly(vinyl alcohol) based hydrogen-bonded multilayers : from pH-controlled multi-stage dissolution to zwitter-wettable surfaces
… govern the structure and function of synthetic polymer thin films is of fundamental and practical significance for developing a diverse range of functional surfaces including antifogging coatings, switchable surfaces and stimuli-responsive hydrogels. The first part of this thesis is focused on …
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Preparation and characterisation of poly (vinyl alcohol)/chitosan/silicon dioxide (PVA/CS/SiO2) beads for the chromium (VI) (Cr(VI) removal
… (Cr(VI)) from wastewater. In this study, blend polymer absorbent beads which was poly (vinyl alcohol)/chitosan/silicon dioxide (PVA/CS/SiO2) beads were prepared by dropwise method by crosslinking with sodium hydroxide and ethanol and further crosslinked with glutraldehyde for the purpose of …
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Energy Transfer Among Fluorescent Molecules Dispersed in Thin Films of Polymer or Protein (Rhodamine B, Sulforhodamine 101, Polyvinyl, Poly (Vinyl Alcohol) Bovine Serum Albumin, Time-Correlated Photon Counting, Lifetimes)
… spectra, a system of RHB molecules dispersed in poly(vinyl alcohol) (PVOH) can collect light energy and transfer the energy of the excited state, or exciton, among the RHB molecules and to trap sites. Such a system could be technologically useful if it can improve the effectiveness of proposed …
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Temperature and Water Responsive Shape Memory Polymers for Soft Tissue Expansion
A biodegradable thermoplastic shape memory polymer which can be used for 3D printing patient specific soft tissue expanders was synthesized and characterized. The bottlebrush polymer with Poly (vinyl alcohol) backbone and polyurethane side chains exhibited shape memory effect. Using an …
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Processing-property characteristics of a polymer-cement composite
… attributes of hardened calcium aluminate cement-poly(vinyl) alcohol (CAC-PVA) composites. Effects of cement particle size and polymer molecular weight were also investigated.
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Towards a carbon nanotube antibody sensor
… single-walled carbon nanotube (SWNT)/polymer-protein A complexes for optically reporting antibody concentration via a change in near infrared fluorescent emission after antibody binding. SWNT have potential as biosensors because of extraordinary sensitivity, lack of photobleaching, and …
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Development and application of novel capillary electrophoresis techniques for analysis of DNA fragments and organic pollutants
… field-amplified sample stacking procedure in a poly(vinyl alcohol)-coated capillary, and an improved offline cationic surfactant-assisted solid-phase extraction method were developed for sensitive analysis of herbicides. Besides, simultaneous analysis of 2 groups of acidic pollutants in …
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Preparação e caracterização de blendas formadas por goma xantana e poli (alcóol vinílico) para aplicação na área de liberação controlada de fármacos.
Polymer blends are a quick and economical way to obtain materials with modular properties and achieve different properties desired in the design of controlled release of drugs in order to meet the therapeutic needs systems. The objective of this work was the preparation and characterization of …
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Mixed ion and electron conducting polymer composite membranes for artificial photosynthesis
… semi-interpenetrating networks of crosslinked poly(vinyl alcohol) (PVA) and a polycation miscible with PVA. It is analogous to aqueous strong base solution. The polycation is a OH- containing polymer; PVA solvates this polycation and facilitates the ion conduction via Grotthuss mechanism. The …
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Elastic stiffening in PVA-Borax studied with experimental medium amplitude oscillatory shear
… often observed in transient or associative polymer hydrogels; specifically, Poly(vinyl) alcohol (PVA) crosslinked with Sodium tetraborate (Borax), or PVA-Borax. We use medium amplitude oscillatory shear (MAOS) as a tool to measure asymptotically nonlinear viscoelastic material functions …
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Síntese e caracterização de filmes de polietileno/poli(álcool vinílico) contendo nanopartículas de negro de fumo e sílica
High density polyethylene (HDPE) is widely used in the production of automobile fuel tanks due to low density and processability, despite being permeable to organic solvents. In order to improve their barrier properties, the aim of this work was study the synthesis and characterization of HDPE and …
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