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 28 for “"Cross-link density"”.
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Cell-seeded type II collagen scaffolds for articular cartilage tissue engineering
… this thesis were to evaluate effects of scaffold cross-link density and bioreactor culture environment on chondrogenesis in cell-seeded type II collagen scaffolds in vitro, and to begin to test effects of implant compositional maturity (viz. glycosaminoglycan, GAG, content) on chondral defect …
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Physical analysis of collagen-GAG composite scaffolds for nucleus pulposus tissue regeneration
… to determine final composition. Chemically cross-linked scaffolds were analyzed to determine pore size and cross-link density. It was determined that every material type contained large enough pore size (275 gm) to seed nucleus pulposus cells and mesenchymal stem cells. The addition of CS to …
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Nitrate Selective Electrodes Containing Immobilised Ion Exchangers
… astingt echniqueg ave rise to a relatively low cross-link density, two sided response and poor thickness control. The developmenot f a hot pressingt echniquer esolveda ll thesep roblemsa nd would readily suit large scale manufacturing. In this work poly (acrylonitrilebutadiene)( NBr) was …
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The Effects of Electron Radiation on the Glass Transition Temperature of a Polyetherimide
… occurred for a dose of 100 MGy. The cross-link and chain scission densities in the irradiated PEI were determined using infrared spectroscopy. The cross-link density increased with dose for all doses investigated. The chain scission density increased with dose for doses up to 75 MGy, …
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Cross linked sulphonated poly (ether ether ketone) for the development of polymer electrolyte membrane fuel cell
… of mechanically stable and highly durable cross linked sulphonated PEEK for fuel cell application. The formation of cross linking was confirmed by solvent extraction using the well known Charlsby–Pinner equation. The DSC results indicated that the cross links retard the crystallization, but …
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The fatigue ageing of vulcanised rubbers
… network morphology. The network structure and cross-link density of the elastomers in the blends and the addition of carbon black and antioxidant are all found to influence the fatigue resistance but not the failure mechanism of the vulcanisate.
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Acrylamide Based Hydrogels for Continuous Wear Contact Lenses
… groups within the polymer network, the cross-link density, and the conditions of polymerization has been undertaken. In addition to this, a number of potential methods for producing a hydrogel surface having a reduced tendency for spoilation by protein deposition will be outlined, …
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NMR of elastomers and biological tissues
… van Vleek moments, which are more sensitive to cross-link density, were measured, model free, without the interference originated from static and radiofrequency magnetic fields, or local susceptibility. The mixed echo decays, which are characterized by 1H residual second van Vleck moment, …
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Compressive Mechanics Of A Poly (Vinyl Alcohol)-Based Hydrogel System For The Replacement Of The Knee Meniscus
… study and was examined as a function of the cross link density and the polymer content. The modulus of hydrogels was obtained in unconfined compression, first at a strain rate slow enough to ignore fluid flow in and out of the gels, and subsequently at a physiological strain rate of walking. …
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Behavior of passaged chondrocytes in collagen-glycosaminoglycan scaffolds : effects of cross-linking, mechanical loading, and genetic modification of the scaffold
… chondrocytes in the CG scaffold. Scaffold cross-linking procedures increased cross-link density and scaffold stiffness and increased resistance to cell-mediated degradation and contraction as follows: dehydrothermal treatment (DHT) < ultraviolet irradiation (UV) < gluteraldehyde (GTA) < …
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Cure of aqueous phenol-formaldehyde resin at elevated water vapor pressures
… the glass transition temperature and the cross-link density of the cured resin-network decreases. Considerable differences in the morphology of the network were found using SEM. Thus, it can be established that during the curing process under elevated water vapor pressures of a liquid …
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A Study of Thiol Based Bound Antioxidants in Acrylonitrile-Butadiene Rubbers
… PAPT and PPPT increased the rate of cure and cross-link density while BHBM reduced the latter. Conventional oxygen absorption, oven ageing and stress relaxation measurements and in addition a cyclic oil/air test specifically designed for nitrile rubber, in which the mechanical properties were …
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The synthesis and development of novel, easily processable poly (n-isopropylacrylamide)-based hyrdogels.
… hydrogel liquid (PCPH) spontaneously forms a cross-linked hydrogel that does not re-liquefy upon re-heating, but instead, possesses all of the highly utilisable stimuli-responsive properties typical of PNIPAM-based nanocomposite hydrogels synthesised in situ. This novel methodology …
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Advanced simulations of cross-linked thermoset and conjugated polymers for multifunctional applications
… coarse-grained molecular dynamics (CG-MD), density functional theory (DFT), and machine learning (ML) to investigate and optimize cross-linked thermosets and conjugated polymers (CPs). The first part of this study utilizes CG-MD simulations to explore how cross-link density (c) and additive …
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Moderne Festkörper-NMR an Funktionspolymeren
… with all methods a linear dependence with the cross-link density of the elastomers. The extrapolation of the linear fits shows furthermore, that the direct dipolar interactions even without cross-linking are not reduced to zero. This quantitative analysis enabels the rubber industry to …
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Progress Toward Durable Icephobic Materials
… porous surfaces (SLIPS) via polymer cross-linking at the interface, copolymerization of commercial poly(dimethylsiloxane) resins with acrylate / styrene monomers yielding highly cross-linked network copolymer coatings, and lowering ice adhesion on commercially available adhesive films …
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Characterization of graphite polyurethanes composite from renewable based oils
… (UV-Vis), Fourier Transform Infrared (FT-IR), Density Test, Tensile test and cross-link density. The renewable polyurethane is namely as PU and polyurethane graphite is namely as PG2, PG4, PG6, PG8, PG10 with subscript numbers indicate the weight loading of graphite content was varied in the …
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Beam profile characterization of light-emitting-diode curing units and its effect on polymerization of a resin-matrix composite
… was used to investigate DC, microhardness and cross-link density (CLD) within 5×5×2 mm specimens at various depths; top, 0.5, 0.7, 0.9, 1.1, 1.3,1.5 mm and bottom. The localized irradiance correlation with its corresponding DC, microhardness and CLD was explored, and localized DC correlation …
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Design of aromatic thermosetting polyester composites for thermally stable devices
… immense range of tailorability both in terms of cross-link density and constituent monomers. In this thesis, firstly, new aromatic monomers, such as resorcinol diacetate and 3, 5-diacctoxybenzoic acid, are employed in the synthesis of ATSP oligomers. These have the effect of reducing condensation …
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Release of antimicrobial compounds from glass-ionomer dental cements
… ions, especially Al3+, would result in slower cross-linking processes and lower cross-link density matrix. Additionally, adsorption properties of surfactants to GI aluminosilicate glass particles can also lead to reduction in the number of available active sites on the glass which can react …
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