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 25 for “"Poly(vinyl chloride)"”.
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Morphology-Property Relationships in Polymers: Poly(vinyl Chloride) and Polybutene-1 (Polyvinyl)
… by various methods were characterized. The (as polymerized) virgin polymer is higher in crystallinity than following normal melt processing. Crystallinity determined by x-ray and Fourier transform infrared (FTIR) is in good agreement when appropriately calculated. Two exothermic and two …
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Rate-dependent deformation behavior of poss-filled and plasticized poly(vinyl chloride)
Polymers are known to exhibit strong time-dependent mechanical behavior. In different temperatures or frequency regimes, the rate sensitivities of polymers change as various primary and secondary molecular mobility mechanisms are accessed. The incorporation of nanoparticles can potentially alter …
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The impact of improved materials in poly(vinyl chloride)-based endotracheal tubes
… interaction between epithelial cells and current poly(vinyl chloride)-based ET materials, as well as some ET samples embedded with materials intended to improve biocompatibility properties of the tubes. Cells were grown in wells with small samples of ETs and proliferation and migration were …
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Production and characterisation of poly(vinyl chloride) (PVC) hollow fibre membranes for gas separation applications
… present work was focused in the development of polyvinylchloride (PVC) hollow fibre membranes suitable for gas separation applications using the dry/wet phase inversion technique.The first part of this work involved the preparation of quaternary polymer solutions containing polyvinylchloride …
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The Vibrational Spectra of Chlorosubstituted Hydrocarbons
… in the understanding of the properties of poly (vinyl chloride).<br/><br/>The physical properties of poly (vinyl chloride) and the capacity to fabricate various products depends on detailed structure and conformation of the polymer chain. Conformational content of model compounds by …
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Triptycenes as a molecular building block to introduce internal free volume in organic materials
… system and works for both liquid crystalline and poly(vinyl chloride) hosts.
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Surface coating deterioration studies
… to a pollutant gas (in this case nitric oxide). Poly(vinyl chloride) (PVC) plastisol surface coatings have been exposed to natural and artificial weathering and a comparison of the effects of these two types of weathering has been made by use of various analytical techniques. These techniques …
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Reflectance and Related Studies of The Weathering of Surface Coatings
… class of coatings - namely, those based on poly (vinyl chloride) (PVC) - including the roles played by the various additives present in the system. Finally, in addition to both the natural and artificial weathering tests which have been conducted at various outdoor sites and under various …
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Development of Commercial Applications for Recycled Plastics Using Finite Element Analysis
… plastics blends are: pop bottles made of PolyethyleneTeraphthalate (PET), milk jugs made of High-Density Polyethylene (HDPE), Vinyl seats made of Poly Vinyl Chloride (PVC) and small amount of Polypropylene (PP) and Urethane, electronic scrap made of engineering resins like …
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Factors affecting the metabolism and toxicity of DEHP
… Phthalates are chemicals that are added to Poly vinyl chloride (PVC) to make them soft and flexible. PVC is synthetic polymer, widely used in medical devices such as; blood bags, intravenous tubing and intragastric feeding equipment. During use, DEHP leaches out of the devices into the …
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Polyolefin plastomers in composites for flooring applications
… flooring applications, calcium carbonate-filled poly(vinyl chloride), PVC, has long been the material of choice for both flexible sheeting and tile products. However, PVC-based formulations must be processed with plasticizers, which have recently raised some concerns from a sustainability point …
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Surface and interphase studies of the adhesion of a siloxane- modified-polyimide coating on metals
… profile studies of a siloxane modified polyimide, BDS [BTDA (3,3\4.4'~ benzophenonetetracarboxylic dianhydride) ~ DDS (3.3'~diaminodiphenyl sulfone) - PSX (polydimethylsiloxane) copolymer], used as a coating material. The BDS coating surface can be modified by pretreatment in an alkaline …
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The modification of fuel cell-based breath alcohol sensor materials to improve water retention of sensing performance
… due to the thin characteristics of the material. Poly-vinyl chloride (PVC) membranes showed improved performance over Nafion, while composites of PVC and sulfonated silica showed performance that matched that of the commercial PVC, whilst using significantly less water. Finally, the catalyst layer …
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Automated techniques for surface coating deterioration studies
… for use in accelerated ageing studies involving polymer based surface coatings. These techniques were required in order that the effects of low concentrations of pollutant gases, specifically nitric oxide, on surface coatings could be investigated with a reasonable degree of precision. As part of …
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An Evaluation of Tellurium Compounds as Polymer Stabilisers
… and their ability to act as stabilisers for poly (vinyl chloride) (PVC) and polypropylene (PP) assessed. Molecular weight measurements and mass spectra data indicate that diphenyl tellurium maleate and diary tellurium β-mercaptopropionate exist as dimers, whilst in the case of …
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Capacitive Touchscreen Sensors for the Measurement of Ions in Electrolytes
… with the touchscreen prototype. Thin polymer coatings turn out essential for measuring electrolytes via the projected mutual capacitance. The touchscreen senses a tight semi-log correlation of its capacitance with the conductivity of electrolytes below 100 μS/cm. This correlation is …
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Laser induced emission spectrometry for rapid elemental analysis.
… are devised including the survey analysis of polymeric materials and the depth profiling of coated steels. A survey analysis of polymeric materials for twelve elements (Al, Ba, Ca, Cu, Fe, Mg, Pb, P, Sb, Sn, Ti and Zn) is reported. Results showed that element emission responses are dependent …
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Development of supercritical processes for particle coating / encapsulation with polymers
… from 20 nanometers to 500 microns with different polymers. Particle coating using different supercritical technologies of a modified rapid expansion of a supercritical solution (RESS) for particle coating and a supereritical antisolvent (SAS) process was described. In the modified RESS process for …
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Development of Scalable and Sustainable Processes for Polymer Recycling, Upcycling, and Synthesis
… plastic waste crisis. Yet, chlorinated plastics, polyvinyl chloride (PVC) in specific, are often left out of the circularity conversation, despite PVC being the third most produced plastic worldwide. This dissertation discusses the challenges facing chlorinated plastics, but also the unique …
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An artificial skeletal muscle for use in pediatric rehabilitation robotics
… Coiled Nylon Fiber, Ethanol-Based Phase-Change, Poly Vinyl Chloride Gel, Stacked Dielectric Elastomer and Hydraulically Amplified Self-Healing Electrostatic. ☐ In Aim 2, the electro-mechanical properties of a commercially available CTsystems’ stacked DEA (CT-SDEA) were benchmarked. CT-SDEA …
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