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 65 for “"propylene glycol"”.
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Ion Transport, Viscoelastic, and Thermal Properties of Several Poly(Ethylene Glycol) and Poly(Propylene Glycol) Based Polymer Electrolytes
This dissertation explores the relationship between ionic conductivity, viscosity, and thermal properties of several MePEG and MePPG based copolymer electrolytes. In particular two main copolymer modifications have been investigated namely copolymerization with "bulky groups" and cross …
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Interaction of Metal Salts with Polyethers
… low to medium molecular weight poly(ethylene glycol) and poly(propylene glycol) and a variety of their salt complexes have been studied through the measurement of the dielectric permittivity and dielectric loss over a range of frequency and temperature. The major proportion of this study has …
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Interspecies Pharmacokinetic Scaling and Metabolism of Alcohols and Glycols
… pharmaceutical applications of alcohols andglycols, the interspecies differences with respect to their pharmacokinetics (PK) arepoorly understood. The aim of this research was to use in-vivo and in-vitro approaches to compare and model the PK characteristics across various species.Methods: …
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Evaluation of Existing Subsurface Cooling Systems Worldwide and Development of Efficient Cooling Methods and Systems Based on Renewable Energy Sources
… the practical use of low-pressure, chilled propylene glycol, which has a freezing point of -68 °C, in a closed circuit as the source of cooling the intake air for deep and hot mines. Air-cooling power is available by means of passing intake airflow across plate heat exchangers through which …
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Studies on the Formulation of Topical Corticosteroids
… decomposition pathway parallel those in aqueous propylene glycol. Steroid gels with a shelf-life of about one year were formulated. The percutaneous absorption of hydrocortisone and its 17- and 21-butyrates and 21-acetate were studied using three in vitro models which enabled simultaneous …
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The economics of sugar hydrogenloysis for the commercial production of an automotive antifreeze
… The products of the hydrogenation were water, propylene glycol, glycerol and congeners, and a residue made up of the tarry decomposition products of sugar. The actual glycerol and congeners fraction obtained by Lenth and DuPuis was secured from the Miner Laboratories in Chicago. This impure …
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Autonomous Small Scale Data-logger for Temperature Mapping
… exposure to chemicals such as Isopropyl Alcohol, Propylene Glycol, and De-Ionized water for a period of 2 hours with accuracy of ±0.5oC. The hydration process used for contact lens manufacturing is proposed as a target application for the developed system. The developed system was bench top tested …
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Voltage induced spreading and liquid optical devices
… spreading of a stripe of the material 1,2 propylene glycol. In the limit of thick droplets, a theoretical prediction has been derived that the cosine of the static equilibrium contact angle is proportional to the square of the amplitude of the voltage applied to the inter-digital …
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Behavior of the Embedded Phase in a Shock-Driven Two-Phase Flow
… moving shock wave in a shock tunnel. Liquid propylene glycol droplets are pre-mixed with air, and slowly injected into the test section of the shock tunnel. Two test sections are evaluated during the course of this study. Each test section is constructed of square, transparent polycarbonate …
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Methods for management of Tyrophagus putrescentiae (Schrank) (Sarcoptiformes: Acaridae) in dry-cured ham facilities
… pieces in solutions of various food additives. Propylene glycol (1, 2-propanediol), lard, ethoxyquin and butylated hydroxytoluene prevented or significantly reduced mite population growth. A combination of carrageenan + propylene glycol alginate + 40% propylene glycol was effective in reducing …
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Investigation of the heating and curing rate of polymeric materials with thermal energy, continuous and pulsed microwave radiation
… energy. The heating rate of poly(ethylene glycol) and poly(propylene glycol) has been studied as a function of molecular weight with pulsed as well as continuous microwave radiation, at constant average power. The curing rate of poly(amic acids) have also been studied with thermal energy, …
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Monte Carlo simulation of aqueous dilute solutions of polyhydric alcohols
… The solutes investigated were ethanol, ethylene glycol, 1,2-propylene glycol, 1,3-propylene glycol and glycerol. In addition, propane, which does not hydrogen bond but does form water hydrates, was simulated in aqueous solution. The complex alcohol-water systems are very nonideal in their …
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Critical Quality Attributes of Topical Semi-solid Dosage Forms: Solvent Activity
… contain solvent systems (water, ethanol, propylene glycol, glycerol and liquid chemical permeation enhancers) but the significance of solvent activity (thermodynamic solvent properties) on product performance has not been investigated so far, to be translated into a quality metric system …
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Mass transport in metal-organic frameworks as a limiting step in size-selective oligomerization
… oligomerization catalysis. Using acylated propylene-glycol methyl ethers as model substrates, the mass transport properties of these materials was investigated. Unfortunately, slow mass transport of solvated substrates through pores assumed to be sufficiently large for facile diffusion may …
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Characterization of Structure-Property Relationships of Poly(urethane-urea)s for Fiber Applications
… of spandex employing poly(tetramethylene ether glycol) as soft segments. Recent developments in catalyst technology have resulted in the production of ultra-low monol content poly(propylene glycol) (PPG), which is nearly difunctional (f=1.95+). This enhancement in difunctionality has potentially …
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Apical and radial pH diffusion through root dentin from five modern intracanal medicaments: a twelve-week evaluation of alkaline dynamics
… to five medicament groups: purified water, propylene glycol, methylcellulose in water, silicone oil, or calcium silicate. Standardized cavities were prepared at inner dentin, outer dentin, and two apical sites approximately 3 mm and 6 mm beyond the medicament terminus. Remaining dentin …
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Synthesis and Characterization of Multi-Functional Nanoparticles for Therapeutic and Biosensing Applications
… a matrix consisting of poly(DL-lactic acid-co-glycolic acid) (PLGA) or poly(ethylene glycol)-PLGA and stabilized by polyvinyl alcohol (PVA) or Pluronic F-68 for the encapsulation of an insulin derivative, a model therapeutic enzyme, and anticancer drugs. The protein hormone release from …
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Drug Discovery in Redox Biology: From Natural Products to Structural Biology
… by spectroscopic analysis as vanillin, propylene glycol, β hydroxypropiovanillone, 1,4-bis(2-hydroxyethoxy)benzene, evofolin B, and (+)-syringaresinol. Among these, 1,4-bis(2-hydroxyethoxy) benzene and (+)-syringaresinol exhibited moderate cytotoxic activity against OVCAR3 cells (IC₅₀ = …
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Atlantic Green Chemicals : bio-glycol plants : business plan
… about building and managing three Glycerin to Glycols Plants based on IPD patent that transforms glycerin (a byproduct from bio-diesel production) to Propylene Glycol (PG) using steam and hydrogen. PG has till now been made from fossil fuel in oil refineries. PG is in high demand as de-icing …
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Preparation And Evaluation Of Valacyclovir Hydrochloride Ocular Inserts By Hot Melt Extrusion Technique
… of the polymers and plasticizers (PEG 400 and Propylene glycol) were prepared. The physical mixture was extruded through co – rotating twin-screw Haake MiniLab ThermoFisher ® Scientific extruder. The obtained ocular inserts were cut into dimensions of 4mm×2mm×1mm to have suitable product …
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