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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 644 for “"polystyrene"”.
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The thermal degradation of polystyrene.
A review is made of the thermal degradation of polystyrene. In a theoretical study the importance of intramolecular transfer during degradation is emphasized in the formation of oligomeric volatiles. To account for past experimental results a mechanism is proposed involving biradical cage …
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Rheology of molten polystyrene with dissolved gases
… theoretical modeling are presented for molten polystyrene with dissolved gases, including carbon dioxide, 1,1-difluoroethane (R152a), and 1,1,1,2- tetrafluoroethane (Rl34a), which are considered to be environmentally acceptable for replacing previous ozone-depleting hydrochlorocarbon (HFC) …
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Understanding Structure-Property Relationships for Impact Polystyrene
The understanding of impact polystyrene structure-property relations was previously limited to ex situ analysis. Developing in situ analysis methods for morphology development and interfacial tension characterization would enhance fundamental understanding of the multi-component, multi-phase impact …
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Characterization of polystyrene-block-poly (acrylic acid) micelles
Several parameters that affect the formation, size and spatial distribution of micelles of poly(styrene-block-acrylic acid) (PS-b-PAA) in organic solvents or assembled on solid substrates have been investigated. The micelles were characterized in the solvated state using Dynamic Light Scattering, …
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Extraction of Additives from Polystyrene and Subsequent Analysis
… and antistats from eight formulations of polystyrene is demonstrated and compared to traditional dissolution/precipitation extractions. The purpose of the study was twofold: 1) the development of a high performance liquid chromatography (HPLC) method(s) for the additives and 2) the …
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Comparison of Silica Polyamine Composites and Crosslinked Polystyrene Resins
… BPAP, and CuWRAM, with their closest crosslinked polystyrene resin analogs. The studies undertaken consisted of tests of industrial relevance: metal ion capacity, pH dependence of capacity, mass transfer kinetics, metal ion selectivity, and the efficiency of recovering the metal from the …
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Comparison of Silica Polyamine Composites and Crosslinked Polystyrene Resins
… BPAP, and CuWRAM, with their closest crosslinked polystyrene resin analogs. The studies undertaken consisted of tests of industrial relevance: metal ion capacity, pH dependence of capacity, mass transfer kinetics, metal ion selectivity, and the efficiency of recovering the metal from the …
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Polystyrene coated iron-platinum drug delivery platforms for theranostics
… their stability in biological systems.5 The polystyrene coating was optimized to produce an overall size of approximately 12 to 30 nanometers. The magnetic characteristics of the coated FePt nanoparticles were analyzed by MRI. Dynamic light scattering (DLS), transmission electron microscopy …
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The conversion of citronellal over sulphonated polystyrene resin catalysts
Citronellal was converted over sulphonated polystyrene resin catalysts of different acid loading. The catalysts had been prepared sulphonating a commercial polystyrene resin with sulfuric acid. Catalyst activities were screened in the liquid phase and in the gas phase in a temperature range of 50 …
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A study of the crystallization kinetics of isotactic polystyrene
… data for a molecular weight series of isotactic polystyrene are analyzed in context of the Lauritzen-Hoffman kinetic theory of polymer crystallization. The primary objectives of the study are to critically test the Lauritzen-Hoffinan theory under conditions not rigorously investigated before and …
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Modification and Upcycling of Polyetherimide, Polystyrene, Polyethylene, and Polypropylene
… of Deg-Up is evaluated on three plastics: polystyrene (PS), polyethylene (PE), and polypropylene (PP). These plastics serve broad applications in daily life, such as Styrofoam, food containers, shopping bags, garden decorations, and furniture. PEI, a powerful plastic resilient to high …
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Electron beam irradiation of polystyrene/poly(vinyl methyl ether) blends
… beam radiation on the rheological behavior of a polystyrene/poly(vinyl methyl ether) blend as a function of absorbed dose, composition, and temperature, were investigated. The purpose of this research has been to modify the viscosity of polystyrene by studying the influences of the addition of a …
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Synthesis and characterization of poly(2,2,2- trifluoroethoxyphosphazene)polystyrene graft copolymers
Poly[bis(2,2,2-trifluoroethoxyphosphazene)]-polystyrene graft copolymers were synthesized by a “grafting onto" reaction which involved a reaction between two preformed, reactive polymer chains. In this case, poly(dichlorophosphazene) was the reactive polymer backbone onto which approximately 10 …
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Investigating lipid corona formation onto polystyrene nanoparticles through fluorescence correlation spectroscopy
… on exposure of lipid vesicles to different polystyrene nanoparticles indicate possible formation of a lipid corona. Further study varying the nanoparticle charge and lipid vesicle fluidity can help elucidate the mechanism of lipid corona formation. Such work can provide insight into …
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Electrostatic, electrokinetic, and ordering properties of concentrated suspensions of polystyrene latex
The electrokinetic properties of polystyrene latexes are investigated and data reduction indicates that surface charge regulation occurs through the adsorption of ions from the suspending medium. An independent non-electrokinetic method of determining ionic adsorption is developed confirming these …
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The synthesis and characterization of polystyrene liquid crystalline siloxane block copolymers
Di block copolymers of polystyrene and side-chain liquid crystalline siloxanes have been prepared with a wide range of molecular weights (Mn total from 20,000 to 144,000) and liquid crystalline siloxane weight fractions (0.4 - 0.9). A new synthetic technique was developed to synthesize these …
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Control of surface interactions with ultra-violet/ozone modification at polystyrene surface.
… technique of Ultra-Violet/ Ozone to improve the polystyrene biocompatibility by oxidising the surface with additional polar oxygen functional groups without damaging the surface bulk property. UV/Ozone treatment utilised throughout this study produced controllable oxygen functional groups and led …
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