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 “"Polymer Engineering"”.
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Prehistoric polymer engineering : a study of rubber technology in the Americas
… of Technology, Dept. of Materials Science and Engineering, 2003.
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Functional Polymer Composites for Clinical and Engineering Challenges
… presents the design and development of novel polymers engineered to outperform widely used commercial materials across a range of demanding applications. The central theme of this work is the deliberate tuning of polymer structure, identity, and architecture to achieve targeted functional and …
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Towards Mechanical Reinforcement in Polymer Layered Silicates Nanocomposites of the Second Generation
… was done in collaboration with the Polymer Engineering Department at Bayreuth University in the frame work of SFB 840 (Project B3). The synthetic Na-fluorohectorite clay applied in this thesis differs from conventionally used natural montmorillonites (MMT) in respect to three main …
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Organoapatites: New materials for artificial bone
Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Howard Ding (hding2@illinois.edu) on 2011-05-07T14:34:42Z Item is restricted indefinitely.
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Bulk synthesis of two-dimensional polymers
… the bulk synthesis of two-dimensional (2D) polymers. Two different approaches, the chiral recognition approach and the hairpin approach, have been used for the ""bulk preparation of the two-dimensional polymers""."
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Synthesis and characterization of novel polymer-ceramic nanocomposites: Organoceramics
… the synthesis and characterization of novel polymer-ceramic nanocomposites (organoceramics) based on various water soluble polymers and calcium aluminate hydrates. Synthesis of these materials involves the aqueous precipitation of the inorganic crystals in the presence of polymer. The …
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Morphology and crystal structure of random, main chain, semi-flexible, thermotropic liquid crystal polymers
… random, main chain, thermotropic liquid crystal polymers (LCP's) of equimolar amounts of the following structural units (with n equal to 4, 5, 6 and 7 in ""A"") have been examined by electron microscopy and diffraction:(DIAGRAM, TABLE OR GRAPHIC OMITTED...PLEASE SEE DAI)"
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Preclinical Evaluation of a Novel Polysaccharide Hydrogel for Local Chemotherapy Delivery to Solid Tumors
… during synthesis. Mechanical testing of the polymer network revealed that there was no change in hydrogel structure with the addition of the drug compound. At the optimal murine anti-tumor dose, the drug loaded gel was stable for at least 6 months at room temperature and pressure and ambient …
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Ultrafast Temperature Jump Study of Energy Transfer in Dye-Doped Polymer Films
Ultrafast laser spectroscopy of condensed matter samples containing dyes functioning as molecular optical heaters and optical thermometers is developed. A known amount of heat is deposited in a molecular solid sample and the temperature is accurately measured. This technique, termed ultrafast …
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Processing and microstructure of standard and modified macro-defect-free cements
Evolution of macro-defect-free microstructure and microchemistry was studied by TEM/EDS and SEM/EDS. MDF samples were prepared through an alternative, Banbury mixing route. Experiments with varying mixing time at constant mixing rate showed that an intimate distribution of constituents in the …
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Implications of Diversity: A Study of the Evolution of the Adsorption States of Macromolecules at Surfaces
We study the adsorption of macromolecules from solution onto single solid surfaces, focusing on the evolution of compositional heterogeneity of the layer. The origin and development of adsorption states within the physisorbed layer is noted in both chemically homogeneous and heterogeneous layers …
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The sol-gel polymerization of octamethoxysilsesquioxane
… of various solvents and catalysts on the sol-gel polymerization of [SigOi2](OCHg)g, the polymerization was followed by 29Si NMR spectroscopy, which indicated that the cubic structure of [SigOi2](OCH3)g was retained under initial polymerization conditions. Polymerization under acidic conditions was …
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Polyoxotitanates and their role in titania sol-gel polymerization
Hydrolysis of Ti(OBu$\sp{\rm t})\sb4$ with 1 equiv of water in t-BuOH at 100$\sp\circ$C yielded a new polyoxotitanate complex $\rm\lbrack Ti\sb{18}O\sb{28}H\rbrack (OBu\sp{t})\sb{17}$. A single crystal X-ray diffraction study of its t-BuOH solvate revealed a $\rm Ti\sb{18}O\sb{45}$ metal-oxygen …
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The effect of interchain transesterification reactions on the development of aromatic copolyesters
… properties due to the anisotropic nature of the polymer. In an attempt to address these issues, a new thermosetting polymer based on all aromatic ester units has been developed. The material displays thermal stabilities to 450$\sp\circ$C in nitrogen, glass transition temperatures to …
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Dynamics of polymer melts confined between adsorbing surfaces spaced at molecular dimensions
… dimensions undergoes oscillatory shear. The polymers experience a dynamic liquid-like to rubber-like transition at the onset of long range surface forces $(\sim$4.5 R$\sb{\rm G}).$ The long time relaxations of the polymers are effectively frustrated at the start of the strong repulsive short …
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Polymer Crystallization: Polycarbonate and Polybutene-1
The crystallization of polycarbonate from the glassy state was examined using thin ($\sim$1000A), solution cast films and thicker (0.16 and 1.5 mm) compression molded films. A detailed study of the crystallization process in the thin films, as observed by transmission electron microscopy, revealed …
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Multilayered supramolecular structures: Two-dimensional polymers and polar assemblies
… middle sector, these assemblies yield 2D polymers which should be shape-persistent plate-like molecules. Isolated 2D polymers are stable up to 320$\sp\circ$C, which is at least 143$\sp\circ$C higher than the isotropization temperature of their precursor monomer.
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Development of and gas permeation study of homo and copolymers from the family of polyphenylene oxides
… on preparation and characterization of new copolymers from the family of polyphenylene oxides. This family of polymers was chosen because of the properties of its best-known representative, poly(2,6-dimethyl-1,4-phenylene oxide), which shows one of the highest rates of permeability for gases …
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Oriented polymer crystal growth from flowing solutions
… flow geometry have been quantified for several polymer systems using digital image processing to observe and monitor the birefringence of the crystallizing fiber. Three molecular weights of polyethylene were studied in 0.01 wt% xylene solutions as well as solutions of polypropylene in decalin …
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A study of transient flow-induced crystallization of polymer melts
Flow-induced crystallization of several polymer systems has been studied using a four-roll mill device, coupled with optical polarimetry, to provide an in-situ technique for monitoring the transformation kinetics both during and following flow. The use of a crystallizable droplet phase, suspended …
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