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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 16 of 16 for “"Plastics Technology"”.
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'I Heard Beauty Dying': The Cultural Critique of Plastic in Gravity's Rainbow
… license that allows him to attribute the rise of plastics technology and consumer capitalism to purposely evil entities (like his fictional versions of real-life corporations IG Farben and Shell Oil), Pynchon is able to deliver a narrative that locates the roots of contemporary problems in the …
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Modeling Preform Manufacture and Mold Filling for Resin Transfer Molding
These mathematical models for preform manufacture and mold filling should help engineers to design parts and tooling, optimize operating conditions, and shorten the time required to produce low-cost, high-quality net-shape RTM parts.
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Polymer Chemistry for Improved Self -Healing Composite Materials
… made to this original material. An improved technology is described which protects and delivers the catalyst within wax microspheres. This technique leads to greatly reduced required loadings of catalyst. Faster polymerizations occur when the original endo-dicyclopentadiene is replaced with …
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Inspection of Defects in the Seal Region of Flexible Food Packages Using the Ultrasonic Pulse -Echo Technique
In conclusion, techniques developed in this study will provide safety assurance of the flexible food packages and make these packages more financially competitive by reducing inspection costs.
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The Fracture Behavior and Mechanical Performance of Biodegradable Cornstarch Plastic Composites
… as anti-crack agents in high-amylose starch plastics were not obvious, but the tensile strength and elastic modulus of the high-amylose cornstarch/cellulose composite were 8106 psi and 201 ksi, respectively, which are greater than those of polypropylene. Comparison of the materials' tensile …
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Measuring and Improving Copper-Polyimide Adhesion
"A contact angle measurement technique has been used to determine the thermodynamic adhesive strength between nano-sized copper clusters and polyimide. The copper clusters are formed under UHV conditions by using mono-layer per minute deposition rates to assist equilibrium cluster formation. Values …
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Slow crack growth and associated plastic deformation in linear medium-density polyethylene
Since the introduction of polyethylene (PE) pipe for use in natural gas distribution about twenty years ago, nearly one billion feet of various grades have been installed in North America. Now more than 80% of all pipe installed for natural gas distribution is made of PE, and this percentage is …
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Some molecular contributions and curing considerations: Physical properties of thermoset network materials
Three topics on the molecular basis of, and processing effects on, thermoset network behavior are investigated: (1) processing thick section prepreg epoxy materials, (2) characterization of the contributions to rubbery elastic behavior and (3) improved epoxy resins through lightly cross-linked …
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Liquid state theory of the local and long wavelength structure and thermodynamic properties of block copolymer liquids
"This work presents a theoretical study of the structure, thermodynamics, and phase behavior of block copolymer melts. First, the formal extension of the liquid state ""polymer reference interaction site model"" (PRISM) theory to AB copolymers is presented. Within a simple ""symmetric"" model, …
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The rheo-optics of shear thickening and structure formation in polymer solutions
Simultaneous measurements of the optical and rheological response of solutions of polystyrene have been made, in-situ, in order to ascertain the connection between structure formation and the phenomenon of shear-thickening. Transient and steady state measurements of the viscosity, dichroism, …
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Optimal design and analysis for polymer extrusion and molding
A manufacturing process design methodology is presented which can be used to improve the production of polymer components manufactured via the extrusion, injection molding, and compression molding processes. The design methodology employs polymer process modeling, design sensitivity analysis, and …
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Compression mold filling simulation for thick, nonplanar parts
A finite element simulation, based on Barone and Caulk's model, is developed to study the compression mold filling over three-dimensional curved surfaces. The effects of charge thickness and surface curvature on the pressure and velocity distributions are examined.
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Prediction of Fiber Orientation During Processing of Short Fiber Composites
The fiber orientation pattern created by the flow of a suspension of short fibers controls the physical and mechanical properties of a short fiber composite material. The orientation of the fibers at any point in the composite plays the role of a structural state variable. Two sets of even-order …
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Fiber orientation in injection-molded composites: A comparison of theory and experiment
Experimental measurements of fiber orientation are reported for two parts injection molded from nylon 6/6 reinforced with 43 weight percent of glass fibers. The parts are a center-gated disk and a film-gated strip. Orientation is measured from polished cross-sections and reported as a function of …
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Morphology and crystal structure of random, main chain, semi-flexible, thermotropic liquid crystal polymers
"The crystal structure and morphology of 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 …
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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 …