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 6 of 6 for “"Cell Nucleation"”.
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Mechanisms of Cell Nucleation, Growth, and Coarsening in Plastic Foaming: Theory, Simulation, and Experiment
… highlights a comprehensive research for the cell nucleation, growth and coarsening mechanisms during plastic foaming processes. Enforced environmental regulations have forced the plastic foam industry to adopt alternative blowing agents (e.g., carbon dioxide, nitrogen, argon and helium). …
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Solid-state Polymer Nanofoams
… which are expected to be the next generation cellular materials, have attracted much attention in the past decade. Nanoscale dimension of the bubbles could potentially render the nanofoams to have improved properties or some novel properties never observed before. There existed substantial …
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Synthesis and analysis of a microcellular plastics extrusion system for insulation of fine wires
… work performed on the extrusion of microcellular plastics with cell sizes of 20 microns or less and cell densities of about a billion cells per cm3. An analytical model of cell nucleation and cell growth during extrusion was developed. This model predicts the nucleation rate by taking …
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Relationships between material properties and microstructure-mechanical attributes of extruded biopolymeric foams
… the foaming process in terms of expansion, cell nucleation, and resultant foam microstructure, which, in turn, control mechanical properties. This study utilizes non-invasive x-ray microtomography (XMT), in combination with mechanical testing and novel phase transition analysis techniques, …
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Reactive modification and crystallization behavior of foamed poly(butylene terephthalate)
… g/cc and showed high expansion ratio of 4.0 and cell structure resistant to coalescence. The possibility of overlap of the polymer crystal formation with the nucleation/growth of gaseous cells was investigated based on theoretical predictions. Slow pressure drop rate was shown to decrease cell …
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Biopolymer foams from Novatein thermoplastic protein and poly(lactic acid)
… during bubble growth and hold the newly formed cellular structure. The low melt strength of Novatein, however, make it difficult to induce a cellular structure in the proteinous bioplastic. Therefore, the foaming ability of Novatein can be improved by blending with PLA, which can successfully be …