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 10 of 10 for “"non-isothermal crystallization"”.
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In-Situ Monitoring and Simulations of the Non-Isothermal Crystallization of FFF Printed Materials
… Avrami model which accounts for changes in crystallization rate due to temperature and multiple crystallization mechanisms. The amount of polymer diffusion, also referred to as the degree of healing, was calculated using a novel incremental diffusion model which accounted for not only …
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Morphological properties of poly (ethylene terephthalate) (PET) nanocomposites in relation to fracture toughness.
… optical microscopy were used to determine the crystallization effects of MLS addition. Non isothermal crystallization kinetics showed that the melting temperature and crystallization temperature decrease as the MLS percent increases. This delayed crystallization along with the irregular …
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Design and Fabrication of Polyvinylidene Fluoride for Triboelectric Nanogenerators
… triboelectrification is a well-known phenomenon for centuries, the underlying physics behind it is still under debate, so a comprehensive study on triboelectrification is needed. Herein, effects of polyvinylidene fluoride (PVDF) friction layers thickness, contact area and porosity on TENGs …
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Study of poly (l-lactic acid)/poly (d-lactic acid) stereocomplex as nucleating agent for poly (l- lactic acid) crystallization
… different cooling rates (5, 15, 25 C/min), DSC non-isothermal crystallization experiments are performed. The results suggest that in the presence of the stereocomplex, the PLLA crystallization temperatures are found to be higher than that of pure PLLA. By annealing PLLA at different temperatures …
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Process/Structure/Property Relationships of Semi-Crystalline Polymers in Material Extrusion Additive Manufacturing
… conditions. In the fourth project, we employed a non-isothermal crystallization model to directly predict the development of crystallinity based on given temperature profiles, whether monitored experimentally or predicted by the heat transfer model. The research documented notable discrepancies …
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Novel Functional Graphene and its Thermodynamic Interfacial Localization in Biphasic Polyolefin Systems for Advanced Lightweight Applications
… almost matching the neat PP ones. Lastly, PE non-isothermal crystallization kinetics are investigated to validate the experimental data. It is shown that the increase in material’s performance is in direct correlation with nucleation-controlled PE crystallization, induced by the synergistic …
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Crystallization Behavior, Tailored Microstructure, and Structure-Property Relationships of Poly(Ether Ketone Ketone) and Polyolefins
… process parameters on semi-crystalline polymer crystallization and final properties. All objectives utilized the advanced characterization technique of fast scanning calorimetry (FSC) using the Mettler Toledo Flash DSC 1. The first half of this work focuses on the high-performance …
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Crystallization behavior of poly (p-phenylene sulfide): kinetics and morphology
The crystallization behaviour of poly (p-phenylene sulfide) (PPS) has been studied. lsothermal rates of bulk crystallization, spherulitic radial growth rates, and nucleation densities were analyzed as functions of molecular weight of PPS, branching agent concentration, and chemical nature of the …
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Crystallization and structure-property investigations of semicrystalline poly(arylene ether) based polymers
This dissertation addresses the crystallization, melting and morphological characteristics of selected high temperature poly(arylene ether) based polymers. The first part deals with the studies carried out on a series of biphenol and hydroquinone based novel poly(ether ether sulfide)s which were …
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Fabrication, Kinetics and Crystallography of Lithium Disilicate Glass-Ceramics
… is to understand the nucleation mechanism and crystallization kinetics of lithium disilicate glasses by in situ and real-time observations of phase transition using X-ray diffraction (XRD) technique with the state-of-the-art synchrotron radiation. In the meantime, it is of interest to …