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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 44 for “"Polyolefin"”.
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Thermodynamic Interactions in Polydiene/Polyolefin Blends
… interactions in blends of polydienes and polyolefins were investigated using small angle neutron scattering (SANS). Model polydienes with controlled molecular weight, dispersity, and precise chemical structure were synthesized using anionic polymerization, and subsequently saturated with …
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Polyolefin plastomers in composites for flooring applications
… calcium carbonate-filled formulations based on polyolefin plastomers, POP, are prepared in a laboratory-scale mixer, and their mechanical properties are studied for flooring applications. Plastomers are olefin copolymers synthesized using new metallocene catalyst technologies. The POP plastomer …
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Predictive Modeling of Metal-Catalyzed Polyolefin Processes
… polymer process models for metal-catalyzed polyolefin processes. The significance of this work is that it presents a comprehensive approach to polymer process modeling applied to large-scale commercial processes. Most researchers focus only on polymerization mechanisms and reaction kinetics, …
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Viscoelastic and fracture behaviour of polyolefin based nanocomposites
In the last years it has been widely proven that the introduction of very small amounts of inorganic nanoparticles in polymeric matrices can lead to noticeable improvements of their mechanical properties, in terms of elastic modulus and tensile properties at yield and at break. Linear low density …
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Development of synthetic methodologies for polyolefin containing block copolymers
The student, Tianwei Yan, submitted this Dissertation for approval on 2021-03-29 at 19:56.
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Integrated Process Modeling and Data Analytics for Optimizing Polyolefin Manufacturing
Polyolefins are one of the most widely used commodity polymers with applications in films, packaging and automotive industry. The modeling of polymerization processes producing polyolefins, including high-density polyethylene (HDPE), polypropylene (PP), and linear low-density polyethylene (LLDPE) …
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Machine Learning and Multivariate Statistics for Optimizing Bioprocessing and Polyolefin Manufacturing
… cases associated with the manufacturing of polyolefins, particularly LDPE (low-density polyethylene) and HDPE (high-density polyethylene). Through these cases, we showcase the usage of machine learning and multivariate statistical tools to improve process understanding and enhance the …
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Accessing Model, Functional Polyolefins and Polyolefin Copolymers with Ring-Opening Metathesis Polymerization
Polyolefins are the most widely used commercial polymer available due to their low cost and excellent properties. Functionalized polyolefins with polar functional groups are desirable targets for more complex materials benefiting from the excellent properties of polyolefins, but these materials are …
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Upcycling of Polystyrene, Polyolefin, and Polyvinyl Chloride Waste into Chemicals, Surfactants, and Lubricants
… and upcycling" approach is applicable to polyolefins and can be employed to design a synthetic strategy to produce surfactants from PE and PP waste, thus helping to improve the circularity of the polymers. In the first reaction, the polyolefins are degraded into olefin-rich intermediates …
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Influence of Polyolefin Contamination on the Thermal Characteristics of Bottle Grade Recycled Polyethylene Terephthalate
… of bottle grade PET, cross contamination with polyolefin is inevitable. Very small number of polyolefin bottles, caps and closures pass through the separation process and get recycled with PET bottles and affect the final characteristics of the recyclate. The effect of this cross contamination …
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A feasibility study of a surface modification method for polyolefin plastics formed by injection molding
<p>Polyolefin plastic (i.e. polypropylene, polyethylene, thermoplastic olefin i.e. TPO and blends) articles formed by injection molding have been found to have many useful applications. Many costly and/or hazardous methods are employed to increase the surface energy to a level that promotes the …
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Novel Functional Graphene and its Thermodynamic Interfacial Localization in Biphasic Polyolefin Systems for Advanced Lightweight Applications
… Polypropylene (PP), in a macro-micro biphasic polyolefin system, with PE representing the macro phase. An alternative and inexpensive Graphene Oxide (GO) modification is performed for synthesizing a novel functional graphene. Then, a thermodynamically driven mixing mechanism of the three …
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Numerical Investigation of Particles Breakage and Growth in Gas-Solid Processes: Spiral Jet Milling and Polyolefin Polymerization in Fluidized Bed Reactors
L'abstract è presente nell'allegato / the abstract is in the attachment
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Advancing plastics reutilization via catalytic hydroconversion
… is an attractive alternative to reutilizing polyolefins by converting them into valuable chemicals and fuels. Hydroconversion processes, including hydrocracking and hydrogenolysis, are promising for chemical recycling polyolefins to C1-C30 alkanes that can be utilized in petroleum refineries. …
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The preparation of high performance polymers for composites and blends: A) thermally stable ion containing polymers B) epoxy and hydroxy functional polyolefin macromers
… the synthesis and characterization of a polyolefin macromer, and it's incorporation into a polyester is detailed. These macromers, and the graft polymers resulting, have applicability in the area of polymer blend compatibilization.
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End-Group Modified Hyperbranched Polyetherimides and Their Blends With Linear Polymers
… of alkyl chain increased compatibility with a polyolefin matrix (PE). While no processing advantage was observed by the incorporation of HBPs, polyethylene tapes were toughened at very low loading levels.
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Versatile Strategies for Multifunctional Polyolefins
Polyolefins have quickly become one of the world’s most utilized products since their discovery in the 1950s. With 350 million tons produced each year, it is clear that the use of polyolefins is not subsiding in the near future. Instead, it is imperative to develop novel materials that are more …
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Self-Condensing Ring-Opening Metathesis Polymerization
… (ROMP) is a great tool for synthesizing polyolefin materials with different topologies, including hyperbranched polymers—polymers with high degrees of branching and many end groups. However, hyperbranched polymer synthesis via ROMP is challenging due to multifunctional-monomer or …
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The role of stable nitroxyl radical precursors as antioxidants in polyolefins
… peroxide as bound-antioxidant masterbatches for polyolefin stabilisation. It was found that grafting of the antioxidant monomers onto the polymer backbone was inevitably in competition with homopolymerisation of the monomers as well as melt degradation of the polymer and other side reactions. As …
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Neue fluorhaltige und fluorophile Katalysatoren für die lebende Olefinpolymerisation, die radikalische Atomtransferpolymerisation und die Synthese von Blockcopolymeren
… erhalten werden. An diesen Katalysatoren wurden Polyolefin- und Polystryol-Blockcopolymere hergestellt. Dabei diente die Substitution mit Fluoratomen bzw. perfluorierten Gruppen sowohl der Steuerung der durchgeführten Blockcopolymersynthesen als auch dem Recycling des eingesetzten Katalysators. …
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