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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 29 for “"Poly (ethylene terephthalate) (PET)"”.
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Morphological properties of poly (ethylene terephthalate) (PET) nanocomposites in relation to fracture toughness.
… of montmorillonite layered silicate (MLS) on poly (ethylene terephthalate) (PET) matrix was investigated. MLS was added in varying concentration of 1 to 5 weight percent in the PET matrix. DSC and polarized optical microscopy were used to determine the crystallization effects of MLS addition. …
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Recovery of Poly (Ethylene Terephthalate) From used X-Ray Film
… to remove primary contaminants viz silver and poly (vinylidene)chloride (PVDC) coating, from X-ray film and subsequent recovery of poly (ethylene) terephthalate (PET) economically.<br/><br/>The thesis commences with a review of the literature, concerning the recycling and recovery of (PET), …
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Chemical recycle of polyester waste using novel zwitterionic catalysts
Waste poly (ethylene terephthalate) (PET) from drink bottles wasdepolymerized using novel zwitterionic imidazolium-2-carboxylate salts ascatalysts (or catalyst-precursors) in the presence of ethylene glycol viaglycolysis to give bis(hydroxyethyl)terephthalate (BHET). The influence ofreaction …
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Nanoscale properties of poly(ethylene terephthalate) vascular grafts
… replacements for damaged blood vessels. Poly(ethylene-terephthalate), PET, has been successfully used in large diameter grafts; however, small caliber grafts are still a major challenge in biomaterials. Due to surface forces, blood plasma proteins adsorb to the graft, resulting in …
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Effect of nano-fibers on the stress-strain behavior of semi-crystalline poly(ethylene terephthalate) at different strain rates
… compression tests were performed on amorphous poly(ethylene terephthalate) (PET), amorphous poly(ethylene terephthalate)- glycol (PETG), semi-crystalline PET, and semicrystalline PET with various amounts of nano-fibers added. The stress-strain behavior for each material at several strain rates …
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The mechanics of strain-induced crystallization in poly(ethylene terephthalate)
Poly( ethylene terephthalate) (PET) is a thermoplastic polymer found in numerous commercial applications. PET exhibits the capability of undergoing strain-induced crystallization during processing, the result of which is increased stiffness and hardness as well as better dimensional stability. An …
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Synthesis and Structure-Property Relationships of Polyesters Containing Rigid Aromatic Structures
Polyesters are an attractive class of polymer that can be readily modified with a wide range of different comonomers, during polymerization or with melt blending, to achieve a wide variety of physical properties. This research primarily focuses on polyesters that incorporate rigid aromatic …
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Sorption Behavior of an Aliphatic Series of Aldehydes in the Presence of Poly(ethylene terephthalate) Blends Containing Aldehyde Scavenging Agents
… of lipids or are introduced as migrants from polymeric packaging material. The objective of this project was to evaluate the effectiveness of three aldehyde scavenging agents, blended into poly(ethylene terephthalate) (PET) films, in removing an aliphatic series of aldehydes from an acidified …
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Experimental studies and modeling of mechanical properties and morphologies of in situ polymer composites
… development and mechanical properties of poly(ethylene terephthalate) (PET)/ liquid crystalline polymer (LCP) blends. Simulations of the injection molded blends at various process conditions were performed using CMOLD. In order to determine the effect of the processing parameters on the …
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Biochemical Analysis of Poly(ethylene terephthalate) Film Degradation Kinetics of Engineered IsPETase Variants
… in waste management and recycling technologies. Poly(ethylene terephthalate) (PET) is a major plastic polymer that is heavily investigated for enzymatic recycling. The presence of the ester bond in the polymer allows hydrolysis via serine esterases, such as cutinases and lipases. However, little …
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Structure-Property Relationships of Polyester Regioisomers and Pendant Functionalized Polyetherimides
Step-growth polymerization enabled the synthesis of novel polyester regioisomers and pendant functionalized polyetherimides (PEI)s. Novel monomers incorporated at targeted mol % produced series of polyesters and PEIs, suitable for systematic analysis of key polymer properties. Subsequent …
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Injection Molding of Pregenerated Microcomposites
… microcomposites composed primarily of poly(ethylene terephthalate) (PET) as the matrix and HX1000 as the thermotropic liquid crystalline polymer (TLCP). Several factors were examined to maximize the mechanical properties of these composites, including injection molding temperature, …
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Transparent Omniphobic Coatings that are Flexible and Wear Resistant
… via the photo-initiated cationic ring-opening polymerization of the epoxide rings of glycidyloxypropyl polyhedral oligomeric silsesquioxane (GPOSS). While the desired hardness is rendered by the silica core of GPOSS, the flexibility is imparted by the glycidyloxypropyl network. In addition, oil …
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Designing High Performing Durable Bio-Based Coatings for Packaging Applications
… packaging applications using renewable biopolymers. These include cellulose, extracted from plants, and chitin, sourced from mushrooms and food waste like crustacean exoskeletons. These natural polymers can form strong, high-performance films but are limited by moisture sensitivity and …
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Non-Covalent Interactions in Polymeric Materials: From Ionomers to Polymer Blends
… as divalent phosphonate. In this dissertation, poly(ethylene terephthalate) (PET) and polystyrene ionomers with divalent phosphonate pendant ions have been synthesized, and the influence of divalent phosphonate pendant ions on the structure-morphology-property relationship has been compared to …
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The Manufacture and Mechanical Properties of Poly(ethylene terephthalate) Fibers Filled with Organically-Modified Montmorillonite
… with mechanical property improvements to poly(ethylene terephthalate), PET, fibers by the addition of layered silicate nanoparticles and by drawing the un-oriented nanocomposite filaments in a second step. No previous studies on PET fibers filled with montmorillonite (MMT) nanoclay …
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Synthesis and Characterization of Multicomponent Polyesters via Step-growth Polymerization
Poly(ethylene terephthalate) (PET) is an important commercial polyester and widely used as fibers, packagings, containers and engineering materials. It is believed that the incorporation of a low level of ionic groups into PETs dramatically improves the mechanical performance and compatibility with …
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Reactive processing methods for functionalisation of polymers and in-situ compatibilisation of poly(ethylene terephthalate)-based blends
… study was to functionalise various rubbers (i.e. ethylene propylene copolymer (EP), ethylene propylene diene terpolymer (EPDM), and natural rubber (NR)) using functional monomers, maleic anhydride (MA) and glycidyl methacrylate (GMA), via reactive processing routes. The functionalisation of the …
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Structure-Property Relationships of Alicyclic Polyesters
Polyesters are an important class of polymers in many applications ranging from common-use objects—such as packaging containers, clothing, and upholstery—to more advanced applications, such as lightweight strength materials in construction, electronics, and automotive parts. Poly(ethylene …
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