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 20 of 20 for “"adipate"”.
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Ruminal Degradation of Polyhydroxyalkanoate and Poly(butylene succinate-co-adipate)
… (PHA) and poly(butylene succinate-co-adipate) (PBSA) biodegradable materials for feed storage products such as bale netting could reduce the incidences and effects of polyethylene-based plastic impaction in ruminants. The objectives of these studies were to evaluate the degradability …
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Biodegradable polymer/clay nanocomposites based on poly(butylene adipate-co-terephthalate) and Polylactide
<p>"In offering a scientifically succinct methodology which leads to property-enhanced biodegradable polymer products for broader application, as well as in promoting the use of bio-sourced renewable polymers such as Polylactide (PLA) in biodegradable polymers with desirable properties from …
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The use of enzymes in organic solvents in polytransesterification reactions
… using 1,4-butanediolibis(2,2,2- trichloroethyl) adipate and glutarate systems in diethyl ether, with and without molecular sieves. It was found that molecular sieves promoted the reaction by reducing hydrolysis of the ester end-groups, resulting in polymer molecular weights between 1.2 and 2.2 …
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The use of enzyme catalysts in organic media for the synthesis of biodegradable polyesters
… catalysed reaction of bis(2,2,2-trichlorethyl) adipate and glutarate with butane-1,4-diol in anhydrous ether with and without molecular sieve was investigated over a range of times from 8 to 240 hours. The 72 hour adipate reaction with molecular sieve gave the highest molecular weight polymer …
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Free-radical maleation of poly(butylene adipate-co-terephthalate) in supercritical carbon dioxide and its effect on the percolation and deformation mechanism of layered silicate nanocomposites
… of compostable polymers such as poly(butylene adipate-co-terephthalate) (PBAT) in single-use packaging applications can mitigate the water, solvents, and energy required for processing plastic waste. PBAT exhibits exceptional elongational properties, but its moderate water vapor permeability …
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Substrate specificity and functional characterization of sodium/dicarboxylate cotransporters
… inward currents in the presence of glutarate, adipate, and succinate, whereas oocytes expressing rbNaDC1 have currents only with succinate. To identify NaDC1 domains involved in different ability to transport glutarate and adipate, I constructed a series of mNaDC1-rbNaDC1 chimeras, and used …
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Growth behavior of fibroblasts influenced by small changes in polymer structure
… were poly (DTD) dodecandioate and poly (DTE) adipate taken from the two extreme positions of the combinatorial library developed by Prof.J.Kohn. Thermal analysis techniques were used to study the molecular structure of the material. Higher degradation rate, less water uptake in the aqueous …
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Polylactic Acid based Blends and Composites for Material Extrusion 3D Printing: Formulation, Characterization, and Processing
… was to develop polylactic acid/poly(butylene adipate-co-terephthalate) (PLA/PBAT) blends and their composites containing cellulose nanocrystals (CNCs), suitable for material extrusion 3D printing. In the first part, epoxidized canola oil (ECO), was utilized as a compatibilizer for PLA/PBAT …
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Applications of high resolution solid state carbon-13 NMR to the study of multicomponent polymer systems
… poly(ester)- urethane based on poly(1,4-butylene adipate) and 4,4¹ -diphenylmethane diisocyanate, (2) the compatibility at the molecular level of polymer blends containing poly{vinylidene fluoride) (PVF2), including solution and mechanical blends with poly{methyl methacrylate) {PMMA}, poly(vinyl …
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DRY POWDER INHALATION OF PNEUMOCOCCAL VACCINE USING POLYMERIC NANOPARTICLES AS CARRIERS
… via inhalation was developed. Poly(glycerol adipate-co-ω-pentadecalactone), PGA-co-PDL, NPs with either anionic or cationic surface charge of optimum size (~200-250 nm) to be effectively taken up by the lung dendritic cells (DCs) were successfully produced. The NPs were then surface adsorbed …
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PULMONARY DELIVERY OF RESVERATROL-LOADED NANOCOMPOSITE MICROPARTICLES TO TREAT LUNG CANCER
… Resveratrol was loaded into NPs of poly(glycerol adipate-co-ω-pentadecalactone) (PGA-co-PDL) with sizes ranging between 220-230 nm, which are ideal for uptake into cells. The 5%- and 10% resveratrol-loaded NPs (5% RNP and 10% RNP) had a high encapsulation efficiency of 39 ± 0.12 and 70 ± 0.89% and …
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Copolymerisation of polyesters using reactive extrusion
… Meanwhile, bioplastics such as polybutylene adipate-co-terephthalate (PBAT) offer sustainable alternatives but are constrained by their high costs and reliance on a specific degradation environment. This thesis explores a novel alternative recycling strategy, copolymerizing PET waste with …
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MicroRNA Nanocarriers for the Treatment of Chronic Obstructive Pulmonary Disease
… delivery. Anionic and cationic poly (glycerol adipate-co- ω-pentadecalactone), (PGA-co-PDL), NPs were produced using poly (vinyl alcohol) and dioleoyltrimethylammoniumpropane (DOTAP) respectively. The particle size of the anionic NPs was 266.10±20.80 nm and the incorporation of DOTAP resulted …
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Topology and Telechelic Functionality Control in Polyester Design
… succinate)s and poly(trimethylene adipate)s with neopentylglycol diacrylate. The oligomeric polyesters with telechelic hydroxyl functionality were synthesized from renewable monomers, adipic acid, succinic acid, and 1,3-propanediol using melt polycondensation. The molecular weights …
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PULMONARY DELIVERY OF PNEUMOCCOCAL VACCINE USING NANOCOMPOSITE MICROPARTICLE CARRIERS VIA DRY POWDER INHALATION
… of protein-loaded polyester poly (Glycerol Adipate-co-ω-Pentadecalactone), (PGA-co-PDL) NCMPs were optimised using Taguchi design and BSA as a model protein, by the double emulsion solvent evaporation method followed by spray drying. Particle size was mainly affected by the polymer mass and …
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Tailoring Siloxane Functionality for Lithography-based 3D Printing
… glycol) (PPG) and poly(tri(ethylene glycol) adipate) (PTEGA) for use in tissue scaffolding, footwear, and improved glove grip performance applications. The double endcapping of a PPG diamine with a diisocyanate and then hydroxyethyl acrylate provided a urethane/urea-containing, photocurable …
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Improving Impact Properties of Novatein through Polymer Blending and Reactive Extrusion
… polyethylene (PE), or biodegradable polybutylene adipate-co-terephthalate (PBAT) using twin-screw extrusion to allow for sufficient mixing and residence time for chemical interactions or reactions to form. Materials were characterized for mechanical (tensile and impact testing), thermal (dynamic …
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Exploitation of agricultural and forestry waste: from the recovery of bioactive compounds for nutraceutical applications to the production of innovative materials
… biodegradable polylactide (PLA)/poly (butylene adipate-co-terephthalate) (PBAT) polymeric blends. The resulting bio-film formulation showed improved performances in terms of UV-light resistance, antioxidant capacity, and mechanical properties. These results support the use of such PLA/PBAT-OWS …
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Application-oriented development of thermoplastic polyurethanes with shape memory properties
… in soft robotics, for instance. A polydecylene adipate-based TPU exhibiting a SS molecular weight of 3300 g × mol−1 and a HS content of 15 wt.% was developed and processed into actuators. Incorporating these into a gripper system enabled lifting and lowering a hen’s egg when the temperature was …
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Fused filament fabrication to manufacture three- and four-dimensional objects made of shape memory polymers
… materials. After developing a poly(1,10-decylene adipate) (PDA) based polyester urethane, processing it via FFF and thermomechanical treatment, a novel approach was developed to identify the ideal actuating temperature conditions using dynamic mechanical analysis. Once characterized, the polymer …