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 264 for “"polyester"”.
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Lightweight polyester composites
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1984.
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Synthesis and characterization of novel polyester/polysiloxane and polyester/arylphosphine oxide copolymers
… weight poly(dimethylsiloxane) / cycloaliphatic polyester segmented copolymers were prepared and characterized. Specifically, polyesters based on dimethyl 1,4-cyclohexane dicarboxylate and 1,4-butanediol were employed. The copolymers were synthesized via a melt process using a high trans content …
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Molecular necklaces: polyester rotaxanes
Polyrotaxanes consisting of 30-60 membered aliphatic crown ether macrocycles whose cavities are pierced by polysebacate chains were synthesized by several polymerization approaches including transesterification polymerization, the acid chloride method, and interfacial polymerization. The …
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Microbial degradation of polyester polyurethane
During the course of these studies, polyester polyurethane foam has been found to be readily degraded in soil and marine environments. The incorporation of the formulation biocide Vinyzene E.P. reduced the rate and extent of degradation in test material exposed to soil conditions, but was found to …
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A comparative study of athletic apparel made from cotton/flax, cotton/polyester, and polyester/flax blends
… most sports apparel is made from a blend of polyester or other synthetic fibers. Through examining the uniqueness of natural fibers, such as cotton and flax, the advantages and benefits of using a higher percentage of natural fibers when manufacturing comfortable and functional high …
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Sustainability within the polyester value chain
… is scope for improving the sustainability of the polyester industry; however trade-offs need to be carefully considered on a case by case basis.
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Spray deposition of cork reinforced polyester
… to current applications of glass reinforced polyester. The low initial investment and high flexibility of the spray lay-up process make it an attractive candidate to study. A spray lay-up apparatus was successfully constructed and employed in manufacturing parts from a hybrid material …
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Recyclage mécanique de composites polyester et fibres de verre comme charge de remplacement dans une matrice polyester vierge
… les propriétés mécaniques d’une matrice de polyester vierge contenant du recyclat à divers taux ainsi qu’à des temps de mélange différents ont été analysées. Il apparait que le contenu en fibres est plus élevé dans les classes granulométriques les plus fines que celles entre 106 et 600 µm. …
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Development of Anti-corrosive Polyester Powder Coatings
… purpose. In this study, UV-resistant polyester/TGIC powder coatings for outdoor application were developed instead of the widely used epoxy-based coatings. Three types of additives and functional filler, namely zinc phosphate with passivation effect, zinc powder with sacrificial anode …
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2 dimension woven kenaf reinforced unsaturated polyester composite
… using floor loom and infused with unsaturated polyester resin using vacuum infusion process. The mechanical properties of the composites were measured and showed that satin 8/3 has highest tensile strength of 39MPa and Plain has highest tensile modulus of 2.63GPa, with flexural strength and …
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Toughening polyester resin by elastomeric coating on filler
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Chemical Engineering, 1980.
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Topology and Telechelic Functionality Control in Polyester Design
… long-chain branched, and novel crosslinked polyesters for applications spanning from pressure sensitive adhesives to biomedical applications. Altering polymer topology and functionality using different synthetic strategies was enabled tailoring the thermomechanical, rheological, and adhesive …
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Bacterial interactions and enzyme kinetics in environmental polyester degradation
… the environmental biodegradation of copolyesters was explored to understand the biological processes that control the removal of these materials in natural systems. First, the role of microbial consortia over single organisms in the degradation of poly(butylene sebacate coterephthalate) …
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Modification of a microbial co-polyester by graft copolymerisation
… coupled with biodegradability. Microbial polyesters are biodegradable, but no commercial grade was available that met the required thermal criteria detailed below. Therefore it was decided to attempt to lower the thermal softening temperature by grafting chains of poly(methyl acrylate), …
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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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Design of Improved Polyester Dielectric Insulators for Electronic Packaging
… used to lower the dielectric constant of the copolyester thermoset to 2.5 $\rm (25\sp\circ C,$ 1 kHz) are described. Second, the nature of the increase in melting temperature of the liquid crystalline copolyesters upon annealing near their original melting temperature to improve the dimensional …
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Toughening of a polyester and epoxy molecular network system
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 1997.
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The quantitative application of mineral oil and its effect on the flammability of polyester and acetate/polyester FR fabrics used for women's nightgowns
Two brushed tricot fabrics, a 100% polyester and an 80% acetate/20% polyester FR, were used to pursue the following objectives: 1) to develop a procedure for uniformly applying a known amount of mineral oil to the fabric specimens; 2) to develop a procedure for handling and conditioning the …
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Development and evaluation of fire retardent unsaturated polyester clay nanocomposites.
… (fibrous) reinforcements within an unsaturated polyester matrix. A new fire retardant unsaturated polyester resin system capable of UL94 classification VO was developed. The novel approach used to achieve this innovative class of material did not include halogenated compounds, but instead …
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