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Showing 1 to 20 of 20 for “"copolyester"”.
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The biocompatibility and characterization of aromatic thermosetting copolyester
… synthetic polymers called aromatic thermosetting copolyesters (ATSP) as potential biomaterials for bone replacements (implants). These materials are easy to manufacture and have good mechanical properties such as high tensile strength, and high wear resistance. They can be made into bulk, film, …
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Definierte Synthese hyperverzweigter Copolyester und Copolyether mit kontrolliertem Verzweigungsgrad
Das Ziel der vorliegenden Arbeit war die experimentelle Bestätigung theoretischer Vorhersagen über die Kontrolle des Verzweigungsgrads hyperverzweigter Polymere durch Copolymerisation von AB2- mit AB-Monomeren. Hier-zu wurden Polykondensationsreaktionen und selbstkondensierende …
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Design of Aromatic Thermosetting Copolyester Compositions and Blends for Thin Film Applications
… and applications of aromatic thermosetting copolyester (ATSP) and multicomponent systems of ATSP and polyimide thin films. Originally, ATSP was developed as a high performance structural polymer. One drawback to this system is the inability to prepare uniform thin films from NMP solutions of …
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Design and characterization of aromatic thermosetting copolyester resin for polymer matrix nanocomposites
… systems utilizing aromatic thermosetting copolyester resin enriched with various forms of nanofiller particles. The molecular weight and crosslinking functionality of precursor oligomers during condensation polymerization reaction regulate thermal-mechanical properties of self-generated …
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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 …
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Synthesis and Characterization of Amorphous Cycloaliphatic Copolyesters with Novel Structures and Architectures
A series of random and amorphous copolyesters containing different cycloaliphatic rings within the polymer chains were prepared by melt polycondensaton of difunctional monomers (diesters and diols) in the presence of a catalyst. These polyesters were characterized by nuclear magnetic resonance …
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Rheological characterizaton, and the development of molecular orientation and texture during flow for a liquid crystalline copolymer of para- hydroxybenzoic acid and polyethylene terephthalate
… liquid crystalline polymers. These include a copolyester of para-hydroxybenzoic acid and polyethylene terephthalate, and an anisotropic solution of 12 weight% Kevlar in 100% sulfuric acid. It was found that in the case of the copolyester system, the steady shear and dynamic viscosities were …
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Mechanical Properties of Candidate Materials for Morphing Wings
… were a type of thermoplastic polyurethanes, copolyester elastomer, shape memory polymer, or woven materials that are made out of elastane yarns. The first study determined the required forces to strain the material in a uniaxial direction. A test stand was designed with a gripping device to …
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Thermal and Morphological Study of Segmented Multiblock Copolyesters Containing 2,2,4,4-Tetramethyl-1,3-cyclobutanediol
… studies of the segmented multiblock copolyesters containing 2,2,4,4-tetramethyl-1,3-cyclobutanediol and dimethyl-1,4-cyclohexane dicarboxylate were carried out using differential scanning calorimetry, small angle X-ray scattering, wide angle X-ray diffraction and dynamic mechanical …
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Synthesis and Thermal Characterization of a Series of Copolyesters Synthesized from Terephthaloyl Chloride, 2,2,4,4-tetramethyl-1,3-cyclobutanediol, and Bisphenol A, AF, F, and HPF
The synthesis of copolyesters which contain both aromatic as well as aliphatic dial monomer units has been conducted The rigidity of 2,2,4,4-tetramethyl-1,3- cyclobutanediol (CBDO) makes it a viable candidate to replace or use along with rigid aromatic dials. Bisphenols A, AF, F, and HPF have also …
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Design of unique composites based on aromatic thermosetting copolyesters
Aromatic thermosetting copolyester (ATSP) has promise in high-temperature applications. It can be employed as a bulk polymer, as a coating and as a matrix for carbon fiber composites (ATSP/C composites). This work focuses on the applications of high performance ATSP/C composites. The morphology of …
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Polymer structure and property studies in elongational rheology, spherulite deformation, and biaxial strain induced crystallization
… of polymeric semicrystalline morphologies in a copolyester by scanning electron microscopy were made possible by the development of a novel chemical etch. Spherulitic textures were consistent with classic spherulite growth mechanisms and structure theories. Uniaxial deformation of a single …
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Design of aromatic thermosetting polyester composites for thermally stable devices
Aromatic thermosetting copolyester (ATSP) has been under development since 1995 in Professor James Economy’s research group at the University of Illinois, Urbana-Champaign. It can be seen as a major development in high performance polymers as it affords a highly processable series of routes towards …
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Advancing Step-Growth Polymers: Novel Macromolecular Design and Electrostatic Interactions in Polyesters and Polyurethanes
… synthesized high molecular weight segmented copolyesters. The cycloaliphatic monomers 2,2,4,4-tetramethyl-1,3-cyclobutanediol (CBDO) and dimethyl-1,4-cyclohexane dicarboxylate (DMCD) afforded sterically hindered, ester carbonyls in high-Tg polyester precursors. Reaction between the polyester …
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In situ composites of compatibilized polypropylene/liquid crystalline polymer blends
… polymers (LCPs), two liquid crystalline (LC) copolyesters and one LC poly(ester-amide), were used. The PP/LCP blends were compatibilized with a maleic anhydride grafted polypropylene (MAP) to enhance the mechanical properties. The effect of increasing MAP content on the mechanical properties, …
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Development of aromatic polyesters for high performance applications and use of interchain transesterification reactions as a solid-state fabrication tool
Deposition and cure of aromatic thermosetting copolyester (ATSP) oligomers is explored across several potential schemes: plasma spray, solvent-borne, and as an electrostatic powder coating. It is generally found that all methods are potentially viable as low friction, low wear coatings but that …
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Linking the Rheological Behavior to the Processing of Thermotropic Liquid Crystalline Polymers in the Super-cooled State
… melting point. One TLCP (Tm~350 oC) used is a copolyester of HBA/TA/HQ/HQ-derivatives with high HBA content. The other TLCP (Tm~280 oC) is a copolyesteramide of 60 mol% hydroxynaphthoic acid, 20 mol% terephthalic acid and 20 mol% 4-aminophenol. The TLCP/TLCP blends and neat TLCPs were first …
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Bond exchange reactions in high temperature thermoset polymers
… the exchangeable bonds. Aromatic thermosetting copolyesters (ATSP) are a family of all-aromatic thermosets synthesized through crosslinkable aromatic copolyester oligomers and they possess a high density of ester bonds while also having extremely high thermal stability, thermomechanical …
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Experimental and numerical investigation of ballistic impacts: an introduction to novel polymer foam core sandwich structures and adaptive SPH formulation
Embargo set by: Colleen Fallaw for item 102576 Lift date: 2019-08-10T21:25:30Z Reason: Author requested closed access (OA after 2yrs) in Vireo ETD system