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 34 for “"Solvent Resistance"”.
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LEVERAGING CONFINEMENT AND SURFACE EFFECTS TO CONTROL POLYMER PHASE BEHAVIOR AND TRANSPORT PHENOMENA IN POLYMER-INFILTRATED NANOPARTICLE FILMS
… interaction asymmetry impact phase behavior, solvent resistance, and transport phenomena in blend-PINFs. Using a combination of optical microscopy, spectroscopic ellipsometry, scanning electron microscopy, small-angle neutron scattering (SANS), and resonant soft X-ray scattering (RSoXS), we …
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Synthesis and characteristics of polyarylene ether sulfones
… dimethylsulfoxide (DMSO) as a dipolar aprotic solvent and aqueous sodium hydroxide as a base. High molecular weight homopolymers can be synthesized in a short time (1 hour). However, hydrolytic side reactions can limit its scope for the synthesis of block copolymers. An alternate route using …
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Synthesis and Characterization of Phenylethynyl Terminated Poly(arylene ether sulfone)s as Thermosetting Structural Adhesives and Composite Matrices
High temperature, solvent resistant materials which also display good mechanical properties are desired for use as aerospace structural adhesives and polymer matrix/carbon fiber composites. High molecular weight amorphous poly(arylene ether sulfone) thermoplastic materials display many of these …
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Quartz Crystal Microbalance with Dissipation Monitoring Applications in Polymer Thin Films Analysis
… cell walls, crosslinked thermoplastic films with solvent molecules, as well as commodity thermoplastic films with air and moisture during aging by a powerful surface analysis instrument, a quartz crystal microbalance with dissipation monitoring (QCM-D). The assembly and interactions of glucan and …
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Development of polyimide/metal gradient microcomposite films
… such as high thermal stability and good solvent resistance. At the same time, much effort is put into modifying polyimides to introduce different properties. This thesis describes a study where polyimides were modified with soluble metal compounds in an effort to create microcomposite …
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Siloxane modified engineering thermoplastics
… microstructure of the polyester segment. Solvent resistance was shown to improve as the level of crystallinity was increased. Segmented block copolymers of an amorphous polyarylester and polydimethylsiloxane were also investigated. Both the random-block and perfectly alternating synthetic …
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Synthesis and Characterization of Thermosetting Polyimide Oligomers for Microelectronics Packaging
… The crosslinked films also had exceptional solvent resistance as evidenced by a high gel fraction (greater than or equal to 95%) following extraction in common solvents for several days. This was in contrast to the amorphous thermoplastic controls, which quickly dissolved upon immersion in …
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High performance thermoplastic matrix composite processing: dry powder prepregging, plasma treatment, consolidation/crystallization analysis
… of improved mechanical performance, greater solvent resistance, better impact tolerance, as well as cost saving processing attributes such as infinite shelf life, the ability to be recycled, short processing time and repairability. Unfortunately, these advantages come at the expense of a very …
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High temperature nanofoams based on ordered polyamide matrices
… matrices with improved mechanical properties and solvent resistance. The labile component was degraded with thermal treatment in air, leaving behind pores where the size and shape were largely determined by the original multiphase copolymer morphology.
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Physical Aging and Characterization of Engineering Thermoplastics and Thermoplastic Modified Epoxies
… temperatures for the difunctional epoxy. The solvent resistance of the reactive thermoplastic toughened tetrafunctional epoxy was higher than the non-reactive thermoplastic toughened system. The tetrafunctional epoxies with the reactive toughener also had higher toughener glass transition …
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Interfacially polymerized thin film composite membranes on microporous polypropylene supports for reverse osmosis desalination
… the IP technique. Substantial chemical, pH, and solvent resistance is provided by porous polypropylene membranes. Therefore, it is reasonable to choose porous polypropylene membranes as supports to fabricate TFC membranes for reverse osmosis. The external and the pore surfaces of polypropylene …
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Synthesis and basic characteristics of segmented poly(arylene ether sulfone)-poly(arylate) copolymers
… carbonate and anhydrous aprotic dipolar solvents. Poly(biphenol terephthalate) and poly(oxybenzoate) were synthesized in situ as the second, potentially anisotropic, sem;crystalline segment. These segmented copolymers were synthesized either by solution t interfacial, or melt acidolysis …
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Correlation of Polymer Performance and Hansen Solubility Parameters
… such as hydrophobicity, stain repellency or solvent resistance. It was further discovered that HSP may be useful with predicting relative performance of wet state properties such as wet tensile strength and elongation.</p>
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3D Printing of Specialty Devices for Geochemical Investigations: Real-Time Studies of Goethite and Schwertmannite Formation
… presents findings for enhancing mechanical and solvent resistance properties of a commercial 3D printing material (Formlabs Clear) by UV post-curing procedures and also provide data showing its stability in aqueous solutions at pH 0, 5.7, and 12 for periods of up to 18 days. Thermal degradation …
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Synthesis and characterization of new polycarbonate material systems
… network materials were found to have superior solvent resistance as compared to the linear material while retaining much of the useful mechanical properties (high fracture toughness, etc.) of bisphenol A polycarbonate. Furthermore, the glass transition temperatures of the networks were found to …
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Synthesis and characterization of novel macromolecules/networks via side chain modifications of amorphous poly(arylene ethers)
… aromatic substitution with a dipolar aprotic solvent, toluene as the azeotroping agent, and a slight excess of potassium carbonate as the weak base was the preferred methodology. The concentration of amines along the polymer backbone was successfully controlled by varying the ratio of …
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Novel high performance thermosetting polyimides
… A "one pot" procedure utilizing NMP as the solvent and o-dichlorobenzene as the azeotroping agent reproducibly exhibit fully imidized soluble polyimides with <Mw>/<Mn> values of ~2.0 determined by gel permeation chromatography (Universal Calibration). Successful molecular weight control was …
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High performance polymeric networks and thermoplastic blends: microwave versus thermal processing
… may also be transformed into tough, solvent resistant networks. In the current investigation amine-, maleimide- and nadimide-terminated PEK's of controlled molecular weights were synthesized and crosslinked by both electromagnetic radiation (EMR) processing and classical thermal …
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Synthesis and characterization of soluble, melt-processible aromatic poly(amide-imides)
… to develop crystallinity that would enhance solvent resistance and thermooxidative stability. Some novel poly(amide-imides) were also synthesized that showed improvements in existing properties such as increased flame-retardancy and elevated glass transition temperatures.
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The synthesis, stabilization and sintering of high performance semicrystalline polymeric powders
… has excellent mechanical properties as well as solvent resistance. However, it has been reported that under the recommended high temperature melt processing conditions the material may degrade via branching and crosslinking. An alternative to melt processing PEEK is to apply the powder …
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