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.
Results
Showing 1 to 20 of 81 for “"Glass transition temperature (Tg)"”.
-
Polyamide-imide and Montmorillonite Nanocomposites
… (DSC) and Thermogravimetric analysis (TGA) was used to study impact of MMT on glass transition temperature (Tg) and degradation properties of PAI respectively. Micro-hardness testing of PAI nanocomposites was also performed. A concentration dependent state of dispersion was obtained. …
-
Crosslinked conventional size and nanoparticle size acrylic latexes and their blends: Investigation of the effects of crosslinking, particle size and distribution, glass transition temperature and blending on film formation, properties and morphology
… particle size ~ 120-130 nm) and distribution, glass transition temperature (Tg), and blending on latex film formation process, properties and latex morphology. Films cast from these latexes were characterized using specific end use tests and fundamental properties using advanced instruments …
-
Zero field NMR study on a spin glass: Iron-doped 2H-niobium diselenide
… NQR in 2H-NbSe2Fex. We measured (intensity)x(temperature), and T1P (spin-lattice relaxation parameter) and T2 (spin-spin relaxation time) as a function of temperature. Our data reveal dramatic difference between non-spin glass samples (x=O, 0.25%, 1% and 5%) and spin glass samples (x=8%, 10% …
-
Effect of manufacturing process conditions on the durability of pultruded vinyl ester/glass composites
… DMTA analysis showed that an increase in glass transition temperature, Tg, occurred with increased aging temperature, indicating additional cross-linking had occurred. However, results showed that line speed in the range examined did not affect mechanical properties or the degradation of …
-
Physics-informed data-driven frameworks for materials discovery
… for the classification of printability and glass transition temperature (Tg) in additive manufacturing processes. By integrating fundamental principles of physics into the machine learning models, this chapter demonstrates improved accuracy and reliability in predicting printability and Tg. …
-
Ion transport and structure of layer-by-layer assemblies
… peel-away technique. Results indicated that the glass transition temperature (Tg) of PEO/PAA films decreases with increasing assembly pH, but when assembled in the presence of salt, the Tg, remains constant. Results indicate that the degree of inter- and intramolecular PAA hydrogen bonding, …
-
The Influence of PVAP on the Stability of Amorphous Solid Dispersions of Itraconazole Produced using Hot Melt Extrusion Technology
… plasticity of PVAP while maintaining its high glass transition temperature (Tg). Amorphous solid dispersions of ITZ (40% w/w) in a 30:70% w/w PVAP:PVPVA mixture were produced by melt extrusion. Solid-state analyses of the composition were performed using differential scanning calorimetry and …
-
The glass transition and reaction kinetics under nanoconfinement
The glass transition temperature (Tg) of the bulk state has been extensively studied, however there is no adequate theory of the glass transition. Furthermore, under nanoconfinement, Tg decreases, increases, or remains the same compared with that of the bulk, with results depending on starting …
-
Synthesis and characterization of vanillyl alcohol based thermosetting epoxy resins
… that the presence of the methoxy lowers the glass transition temperature (Tg), yet increases the storage modulus (E') at 25 deg. C in cured epoxy-amine systems.
-
The effect of nanoclays on the properties of aspirin modified enteric polymer prepared by hot-melt mixing
… 100 C which is above the plasticized polymer's glass transition temperature (Tg) and below the ASP's melting point. Processing ASP with Eudragit L100-55 under these conditions does not promote hydrolysis of ASP. X-ray diffraction spectra obtained at room temperature reveal that the aspirin is …
-
Polymeric and Polymer/Inorganic Composite Membranes for Proton Exchange Membrane Fuel Cells
… These membranes also show advantages for high temperature applications because of the reinforcing effect of the filler, which helps to maintain the modulus of the membrane, allowing the membrane to maintain proton conductivity even above the hydrated glass transition temperature (Tg) of the …
-
THE EFFECT OF WATER ON THE PHYSICAL PROPERTIES OF EPOXIDES
… in epoxides was found to seriously depress the glass transition temperature (Tg), which explains the reason for the deterioration in the mechanical properties. A manual torsional pendulum was used to measure the Tg values. In a later stage, an automatic torsional pendulum was constructed to …
-
Morphology and self-assembly behavior of side chain liquid crystalline block copolymers
… copolymers (SCLCBCPs) that are based on a low glass transition temperature (Tg) siloxane backbone. Moieties that self-assemble into smectic liquid crystalline (LC) phases are covalently attached to the polystyrene-polyvinylmethylsiloxane (PS-PVMS) block copolymer backbone. Precise control over …
-
Creation of Ovalbumin Based Scaffolds for Bone Tissue Regeneration
… include an excess of GA was used. Using DSC, a glass transition temperature (Tg) was found for control indicating the scaffolds are amorphous. Average dry and wet compressive strengths were also found. As expected, differing GA concentrations had no significant effect on Tg and average …
-
POLY(ETHYLENIMINE)-BASED ELECTROLYTES FOR BATTERIES AND FUEL CELLS: SYNTHESIS, MODIFICATION AND CHARACTERIZATION
… scanning calorimetry was used to determine the glass transition temperature, Tg, of neat BPMEI (Tg = – 91°C), LPEEI (Tg = – 80°C) and LPBEI (Tg = – 50°C). Tgs of various N—alkylated PEI—lithium triflate complexes with different salt concentrations were …
-
Sub-Tg̳, solid-state, plasticity-induced bonding of polymeric films and continuous forming
If two pieces of a glassy polymer are brought into intimate contact (within molecular proximity) at temperatures well below their glass transition temperature (Tg) negligible adhesion, due to lack of inter-diffusion of macromolecules, will be noted. Because polymer chains are kinetically trapped …
-
The Effects of Molecular Structure and Design on the Plasticizer Performance Through Coarse-Grained Molecular Simulation
… to make the plastic more pliable by reducing the glass transition temperature, Tg and Young's modulus, Y. As the plasticizer aids in polymer process-ability and making it suitable for applications from industrial cables to sensitive medical equipment, the mechanism of plasticization is not fully …
-
Amorphe bioabbaubare Poly(esterurethan)netzwerksysteme mit Formgedächtniseigenschaften
… and a diisocyanate acting as coupling agent. The glass transition temperature Tg of the networks corresponds to the transition temperature Ttrans of the shape-memory effect. The thermal properties are mainly determined by the chemical structure and the content of the comonomers. Mechanical …
-
Survival of encapsulated probiotic bacteria during storage at low water activity at ambient temperature
… for 10 weeks of storage at 25oC (ambient temperature) at low water activities (aw). Three probiotic bacteria (Bifidobacterium animalis ssp. lactis Bb12, Bifidobacterium longum and Lactobacillus acidophilus) and one strain of most sensitive lactic acid bacteria (L. lactis ssp. cremoris) to …
-
Stabilisation of dehydrated nanoemulsions using sugar - protein matrices
… phase by maximising and minimising viscosity and glass transition temperature (Tg’) using mixture design software. Increasing levels of β-casein from caused a significant increase in viscosity, particle size, and nanoemulsion stability, while resulting in a decrease in Tg’. Powders were made from …
Page 1 of 5