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 286 for “"structure-property relationships"”.
-
Structure-property relationships in novel ionomers
It is observed for the first time that telechelic ionomers based on sulfonated polyisobutylene exhibit primary and secondary SAXS peaks when the molecular weight distribution is narrow (Mw/Mn ca. 1.15). These SAXS peaks are interpreted as due to non-global lamellar or cylindrical ionic domain …
-
Structure-property relationships in segmented copolymers
The structure-property relationships for various segmented copolymers were investigated. A number of mechanical and thermal characteristics were determined. The morphology was characterized by SAXS with respect to size and dispersion of domains; degree of phase separation and the domain interfacial …
-
Structure-property relationships of multiphase copolymers
… the polyimide and processing conditions on the structure-property relationships in a series of polyimide-PDMS containing approximately 15Wt.% PDMS was studied. It was determined that as the polarity of the polyimide segment increased the morphology shifted to texture with lower surface/volume …
-
Structure-Property Relationships of Alicyclic Polyesters
Polyesters are an important class of polymers in many applications ranging from common-use objects—such as packaging containers, clothing, and upholstery—to more advanced applications, such as lightweight strength materials in construction, electronics, and automotive parts. Poly(ethylene …
-
Understanding Structure-Property Relationships for Impact Polystyrene
The understanding of impact polystyrene structure-property relations was previously limited to ex situ analysis. Developing in situ analysis methods for morphology development and interfacial tension characterization would enhance fundamental understanding of the multi-component, multi-phase impact …
-
Structure-property relationships in extruded plastics foams
… of 500 pm from the surface, the crystal structure of this polymer is only consist of B-spherulites. On the other hand, the chemical blowing agent (Hydrocerol CF-20), was found to have nucleating affect on microstructure of polypropylene, where, it has resulted in reduction of size of …
-
Modelling of Structure-Property Relationships in Perovskites
… cell materials facilitates strong precision of structure, and determination of electronic properties. Within this thesis, the electronic properties of cubic metal-halide ABX3 perovskites (A=Cs,MA B=Pb,Sn X=Cl,Br,I) are modelled in order to elucidate phase-dependent electronic properties and …
-
Structure-Property Relationships in Nitride Electronic Devices
… To reach the full potential of GaN-based HEMT structures, which often have numerous material defects, nanoscale electrical characterisation techniques are needed to provide insights into their structure-property relationships. Scanning capacitance microscopy (SCM) is an AFM-based technique that …
-
Structure-property relationships in physical polymer gels
… in the network, it is possible to see relationships between the rate at which chains associate and dissociate and the presence of non-monotonic flow behaviors. Dangling chain tumbling due to the internal flux of the system under shear resulted in decreased stress through the ability to …
-
Structure-Property Relationships of Flexible Polyurethane Foams
… features of flexible polyurethane foams from a structure-property perspective. A major part of this dissertation addresses the issue of connectivity of the urea phase and its influence on mechanical and viscoelastic properties of flexible polyurethane foams and their plaque counterparts. Lithium …
-
Structure Property Relationships of Proton Exchange Membranes
… and develop concepts for establishing structure/property relationships between the functionality of the polymer backbone, the states of water and the membrane transport properties. Most of the hydrocarbon based random copolymers reported in the literature show reduced proton …
-
Structure-Property Relationships of Flexible Polyurethane Foams
This study examined several structure-property features of flexible polyurethane foams that are important aspects of foam production. AFM and WAXS were used to demonstrate the existence, for the first time in typical polyurethane foam systems, of lamellae-like polyurea structures ca. 0.2 mm long …
-
Structure-property relationships in polyurethanes from lignin
Lignin based polyurethane films were synthesized by solution casting from hydroxypropyl lignins and diisocyanates. Kraft and steam explosion lignin, hexamethylene diisocyanate (HDI) and tolylene diisocyanate (TDI), were used for the study. It was found necessary to use stoichiometric excess amounts …
-
Structure-property relationships of novel cellulose esters
Cellulose “waxy” (long-chain aliphatic) tri-esters of lauric (C₁₂), myristic (C₁₄), stearic (C₁₈), and eicosanoic (C₂₀) acids; mixed esters of lauric and acetic acids; and fluorinated mixed esters of 2,2,2-trifluoroethoxyacetic (TFEA) and acetic acids were synthesized in homogeneous DMAc/LiCl …
-
Structure-property relationships in poly-(propylene-ethylene) copolymers
… the interrelationship between the morphological structure and their physical, mechanical, thermal and thermo-mechanical properties. The toughness of the copolymers can be enhanced at low temperatures by increasing the ethylene content, at the expense of a loss in stiffness. A study of the …
-
Structure-property relationships of earth and engineered materials
Structure-property relationships, which describe the connection between an atomic-scale structure and arising functional properties, inform our understanding of the physical world, from unraveling deep-earth dynamics to developing and tuning profitable materials. A comprehensive characterization of …
-
Structure-Property Relationships of Polyisobutylene-Block-Polyamide Thermoplastic Elastomers
<p>Thermoplastic elastomers (TPEs) are a class of polymer fit for a wide variety of applications due to their customizability. In the synthesis of these types of materials, an elastically-performing polymer, deemed the “soft block,” is combined with a stiffer “hard block” polymer, each of which can …
-
Structure-property relationships in strontium barium niobate relaxor ferroelectrics
Studies of the structure-property relationships in strontium barium niobate Sr$\sb{\rm x}\rm Ba\sb{1-x}Nb\sb2O\sb6$ (SBN x/1 $-$ x) have been performed using a combination of dielectric spectroscopy, Sawyer-Tower polarization techniques, and transmission electron microscopy (TEM). The dielectric …
-
Structure activity and structure property relationships of antimalarial imidazopyridazines
… of analogues was designed and synthesised. Structure-Activity Relationship (SAR) and Structure-Property Relationship (SPR) studies aimed at retaining the good antiplasmodium activity while improving solubility and reducing hERG channel inhibition, were conducted. Previous studies conducted …
Page 1 of 15