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Showing 1 to 18 of 18 for “"structure-property behavior"”.
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Structure-property behavior of sol-gel derived hybrid materials
Structure-property studies were carried out on a number of different hybrid sol·gel materials. Multifunctional silicon ethoxides were prepared and studied by solid state ²⁹Si NMR and Raman spectroscopy to determine the type of silicate structures formed and the degree of conversion attained by the …
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Structure-property behavior of polyimide homopolymers, copolymers, and blends
Fully imidized, high molecular weight polyimide homopolymers and random segmented poly(siloxane imide) and poly(aryl ether imide) copolymers were prepared for use as environmentally stable, tough structural matrix resins, structural adhesives, and dielectric materials. Although polyimides are well …
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Crystallization behavior and structure property behavior of selected thermoplastic polymers
The crystallization behavior of poly(p-phenylene sulfide) PPS has been studied. Two PPS samples with < M<sub>w</sub> > = 43K and < M<sub>w</sub> > = 83K were fractionated to remove low molecular weight oligomers yielding fractionated PPS samples with < M<sub>w</sub> > = 57K and < Mw > = 113K. The …
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Structure-property behavior of elastomeric telechelic ionomers in bulk and solution
The structure-property behavior of two types of elastomeric telechelic ionomers has been investigated. Sulfonated polyisobutylene telechelic ionomers were studied in both bulk and solution. The bulk mechanical properties of carboxylated polyisoprene telechelic ionomers were also investigated. The …
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Structure/property behavior of inorganic/organic sol-gel derived hybrid materials
… of poly( tetramethylene oxide) (PTMO). The structure-property relationships were determined for these hybrid networks from their dynamic mechanical behavior, mechanical properties, and SAXS behavior. Thermal gravimetric data coupled with FfIR analysis were used to obtain a qualitative …
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Structure property behavior of an ethylene-propylene-diene ionic terpolymer containing zinc stearate
The structure property behavior of an ethylene-propylenediene ionic terpolymer containing varying amounts of ZnSt was investigated. Studies show that ZnSt acts as a reinforcing filler under ambient conditions. Stress-strain behavior, percent relaxation, hysteresis and permanent set were all found …
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Processing and structure-property behavior of microporous polyethylene: from resin to final film
… and the line speed. The melt relaxation time behavior of the HDPE resins was studied by a Carreau-Yasuda analysis. The orientation morphological features of the extruded films were examined by TEM, HSEM, birefringence, WAXS, SAXS, and linear IR dichroism. The molecular weight distribution of …
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Structure-property behavior of novel high performance thermoplastic and thermoset structural adhesives and composite matrix resins
… for controlled processability. Rheological behavior was investigated with a parallel plate type viscometer and the results confirmed the thermoplastic nature of these systems. Phenyl ethynyl endcapped polyimides were synthesized for a broad based investigation of their processibility and …
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Structure-property behavior of free radical synthesized polydimethylsiloxane-polystyrene block polymers and polytetramethyleneoxide based ionene elastomers
Structure-property behavior of free radical synthesized polydimethylsiloxane (PDMS) - polystyrene and PDMS-styrene derivative block polymers have been studied. The block polymers were provided by Dr. J. V. Crivello from GE. Two different types of segmented polytetramethyleneoxide (PTMO) based …
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Investigation of the Influence of Selected Variables on the Solid State Structure-Property Behavior of Segmented Copolymers
… of selected variables on the solid state structure-property behavior of segmented poly(ether-block-amide), polyurethane, polyurethaneurea, and polyurea copolymers is explored. The specific variables which have been utilized singly or in conjunction with others are hard segment …
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Structure-property behavior of hybrid materials incorporating oligomeric species with inorganic silicates by a sol-gel process
… new bridging route and, if successful, study the structure-property relationships of these new materials. In this thesis, tetraorthosilicate was used to combine with one of three types of oligomers, which included silanol terminated polydimethylsiloxane (PDMS), triethoxysilane endcapped …
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Structure-property relationships of electron beam irradiated monomeric and polymeric systems
Structure-property relationships were investigated for electron beam(EB) irradiated monomeric and polymeric systems. The objectives were to study the feasibility of preparing systems of potential application, and to characterize these systems in terms of structure-property behavior. In this thesis, …
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Structural and morphological characterization of model elastomeric ion containing polymers
… years, there has been widespread interest in the structure property behavior of ion containing polymers. Of particular interest are those materials termed ionomers which contain ionic groups that are typically less than 15 mole percent. These ionic interactions provides an additional means of …
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Studies of blends containing liquid crystalline polymers with PET and related investigations of hydroquinone/biphenol polysulfone systems
The investigation of structure-property behavior of extruded cast films prepared from blends of thermotropic liquid crystalline copolyesters with polyethylene terephthalate (PET). Data were obtained which showed not only the temperature dependence of the moduli and stress-strain behavior but also …
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The modification of polymeric materials with plasticizers or elastomers
… modifiers was valuable with regard to both property and morphological effects. The second research project considers the structure-property behavior of polyvinyl chloride (PVC) plasticized with low molecular weight diesters with emphasis on the contrasting effects of different plasticizers …
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Moisture-Cure Polyurethane Wood Adhesives: Wood/Adhesive Interactions and Weather Durability
… (PUR) wood adhesives: wood/PUR interactions and structure-property behavior emphasizing on weather durability. For these purposes, one simplified model PUR (MPUR) and three more commercially significant PURs (CPURs) with different hard segment contents were prepared. Separately, an early side …
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Structure–Property Relationships Of: 1) Novel Polyurethane and Polyurea Segmented Copolymers and 2) The Influence of Selected Solution Casting Variables on the Solid State Structure of Synthetic Polypeptide Films Based on Glutamate Chemistry
… confirm the presence of the microphase separated structure. The investigation into the effects of diisocyanate chemistry and its symmetry was broadened to incorporate non-chain extended polyurethane materials with different soft segment molecular weights, as well as polyurethanes that did contain …
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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 …