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(1 - 13 of 13)
- Title
- A model for antiplasticization in polystyrene
- Creator
- Hlatshwayo, Sandie Anderson
- Date
- 1993
- Collection
- Electronic Theses & Dissertations
- Title
- Application of high-impact polystyrene (HIPS) as a graphene nanoparticle reinforced composite thermoplastic adhesive
- Creator
- Stitt, Erik
- Date
- 2017
- Collection
- Electronic Theses & Dissertations
- Description
-
"Adhesive bonding is a more efficient joining method for composites than traditional mechanical fasteners and provides advantages in weight reduction, simplicity, and cost. In addition, the utilization of mechanical fasteners introduces stress concentrations and damage to the fiber-matrix interface. Adhesive bonding with thermoset polymers distributes mechanical loads but also makes disassembly for repair and recycling difficult. The ability to utilize thermoplastic polymers as adhesives...
Show more"Adhesive bonding is a more efficient joining method for composites than traditional mechanical fasteners and provides advantages in weight reduction, simplicity, and cost. In addition, the utilization of mechanical fasteners introduces stress concentrations and damage to the fiber-matrix interface. Adhesive bonding with thermoset polymers distributes mechanical loads but also makes disassembly for repair and recycling difficult. The ability to utilize thermoplastic polymers as adhesives offers an approach to address these limitations and can even produce a reversible adhesive joining technology through combining conductive nanoparticles with a thermoplastic polymer. The incorporation of the conductive nanoparticles allows for selective heating of the adhesive via exposure to electromagnetic (EM) radiation and simultaneously can augment the mechanical properties of the adhesive and the adhesive joint. This approach provides a versatile mechanism for efficiently creating and reversing structural adhesive joints across a wide range of materials. In this work, a high-impact polystyrene (HIPS) co-polymer containing butadiene as a toughness modifier is compounded with graphene nano-platelets (GnP) for investigation as a thermoplastic adhesive. The properties of the bulk composite adhesive are tailored by altering the morphology, dispersion, and concentration of GnP. The thermal response of the material to EM radiation in the microwave frequency spectrum was investigated and optimized. Surface treatments of the adhesive films were explored to enhance the viability of this nanoparticle thermoplastic polymer to function as a reversible adhesive. As a result, it has been shown that lap-shear strengths of multi-material joints produced from aforementioned thermoplastic adhesives were comparable to similar thermoset bonded joints."--Page ii.
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- Title
- Chemical modification of polymer surfaces using sulfonation to improve adhesion properties
- Creator
- Asthana, Himanshu
- Date
- 1993
- Collection
- Electronic Theses & Dissertations
- Title
- Diffusion coefficients of polystyrene and acrylonitrile copolymers in dilute solutions by lightbeating spectroscopy
- Creator
- Gyeszly, Steven William, 1943-
- Date
- 1974
- Collection
- Electronic Theses & Dissertations
- Title
- Effect of heat treatment and surface charge heterogeneities on the initial rate of flocculation of polystyrene particles
- Creator
- Leuderalbert, Connie Jo
- Date
- 1997
- Collection
- Electronic Theses & Dissertations
- Title
- Electrostatic attraction of microorganisms to polystyrene
- Creator
- Lyman, Steven B.
- Date
- 1984
- Collection
- Electronic Theses & Dissertations
- Title
- Equilibrium and non-equilibrium conformation and mechanical properties of nanoparticle/linear polymer blends
- Creator
- Bohnsack, David Andrew
- Date
- 2007
- Collection
- Electronic Theses & Dissertations
- Title
- New methods in optical fiber preparation for scintillating tile calorimetry
- Creator
- Tannenbaum, Benn Harold
- Date
- 1993
- Collection
- Electronic Theses & Dissertations
- Title
- Optimization of polystyrene foam core sandwich panels for self-supported roof applications
- Creator
- Maurer, Myron John
- Date
- 2010
- Collection
- Electronic Theses & Dissertations
- Title
- Structure-property correlations of polyhedral oligomeric silsesquioxane in model polystyrene
- Creator
- Namani, Madhu
- Date
- 2014
- Collection
- Electronic Theses & Dissertations
- Description
-
In recent years the blending of 0-, 1-, and 2- dimensional inorganic fillers such as POSS, carbon nanotubes, and nano-clay platelets into polymeric matrices enabled exploration of various filler/matrix combinations on mechanical properties. However, a fundamental understanding of the connections amongst the microstructure and macroscopic properties of polymeric based nanocomposites are yet to be fully explored to optimize the truly multifunctional property potential of polymer nanocomposites....
Show moreIn recent years the blending of 0-, 1-, and 2- dimensional inorganic fillers such as POSS, carbon nanotubes, and nano-clay platelets into polymeric matrices enabled exploration of various filler/matrix combinations on mechanical properties. However, a fundamental understanding of the connections amongst the microstructure and macroscopic properties of polymeric based nanocomposites are yet to be fully explored to optimize the truly multifunctional property potential of polymer nanocomposites. Polyhedral oligomeric silsesquioxane (POSS) offers a unique approach to examine the effect of molecularly dispersed nanoscopic fillers on rheological properties of entangled polymer melts. Experiments were performed using a nearly-monodisperse molecular weight polystyrene (PS) blended with varying amounts of two fully condensed POSS molecules surrounded with phenethyl and styrenyl groups. Due to the chemical similarity between these organic moieties surrounding the silicon-oxygen framework (SiO1.5) of POSS and PS, we were able to obtain polymer blends with molecular dispersed nanoscopic fillers needed to study the effect of intermolecular nanoparticle-nanoparticle interactions and the associated intramolecular interactions on the dynamics of the polymer chains. Differential scanning calorimetry (DSC), wide-angle X-ray diffraction (WAXD) and transmission electron microscopy (TEM) were used to characterize the thermal properties and morphologies of the POSS/PS blends. Oscillatory shear both small and large and/or tensile method was used to probe the dynamics of polymer chains as influenced by the addition of different chemical moiety of POSS at the glass transition, rubbery state and the terminal-flow transition regions. Further studies were done with varying molecular weight of PS for understanding of the chain length effects on the phase behavior of the blends, results obtained from the thermal and mechanical characterization methods were compared with morphological observations to better understand the structure-property relationship of polymers containing molecularly dispersed nanoscopic fillers.
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- Title
- The eff[e]ct of surface sulfonation on the surface free energy, and peel adhesion strength of polymer films
- Creator
- Park, Insik
- Date
- 1994
- Collection
- Electronic Theses & Dissertations
- Title
- The effect of neutralizing cations on the barrier characteristics of a surface sulfonated polystyrene film
- Creator
- Esbensen, Lone
- Date
- 1991
- Collection
- Electronic Theses & Dissertations
- Title
- The fractionation and molecular weight determination of emulsion polymerized polystyrene
- Creator
- Krell, Max Wallace
- Date
- 1949
- Collection
- Electronic Theses & Dissertations