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 162 for “"processability"”.
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Cresol Novolac/Epoxy Networks: Synthesis, Properties, and Processability
… were crosslinked with bisphenol-A epoxy. The processability of oligomers containing thermally labile maleimides were limited to lower temperatures. However, sufficiently high molecular weight oligomers were necessary to obtain good network mechanical properties. Networks prepared from 1250 …
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Processability of Nickel-Boron Nanolayer Coated Boron Carbide
This dissertation work focuses on the processability improvement of B4C, especially the compaction and sintering improvement of B4C by applying a Ni-B nanolayer coating on individual B4C particles. A modified electroless coating procedure was proposed and employed to coat nanometer Ni-B layer onto …
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Void-Free Flame Retardant Phenolic Networks: Properties and Processability
… when compared to epoxy composites. Melt processability of phenolic/epoxy composites has been achieved through the use of latent nucleophilic initiators. Kinetics of the phenolic/epoxy cure reactions with latent initiators demonstrated that monomeric phosphine initiators yielded faster …
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A Hierarchy of Grammatical Difficulty for Japanese EFL Learners: Multiple-Choice Items and Processability Theory
… order was compared with the order predicted by processability theory and the order in which the structures appear in junior and senior high school textbooks in Japan. Because processability theory is based on natural speech data, a sentence repetition test was also conducted in order to compare …
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Optimization processability of ss316l used natural hydroxyapatite from waste tilapia fish bones in metal injection molding
Application of waste Tilapia Fish bones is introduced as a Natural Hydroxyapatite (NHAP) powder in metal injection moulding. Feedstock were prepared based on water atomized Stainless steel 316L (SS316L) and combination of NHAP powder bind with Low density Polyethylene (LDPE) and Palm stearin (PS). …
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The effects of polymeric binders on the processability and properties of composites made by suspension prepregging
… to themselves. The effects of the binder on the processability, properties, and performance of composites were assessed. It was found that the addition of the binder can affect both the matrix and the composite performance depending on the binder concentration and chemistry. For example an …
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Novel PLA-based materials with improved thermomechanical properties and processability through control of morphology and stereochemistry. A study in improving toughness and processability of PLA by blending with biodegradable polymers and the two PLA enantiomers PLLA and PDLA to accelerate crystallinity and heat resistance
Polylactic acid (PLA) is an aliphatic polyester, derived from sustainable natural sources that is biodegradable and can be industrially composted. This material has been in the spotlight recently due to its sustainability and properties. However it has been invented in 1932 by Carothers and then …
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Structure-property behavior of polyimide homopolymers, copolymers, and blends
… focused upon several methods by which the processability of polyimide systems may be improved. One method involved the utilization of a solution imidization technique in converting the poly(amic acid) intermediate to the fully cyclized polyimide. Another important method was the …
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The Interface Between Instruction Type and Learner Readiness in the Acquisition of Spanish Personal a and the Subjunctive
… implications, the former in terms of Pienemann's Processability framework and the latter regarding the potential impact of instruction type on the stage development of L2 Spanish learners.
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Thermoplastic Sizings: Effects on Processing, Mechanical Performance, and Interphase Formation in Pultruded Carbon Fiber/Vinyl-Ester Composites
… of the composite. These sizings affect the processability of the carbon fiber that translates into a composite with less fiber breakage and improved fiber/matrix adhesion. In addition, the interdiffusion of the sizing and the bulk matrix results in the formation of an interphase. This …
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Development of polymer bonded magnets with enhanced magneto-mechanical properties for high temperature and aggressive environments
… The research also relates to improvements in processability and mechanical performance of thermoplastics bonded rare earth magnets by blending a functional liquid crystal polymer with polymer matrix. The addition of liquid crystal polymer (LCP) to PPS-bonded Nd-Fe-B magnets provides enhanced …
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Nanoparticle Self-Assembly for the Synthesis and Processing of Ordered Nanocomposite Solids
… in the solution environment, limiting their processability outside of these narrow conditions. This work presents various methods for improving NCT superlattice stability and processability into polymer nanocomposites. These methods include the addition of free polymer to the assembly …
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Effect of Dairy Cow Diets on the Composition and Processing Characteristics of Milk
… Changes in milk composition affect milk processability and the yield and quality of dairy products. The overall aim of this thesis was to investigate the effect of different herbage allowance and feeding systems on seasonal changes in milk composition, biochemical, processing …
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Polymer Grafted Nanoparticles as Functional and Mechanically Robust Single-Component Composites
… filler loading and the mechanical robustness and processability of the composite. In this work, multiple strategies for bridging this gulf are presented and investigated in order to create highly-filled, single-component PGNP composites without compromising mechanical performance or …
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Mechanical and physical properties of particulate reinforced composites
… of particle size matching and mismatching on the processability, and the mechanical and physical properties of particulate reinforced composites is investigated in this study. These composites were made from dry powder-powder blends. Polymer and reinforcement materials were chosen, characterized …
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The effect of interchain transesterification reactions on the development of aromatic copolyesters
… to their unique combination of properties and processability. They are limited, however, due to high temperatures required for processing and limitations on achievable mechanical properties due to the anisotropic nature of the polymer. In an attempt to address these issues, a new thermosetting …
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Electromagnetic radiation calorimetry of thermoplastics, elastomers and composites systems
… structure and microwave absorptivity, and hence processability. The specimens were subjected to an electric field at 2.45 GHz either inside a rectangular waveguide or in a cylindrical resonant cavity applicator with less than 100 watts applied power. Both travelling wave modes and standing wave …
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Colloidal quantum dot based light emitting devices on silicon substrate
… optoelectronic applications. Moreover, solution processability of colloidal quantum dots makes processing and integration on the silicon platform easier. This thesis discusses the design and fabrication of colloidal quantum dot based light-emitting devices using inorganic materials on a silicon …
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Bio-inspired Design and Self-Assembly of Nucleobase- and Ion-Containing Polymers
… enhanced the mechanical strength and maintained processability of microphase-separated copolymers for thermoplastics and elastomers. A thermodynamically favored one-to-one stoichiometry of adenine and thymine yielded the optimal thermomechanical performance. Intermolecular hydrogen bonding of two …
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Alkynylated acenothiadiazoles and N-heteroacenes: synthesis, functionalization, and study of the optical properties for optoelectronic and sensory materials
… which display good charge carrier mobility, good processability, and stability towards oxygen and moisture. Alkynylated N-Heteroacenes fulfill many of these requirements. Substitution with alkyne groups as well as the introduction of the pyrazine subunit both inhibits oxidative degradation at …
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