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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 140 for “"Thermoplastics"”.
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Renewable Source Thermoplastics
<p>This thesis is concerned with developing renewable resource thermoplastic materials to replace existing non-renewable or possibly hazardous industry standard products.</p> <p>Cerenol TPU Incorporation</p> <p>Dupont has recently developed a renewable source Polyol (Cerenol) which is derived from …
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Siloxane modified engineering thermoplastics
Three block copolymer systems where one block was that of an engineering thermoplastic were examined. The first was that of polysulfone-polyarylester block copolymers where glassy-crystalline block copolymers were synthesized and characterized. The morphology of the block copolymers could be …
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Mechanical property characterization of recycled thermoplastics
Reuse of engineering thermoplastics retrieved from discarded computers, monitors and printers called as electronic shredder residue is described in the following thesis. Virgin, blend of virgin and recycled, and 100% recycled polymers such as acrylonitrile butadiene styrene (ABS) and polycarbonate …
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Fracture mechanisms in PVC and other thermoplastics
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 1984.
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Blends of Biodegradable Thermoplastics With Lignin Esters
… and melt processing. Among the biodegradable thermoplastics were cellulose acetate butyrate (CAB), poly-hydroxybutyrate (PHB), poly-hydroxybutyrate-co-valerate (PHBV), and a starch-caprolactone blend (SCL). Lignin esters included acetate (LA), butyrate (LB), hexanoate (LH), and laurate (LL). …
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Structure and relaxation studies of high performance thermoplastics
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 1995.
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Structure and properties of carbon fibre reinforced aromatic thermoplastics
In common with all composite materials, Aromatic Polymer Composite-2 (APC-2) is inherently expensive and as such any reclaimed material is potentially extremely valuable. In this work, pieces varying from 6.35-25.^mm square (0.25-1.Oinch) were cut from APC-2 single ply prepreg of thickness 0.125mm …
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Processing Behavior of Thermoplastics Reinforced with Melt Processable Glasses
… was concerned with evaluating the behavior of thermoplastics reinforced with melt processable phosphate glasses processed by techniques including injection molding, compression molding, and thermoforming. Thermoplastic resins consisting of polyphenylene sulfide (PPS), polyetherimide (PEI) and …
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Electromagnetic radiation calorimetry of thermoplastics, elastomers and composites systems
… for processing of glassy and semicrystalline thermoplastics, elastomeric polymers and composites was investigated. The goal of this research was to reveal the relationship between polymer structure and microwave absorptivity, and hence processability. The specimens were subjected to an …
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An investigation of friction and wear mechanisms in selected thermoplastics
These studies developed from Scanning Electron Microscope (SEM) observations of abrasive wear of a polymer disk sliding against metal asperity models. The investigator was unable to observe actual particle formation but did identify elastic and plastic deformation of the polymer, and a debris …
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Modification of Wood Fiber with Thermoplastics by Reactive Steam-Explosion
For the first time, a novel processing method of co-refining wood and polyolefin (PO) by steam-explosion was scientifically explored for wood-thermoplastic composites without a coupling agent. Traditional studies have addressed the improvement of adhesion between components of wood thermoplastic …
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Structural Changes and Chain Mobility During Processing of Bloodmeal-Based Thermoplastics
The purpose of this study was to use concepts from classical polymer physics to develop a fundamental understanding of the interdependent relationship between structure, properties and processing in NovateinTM Thermoplastic Protein (NTP). NTP is produced from bloodmeal, a by-product of the meat …
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Numerical stimulation of stress-induced crystallization of injection molded semicrystalline thermoplastics
… for stress-induced crystallization kinetics in thermoplastics, simulations of the injection molding process of semicrystalline plastics with the consideration of stress-induced crystallization have been scarce. A stress-induced crystallization model for semicrystalline plastics is proposed based …
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Structure-Property Relationships of 3D Printed Thermoplastics for Implantable Orthopedic Devices
… the structure and properties of 3D printed thermoplastics with relevant medical applications through fused filament fabrication (FFF) processing. Four FFF materials (PLA, PEEK, PEKK, and PPSU) are investigated with an emphasis on characterizing printed weld formation and the corresponding …
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Plasma-Enhanced Continuous Carbon Fibre-Reinforced Composites Manufactured from Recycled Thermoplastics
… Process development for integrating waste thermoplastics into long-service-life structural materials, such as long-fibre-reinforced composite tape, is especially encouraged. Notwithstanding the numerous tape manufacturing processes described in the original literature, their effectiveness …
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The in situ generation of liquid crystalline polymer reinforcements in thermoplastics
… work was to enhance the mechanical properties of thermoplastics by blending with liquid crystalline polymers (LCPs). Injection molding and sheet extrusion studies of blends of poly(ethylene terephthalate) (PET) with several LCPs were conducted with an emphasis on blends containing 50 wt % or less …
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Physical Aging and Characterization of Engineering Thermoplastics and Thermoplastic Modified Epoxies
… physical aging. Therefore, a set of engineering thermoplastics was examined with the goal of relating certain of their characteristic molecular dimensions to their mechanical and volumetric physical aging attributes.Another series of polymeric materials, based on a poly(ether sulfone) backbone, …
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Freeform, direct-write assembly of thermoplastics and glasses: Theory, practice, and applications
Additive manufacturing has received considerable attention in recent years for applications ranging from tissue engineering to architecture. Conventional approaches deposit material layer by layer, so that the final structure is a discretized approximation of the design along at least one …
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Dimensional Stability and Properties of Thermoplastics Reinforced with Particulate and Fiber Fillers
… and the structure-property relationships of thermoplastics reinforced with particulate and fiber fillers. The first part of this study was concerned with ascertaining the main causes of warpage observed for injection-molded thermoplastics reinforced with high aspect ratio fibers. Typically, …
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Modeling of Microstructures and Stiffness of Injection Molded Long Glass Fiber Reinforced Thermoplastics
… injection molded discontinuous fiber-reinforced thermoplastics. During the intensive injection molding process, severe fiber breakage arises in the plasticating stage leading to a broad fiber length distribution. Fiber orientation distribution (FOD) is another highly anisotropic feature of the …
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