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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 53 for “"Polymethyl methacrylate"”.

  1. Pyrolysis and Flamelet Model for Polymethyl Methacrylate in Solid Fuel Sc(ramjet) Combustors

    Pace, Henry RogersVirginia Tech2024

    … combustion and regression of solid model fuel polymethyl methacrylate (PMMA). The diffusion flame between the fuel and oxidizer was studied numerically using a solid fuel decomposition and melt layer model to simulate convection and pyrolysis of the material. This model was validated using new …

    vt Repository record

  2. Calorimetric behavior of methacrylic polymers

    Hubbell, Douglas O.Virginia Polytechnic Institute1966

    … determine the enthalpies and specific heats of polymethyl methacrylate, polydimethylaminoethyl methacrylate, polycyclohexyl methacrylate, polyallyl methacrylate, and polyethyl acrylate from 120 to 300°C, and to determine a method for estimating their specific heats. Enthalpies of the selected …

    vt Repository record

  3. ΜΕΛΕΤΗ ΤΩΝ ΜΕΤΑΠΤΩΣΕΩΝ ΤΩΝ ΜΑΚΡΟΜΟΡΙΑΚΩΝ ΑΛΥΣΙΔΩΝ ΣΤΗΝ ΠΕΡΙΟΧΗ ΤΩΝ ΣΥΝΘΗΚΩΝ Θ

    Τσιτσιλιάνης, ΚωνσταντίνοςUniversity of Patras1987

    … STUDY OF DILUTE SOLUTIONS OF POLYSTYRENE POLYMETHYL METHACRYLATE AND POLYVINYL-2-PIRIDINE VERSUS TEMPERATURE SHOWED THAT THE MACROMOLECULARECHAINS UNDERGO AN ABRUPT LOWERING OF THEIR DIMENSIONS ABOVE THE Θ CONDITIONS. THIS TRANSITION IS ATTRIBUTED TO AN ABRUPT CHANGE OF THE FLEXIBILITY OF …

    greece Repository record

  4. Low-voltage spatial-phase-locked scanning-electron-beam lithography

    Cheong, Lin LeeMassachusetts Institute of Technology2010

    … the resists hydrogen silsesquioxane (HSQ) and polymethyl methacrylate (PMMA). Unlike electronbeam lithography at higher voltages, LVEBL has minimal proximity effects and is not resolution-limited by these effects. The fabrication of ultra-thin photoresist grids is investigated and the secondary …

    mit Repository record

  5. Implementation of viscoelastic Hopkinson bars

    Curry, RichardDepartment of Mechanical Engineering2011

    … bars. In this dissertation, Polycarbonate, Polymethyl Methacrylate and Nylon are considered for use as Hopkinson bars. Conventional Hopkinson bar analysis cannot be used on the polymeric bars due to the viscoelastic nature of the bar material. As stress waves propagate along the length of …

    cape-town Repository record

  6. ΜΕΛΕΤΗ ΤΩΝ ΠΟΛΥΜΕΡΩΝ ΕΥΡΙΣΚΟΜΕΝΩΝ ΕΝ ΔΙΑΛΥΣΕΙ ΕΝΤΟΣ ΔΥΟ ΜΕΡΙΚΩΣ ΑΝΑΜΙΓΝΥΟΜΕΝΩΝ ΥΓΡΩΝ ΘΟΛΟΜΕΤΡΙΚΑ ΚΑΙ ΙΞΩΔΟΜΕΤΡΙΚΑ ΑΠΟΤΕΛΕΣΜΑΤΑ

    Στάικος, ΓεώργιοςUniversity of Patras1986

    … POLYSTYRENE (PS), POLYETHYLENEGLYCOLE (PEG), POLYMETHYL-METHACRYLATE (PMMA). THE TURBIDIMETRIC RESULTS SHOWED THAT A SMALL QUANTITY OF THE POLYMER PROVOKES AN IMPORTANT DISPLACEMENT OF THE COEXISTENCE CURVE OF THE TWO LIQUIDS TOWARDS HIGHER TEMPERATURES. THIS DISPLACEMENT IS RELATED WITH A …

    greece Repository record

  7. Design and development of desktop fiber and fabric manufacturing system for advanced materials

    Kim, David Donghyun.Massachusetts Institute of Technology2020

    … included fibers with Polycarbonate(PC) core and Polymethyl Methacrylate (PMMA), hollow fibers with PC and PMMA, and 3 layer fiber with Polystyrene (PS) cladding, Polycaprolactone (PCL) layer, and PS core. These fibers were used for neural probing and cell scaffold.

    mit Repository record

  8. A patterning process utilizing a nanoimprint lithography for fabrication of planar perpendicular patterned magnetic media

    Grove, Robert, III2016

    … ability to pattern a 60 nanometer thick film of polymethyl methacrylate (PMMA) into 45 nanometer high pillars with a density correlating to 258 Gbits/in<sup>2</sup>over a 100 μm<sup>2</sup> area.</p>

    rowan Repository record

  9. Micromechanics of toughening in polymeric composites

    Sharma, RajdeepMassachusetts Institute of Technology2006

    … localized crazing followed by failure [e.g., polymethyl-methacrylate (PMMA), polystyrene (PS)], or cavitation-induced brittle failure under high triaxiality [e.g., polycarbonate (PC)]. Judicious choice of polymer composites alleviates the above concerns by spreading the inelastic deformation …

    mit Repository record

  10. Thermo-mechanical stress relief analysis in PMMA and 6000 series aluminum

    Stephens, Scott, S.B. (Scott A.). Massachusetts Institute of TechnologyMassachusetts Institute of Technology2014

    … of thermal gradients on residual stresses in polymethyl methacrylate (PMMA). A downhill quench from 95 C to 15C is able to create a deflection of 2.36 millimeters, evidence of residual stress. A subsequent uphill quench from -40 to 100 degrees reduced the deflection by 37 percent. The finite …

    mit Repository record

  11. Bottlebrush Polymers: A Pathway to Engineering Surfaces and Interfaces

    Mah, AdelineUniversity of Houston2018

    … with random copolymer poly (styrene-r-methyl methacrylate) side-chains in a blend of two immiscible homopolymers, polystyrene and polymethyl methacrylate. We determined that bottlebrush composition and architecture will control the morphology of the blends and identified the conditions that …

    houston Repository record

  12. Analytical Approaches for Analyzing Microplastics Using Pyrolysis Gas Chromatography Mass Spectrometry and Accelerated Solvent Extraction

    Peña Benavides, Manuel G2027

    … (PVC), polypropylene (PP), polystyrene (PS), and polymethyl methacrylate (PMMA) – were consistently detected and quantified in all biosolid samples. Across both WWTPs, PE dominated total polymer mass, followed by PVC, with PP and PS present at intermediate concentrations and PMMA occurring at the …

    cuny Repository record

  13. Hot embossing as a method for rapid prototyping microfluidic devices

    Nguyen, Khanh H. (Khanh Huy)Massachusetts Institute of Technology2013

    … functional high aspect ratio micro feature onto Polymethyl methacrylate (PMMA). The aspect ratio of features ranged from 10:1 to 4,000:1. Optimal embossing parameters used a pressure of 3.5kN, hold time of 12 minutes, tool temperatures of 140°C and substrate temperature of 130°C to produce parts …

    mit Repository record

  14. An experimental investigation of the breakup of a viscoelastic non-newtonian fluid in a supersonic stream

    Chadwick, Kenneth MichaelVirginia Tech1990

    … the test runs was diethylmalonate thickened with polymethyl-methacrylate, which has the characteristics of being viscoelastic. A limited number of test runs were made with glycerin in order to make a comparison between the behavior of Newtonian and viscoelastic non-Newtonian fluids. Several areas …

    vt Repository record

  15. The Study of Initiation Systems and Formulations for the Development of a Novel Silorane Biomaterial

    Weiler, Rachel AnnUniversity of Missouri--Kansas City2015

    … years. The current commercially available polymethyl methacrylate (PMMA) based bone cements have been used since the 1960’s with little change to their composition. They provide strength and longevity for total joint replacements, however they are not without their disadvantages. Issues …

    umkc Repository record

  16. SPACE CHARGE LIMITED DIELECTRIC BREAKDOWN, OR: HOW I LEARNED TO STOP WORRYING AND LOVE APPROXIMATIONS

    Hoppis, Noah2025

    … In this work, breakdown in electron irradiated polymethyl methacrylate is described by a new 1D space charge limited front (SCLF) model that reconceives breakdown as a propagating front rather than a diffuse event. To quantify embedded charge distributions and validate model predictions of …

    maryland Repository record

  17. Characterizing Bone Turnover in Osteoarthritic Bone Marrow Lesions in Human Knees Using Tetracycline Histology

    Rachel, KlassenGraduate Studies2025

    … tibial plateaus on the in vivo MRI images before polymethyl methacrylate embedding and sectioning. BIOQUANTOsteo and paired T tests were used to measure differences in mineral appositional rate (MAR), bone formation rate (BFR/BS), and mineralizing surface (MS/BS) on histological sections. Five …

    calgary Repository record

  18. Treatment planning for manifold multi-ion particle therapy

    Alabd, Roumani2023

    … different energies in a single target material (polymethyl methacrylate). The library is then adapted for the pencil beam geometry and energy spread of a specific accelerator beamline; next, a raster grid of beam positions is constructed to cover the target volume, and the weighting of individual …

    uts Repository record

  19. Studies of physical properties of novel lithium polymer electrolytes.

    Idris, RazaliDe Montfort University2001

    … SO percent epoxidised natural rubber (ENRSO) and polymethyl methacrylate grafted natural rubber were employed as polymer hosts. In this study the ionic conductivity, thermal, FTIR spectroscopy and morphology have been determined for both unplasticised and plasticised polymer electrolyte systems …

    de-montfort Repository record

  20. Design and Analysis of a Reusable N2O-Cooled Aerospike Nozzle for Labscale Hybrid Rocket Motor Testing

    Grieb, Daniel Joseph2012

    … PMMA stands for polymethyl methacrylate, a thermoplastic commonly known by the brand name Plexiglas<sup>®</sup>. N<sub>2</sub>O is the molecular formula for nitrous oxide.</p> <p><a href="http://digitalcommons.calpoly.edu/cgi/ir_submit.cgi#_ftnref2">[2]</a> …

    calpoly Repository record

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