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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 30 for “"Polymethyl Methacrylate (PMMA)"”.

  1. 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

  2. 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

  3. 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

  4. 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

  5. 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

  6. 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

  7. 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

  8. 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

  9. 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

  10. Highly Efficient Thermal Ablation of Silicon and Ablation in Other Materials

    Yu, Joe X. Z.2011

    … and potential feature sizes (< 100 µm) in polymethyl methacrylate (PMMA) unachievable by thermal ablation. The ablation mechanism here is Coulombic explosion (CE), which is a non-thermal process. Coupled with demonstrated manual and automatic feedback abilities of ICI, the processes shown …

    queens Repository record

  11. Design, Fabrication, and Testing of a 3D Printer Based Microfluidic System

    McMullen, Carlton A.2017

    … mold, (device 1), was fabricated from a sheet of Polymethyl methacrylate (PMMA) material, similar to Plexiglas. The device features were micro-engraved onto the face of the material. The second mold, (device 2), was fabricated from the use of fused deposition modeling (FDM) 3D printing. The …

    arkansas Repository record

  12. Method for Photopolymerization 3D Printing of Recyclable Thermoplastic Polymers

    Tumkur Mahesh, PrajwalMassachusetts Institute of Technology2024

    … the common polymers polyacrylonitrile (PAN) and polymethyl methacrylate (PMMA) to address the growing demand for low-waste production of high-resolution polymer parts with complex geometries in industrial-scale manufacturing. This new approach not only produces directly recyclable linear …

    mit Repository record

  13. Kontakto grafenas – metalas formavimas ir elektrinių savybių tyrimas /

    Lukša, Algimantas,Institutional Repository of Vilnius University2017

    … from copper foil onto SiO2/Si wafer using polymethyl methacrylate (PMMA) dissolved in chlorobenzene as supporting coating is described. Samples were analyzed using optical microscope and Raman spectroscopy methods. Three coatings with different concentration were prepared and analyzed. The …

    vilnius Repository record

  14. The Effect of Orientation on the Ignition of Solids

    Morrisset, David2021

    … in this study was conducted using cast black polymethyl methacrylate (PMMA or commonly referred to as acrylic). This study explores ignition parameters for PMMA in various orientations and develops a methodology through which orientation can be incorporated into existing ignition theory. An …

    calpoly Repository record

  15. Fast reverse osmosis through nanotube-based membranes: molecular dynamics study

    Suk, Myung eunUniversity of Illinois at Urbana-Champaign2010

    … (BNNT) and carbon nanotubes (CNT) compared to a polymethyl methacrylate (PMMA) pore, and a slightly higher water flux through BNNT as compared to CNT. The calculated permeation coefficient is in reasonable agreement with the theoretical single-file ""hopping"" model. Potential of mean force …

    uiuc Repository record

  16. Degradation of mechanical properties of bovine cortical bone during long-term whole bone storage.

    Carstens, LiaDepartment of Mechanical Engineering2025

    … results from compressive tests on cylindrical polymethyl methacrylate (PMMA) and aluminium (Al) specimens of varying heights against three alternative methods i.e. stress wave propagation, tensile extension, and three-point bending, each of which typi­cally require larger specimens. A high …

    cape-town Repository record

  17. Large Eddy Simulation of Boundary Layer Combustion

    Bravo, Luis Giovanni2013

    … supplied by a thermally-degrading flat sample of polymethyl methacrylate (PMMA) and the oxidizer corresponds to a cross-flow of ambient air with controlled mean velocity and turbulence intensities. Comparisons between numerical results and experimental data are made in terms of flame length, wall …

    maryland Repository record

  18. Optimisation of process parameters of high power CO2 Laser cutting for advanced materials

    Eltawahni, HayatDublin City University2011

    … molecular weight polyethylene (UHMWPE), polymethyl-methacrylate (PMMA) and glass fibre reinforced plastic (GFRP). A CW 1.5 kW CO2 Rofin laser is used to perform the cutting operations. Different models were successfully developed to predict the responses for each material and thickness …

    dcu Repository record

  19. Deformation and fracture of PMMA with application to nanofoaming and adhesive joints

    Van Loock, FrederikUniversity of Cambridge2019

    … of the deformation and fracture of methyl methacrylate (MMA)-based polymers in the context of void growth. The first part of the thesis focuses on the prediction of void growth during solid state nanofoaming of polymethyl methacrylate (PMMA). These predictions may contribute to the …

    cambridge Repository record

  20. Functionalization, growth and applications of single wall carbon nanotubes

    Wang, Yubing

    … of ceramic (silicon carbide, SiC) and polymer (polymethyl methacrylate, PMMA) nanocomposites with SWNTs, respectively. Electrochemically-induced functionalization of SWNTs by nitro groups and enzymes has been studied in some detail, whereas electrochemical hydrogen storage for fuel cell …

    njit Repository record

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