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.
Results
Showing 1 to 20 of 300 for “"PMMA"”.
-
PMMA Clay Nanocomposites
… (PCN) of poly(methyl methacrylate) (PMMA) and clay, were synthesised in-situ using a free radical suspension polymerisation technique. The weight fraction of clay in the PCN was systematically varied in order to understand the effect of clay on the physical properties of the resulting …
-
Zähmodifizierte PMMA-Hybridmaterialien mit Silikatskelettstrukturen
… / Eigenschafts-Beziehungen von neuartigen PMMA-Nanocompositen und anorganisch/organischen PMMA-Hybridmaterialien mit Silikatskelettstrukturen. Grundlage war die Steuerung der Superstruktur- und Netzwerkbildung durch nicht-wässrige Sol/Gel-Reaktionen kombiniert mit Selbstorgansiation von …
-
TiO2-PMMA nanohybrids of enhanced nanocrystallinity
… investigation has been conducted into TiO2-PMMA nanohybrids derived from wet chemistry methods, aimed at understanding the mechanisms responsible for the amorphous TiO2 phase in nanohybrids, which cannot be avoided under the conditions tolerable by PMMA matrix. The largely amorphous TiO2 …
-
Foam formation in a PMMA-methanol system
… a novel solid-state foaming process employing PMMA and methanol was developed. The process is partly analogous to the CO2-based nanofoam development process, but experimentally more accessible. This foam and its development were characterized and important mechanisms in the process for …
-
Process characterization of a PMMA hot embossing system
Microfluidics devices are important both for research use and medical application. To create these microfluidics devices, the hot embossing process is commonly used. In order to characterize this process to enable cycle to cycle control, a small-scale system was developed, using a hot embossing …
-
Sub-micron Patterning of ZnO-PMMA Hybrid Films
… ZnO nanoparticles and poly(methyl methacrylate) (PMMA) in a solvent. The ZnO particles were functionalized by adding nonanoic acid in order to facilitate the dispersion of the particles in a non-polar solvent. This suspension was spread onto substrate, imprinted with a patterned stamp, allowed to …
-
Gentamicin-PMMA beads: a clinical, pharmacokinetic and toxicological study
Contains fulltext : mmubn000001_027398811.pdf (Publisher’s version ) (Open Access)
-
ABAQUS simulation and optimization of PMMA hot embossing process
Increasing demand for microstructure replication in the industry has led to increasing attention to hot embossing technology. The hot embossing technology has developed a lot for the past few decades and been proved to be capable to replicate microstructure with high efficiency and high accuracy. …
-
Rheological characterization of LDPE and PMMA with optical methods
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemical Engineering, 1988.
-
Thermo-mechanical stress relief analysis in PMMA and 6000 series aluminum
… 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 element simulation of a …
-
Impact Mechanics of PMMA/PC Multi-Laminates with Soft Polymer Interlayers
… consisting of a poly(methyl methacrylate) (PMMA) front, polymer interlayer or adhesive, and polycarbonate (PC) back layer. Instrumentation of the gas gun is achieved with a shock accelerometer measuring contact force and optical displacement sensors recording deflection. Previous impact …
-
Morphological Studies of Crystallization in Thin Films of PEO/PMMA Blends
… oxide) (PEO) / poly(methyl methacrylate) (PMMA) blends has been reported. Studies have focused on the effects of the blend composition, PMMA molecular weight, film thickness, and crystallization temperature on the observed crystal morphology. As the blend composition was varied from 90 to …
-
Corrosion and Wear of Graphene-PMMA Nanocomposite Coatings Made by Drop-Casting
… incorporated into poly(methyl methacrylate) (PMMA), and deposited on the surfaces of 6061Al alloy using a dropcasting method. The incorporation of 1 wt. % GNP increased the tensile strength of PMMA from 33 MPa to 49 MPa. Further increase of GNP to 3 and 5 wt. % reduced the tensile strength to …
-
Deformation and fracture of PMMA with application to nanofoaming and adhesive joints
… state nanofoaming of polymethyl methacrylate (PMMA). These predictions may contribute to the development of polymeric foams with a thermal conductivity close to that of air. The second part of the thesis explores the fracture behaviour of structural adhesive (e.g. MMA)-based joints. An adhesive …
-
An analysis of through-hole punching in PMMA with varied process parameters
The ability to combine through-hole punching with a surface patterning during microembossing would greatly enhance the production of a variety of microfluidic devices. In support of that goal, a series of theoretical simulations and physical tests were performed to investigate the effect of …
-
Evaluation of Mechanical Properties of Provisional Fixed Partial Denture PMMA Material Containing Alumina Nanofibers
… available provisional fixed partial denture PMMA material. The hypothesis was that the addition of alumina nanofibers to commercially available PMMA resin will significantly increase its flexural strength, fracture toughness, and microhardness. Alumina nanofibers at 0.0 wt %, 0.5 wt %, 1.0 wt …
-
Dilute solution studies of molecular weight distributions of nitrocellulose, modified lignins and PMMA graft polymers
… The last part involved a fundamental study of PMMA-g-PMMA's having similar molecular weights but containing different levels of branching. Variable temperature GPC/LALLS/DV was employed to obtain molecular weight distributions, branching parameters, average chain dimensions and information on …
-
Collapsibility behaviour of ABS P400 and PMMA used as sacrificial pattern in direct investment casting process
… The patterns were made using ABS P400 and PMMA materials by two different types of technique which are Fused Filament Fabrication (FFF) and Polyjet technique. There were three different types of internal structures which are hollow, square and hexagon patterns. The thermal properties of the …
-
Improving Bioactivity and the Anti-Bacterial Properties of Two-Solution Bone Cement Containing Cross-Linked Polymethylmethacrylate (PMMA) Nanospheres (η-TSBC)
… containing cross-linked polymethylmethacrylate (PMMA) nanospheres (η-TSBC), as part of the polymer phase, were fabricated as the first step for optimization of cement viscosity for application of the material in the treatment of vertebral compression fractures using vertebroplasty (VP) and …
Page 1 of 15