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 476 for “"methacrylate"”.
-
Characterisation of Silsesquioxane-Poly(Methyl Methacrylate) blends
Silsesquioxanes are a novel hybrid material that have advantageous properties intermediate of polymers and ceramics, due to their inorganic-organic molecular structure. Current research has focused on the potential of this hybrid to enhance conventional materials. Through the incorporation of …
-
Studies in the anionic polymerization of methyl methacrylate
… made of the anionic polymerization of methyl methacrylate using butyllithium and polystyryl lithium as initiators and using aluminium triisobutyl as a cocatalyst. The aspects of the polymerization that were examined were the effect of changing the order of addition of reagents, the temperature …
-
Mask Projection Microstereolithography 3D Printing of Gelatin Methacrylate
Gelatin methacrylate (GelMA) is a ubiquitous biocompatible photopolymer used in tissue engineering and regenerative medicine due to its cost-effective synthesis, tunable mechanical properties, and cellular response. Biotechnology applications utilizing GelMA have ranged from developing cell-laden …
-
Synthesis of novel methacrylate-containing polymers by anionic polymerization
… fashion over a wide range of conditions. Alkyl methacrylate monomers have received very sparce synthetic attention, however. This is presumably due to the difficulty in defining non-terminating polymerization conditions and, more importantly, the inability to arrive at anionic …
-
Methacrylate esters of cyclic alcohols of potential biomedical utility
… were synthesized. The corresponding methacrylate esters were also prepared and their spectroscopic data are presented. The commercially available 3-methyloxetan-3- ylmethanol was converted to its methacryloyl ester and the analytical data was presented.
-
Synthesis and Characterization of Responsive Poly(Alkyl Methacrylate) Topologies
Dimethacrylate monomers containing two cleavable tert-butyl ester groups were synthesized and utilized in the synthesis of star-shaped polymers. Star polymer coupling was achieved by reacting the living poly(alkyl methacrylate) using 2,5-dimethyl-2,5-hexanediol dimethacrylate (DHDMA) or dicumyl …
-
Study of the phase behavior of poly(n-alkyl methacrylate-b-methyl methacrylate) diblock copolymers and its influence on the wettability of polymer surfaces
… of the phase behavior of poly(n-alkyl methacrylate-b-methyl methacrylate) diblock copolymers and its influence on the wettability of the polymer surfaces were carried out. For this investigation two polymethacrylic systems differing only in the alkyl rest of one block: poly(pentyl …
-
Synthesis and application of specifically sulfated carbohydrates containing methacrylate functionality
… Hydrophobic polymers based on methyl methacrylate as well as hydrophilic polymers based on polysaccharides have been used as matrix-forming materials for tablets. A number of procedures for preparation of polysulfated carbohydrate derivatives have been published in literature1-3. …
-
Ultrasonically initiated free radical catalyzed emulsion polymerization of methyl methacrylate
<p>"The emulsion polymerization of methyl methacrylate initiated by ultrasound has been studied at ambient temperature using sodium lauryl sulfate as the surfactant.</p> <p>The source of the free radical for the initiation process was found to come from the degradation of the sodium lauryl sulfate …
-
Synthesis and characterization of poly[styrene-block-n-butyl methacrylate]
Thesis (B.S.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 1998.
-
Thermomechanical properties of polyhedral oligomeric silsequioxane- poly(methyl methacrylate) nanocomposites
Poly(methyl methacrylate)s (PMMA) containing polyhedral oligomeric silsesquioxane (POSS) nanoparticles (d [approx.] 1.5 nm) were subjected to heological, mechanical, and morphological tests to determine the effects that POSS has on the melt-state and solid-state properties of this commercially …
-
Anionic synthesis and characterization of alkyl methacrylate containing polymeric systems
The anionic synthesis of alkyl methacrylates has received sparse attention in comparison to the synthesis of nonpolar hydrocarbon monomers such as styrene or the dienes. The two major reasons for the sluggish synthetic development of this class of polar monomers are the protic impurities present in …
-
Fracture-induced mechanophore activation and solvent healing in poly(methyl methacrylate)
… SP-linked brittle polymers such as poly(methyl methacrylate) (PMMA), rubber nanoparticles can be incorporated into the matrix material. These nanoparticles facilitate the increased shear yielding necessary for SP activation during mechanical testing. Cross-linked SP-PMMA, containing 7.3 wt% …
-
Dendronized Amphiphilic Copolymers Synthesized from Methacrylate Derivatives as Potential Topical Microbicides
… means toward this goal. Novel dendritic methacrylate macromonomers––di-tert-butyl 4-(2-tert-butoxycarbonyl-ethyl)-4-[3-(2-methacryoloxyethyl)ureido]heptandioate (MI) and di-tert-butyl 4-(2-tert-butoxycarbonylethyl)-4-[3-methyl-3-(2-methacryoloxyethyl)ureido]heptanedioate (MIII)––were …
-
Friction, wear and lubrication of a poly(2-hydroxyethyl methacrylate) hydrogel
Poly(2-hydroxyethyl) methacrylate, (polyHEMA), hydrogels are synthesized for tribological study to investigate their potential for use as synthetic articular cartilage. A four factor, two level designed experiment was performed to evaluate friction and wear of polyHEMA. Tests were carried out using …
-
An investigation of the radiation polymerization of methyl methacrylate-kaolin clay composites
… polymerization of a 50-50 weight mixture methyl methacrylate (MMA) kaolin clay system. The effect of dose rate (7.35 - 24.9 rads per second), temperature (25 to 75ºC) and total dose on the percentage conversion of monomer to polymer was studied. The rate of formation of polymer at 25ºC in the …
-
Highly Tough, Stiff, and Transparent Poly(Methyl Methacrylate) Composites Incorporating Thermoplastic Elastomer Nanofibrils
… are developed and incorporated into poly(methyl methacrylate) (PMMA) to fabricate polymer-polymer composites that are not only highly tough but also stiff and transparent. PMMA was chosen as the matrix material because of its brittle nature and tremendous commercial value. This thesis explores …
-
Preparation of CO2-Switchable Poly(Methyl Methacrylate) Latexes by Surfactant-Free Emulsion Polymerization
… on the preparation of CO2 switchable poly(methyl methacrylate) latexes by surfactant-free emulsion polymerization. N,N-Dimethylaminoethyl Methacrylate (DMAEMA) was chosen as the functional comonomer to act as an in-situ generated surface active agent as well as the CO2 responsive agent. The azo …
Page 1 of 24