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 77 for “"mechanochemical"”.
-
Mechanochemical activation at solid interfaces
… Ion Mass Spectroscopy (ToF-SIMS), confirmed that mechanochemical activation occurring only in active specimens above the threshold activation stress between 149 MPa and 163 MPa. Analysis of the resulting fluorescence showed an ‘on-off’ activation, not observed in bulk mechanochemically active …
-
Mechanochemical Triggers for Self -Healing Polymers
Mechanochemical triggers based on the electrocyclic ring opening of both trans and cis substituted benzocyclobutenes was studied. The products of mechanically-accelerated ring opening were studied by trapping experiments. Ultrasound induces ring opening at 10°C, whereas thermal activation only …
-
Polymer architecture effects on mechanochemical reactions
… a significant role in influencing these types of mechanochemical reactions in polymers. This research aims to identity the governing rules of force transduction in polymer chains by studying various polymer architectures. To achieve this goal, an efficient characterization technique that allows …
-
Mechanophore-Linked Polymers for Studying Mechanochemical Response
… on the effect of molecular architecture on mechanochemical reactivity. Finally, we were able to realize a self-assessing mechanochromic material that directly couples mechanical energy to structural response, by incorporating a SP mechanophore into elastomeric and glassy materials.
-
Force-induced mechanochemical reactions in polymeric systems
… the use of phase separated polymers as new mechanochemical systems. Utilizing the nature of different polymers to segregate into microdomains, polymers with complimentary reactive functionalities, isolated in phase separated domains, could be brought in contact with each other by means of …
-
Mechanochemical Reaction Development for Addition, Elimination, and Isomerization
… polymers and in bulk polymeric materials. Mechanochemical reactions have been widely used in mechanocatalysis, release of small molecules and protons, biasing and probing reaction pathways, stress reporting, stress strengthening and degradable polymers. Mechanochemical reactions involve …
-
Mechanochemical pattern formation in the cellular actomyosin cortex
… and mechanical deformations in evolving mechanochemical systems in vivo due to their experimental accessibility and wealth of attainable biochemical patterns. In Chapter 2, I utilize endogenous fluorescent markers embedded in the actomyosin mesh to probe the spatiotemporal surface strain …
-
Molecular Force Sensors. Molecular insights into mechanochemical signal conversion
Contains fulltext : 149859.pdf (Publisher’s version ) (Open Access)
-
Mechanochemical synthesis and evaluation of rubber-thermoplastic polymer blends
… two phases, which may take place as a result of mechanochemical reaction, could not be achieved, and the thermoplastic rubber produced was essentially a physical blend. The role of free-radical initiators such as benzoyl and dicumyl peroxide, on the behaviour of NR/PP(60/40) blends was …
-
The mechanochemical modification of polyolefins using reactive modifier systems
… reinforced polypropylene (PP) composites by the mechanochemical modification of the PP. The modification of the PP was carried out by reactive processing of the PP with a modifier in a Buss Ko-Kneader. Two main types of modifier were evaluated one type based on N-substituted maleimides the others …
-
Mechanochemical transformations: Bridging the gap between global and local kinetics
… rapidly growing research subjects in chemistry. Mechanochemical reactions are generally performed in ball mills, where the powders are subjected to forging events during individual collisions. Precisely the complex milling dynamics make the investigation of the reaction kinetics on a local scale …
-
Development of Novel Slow-Release Micronutrient Fertilizers Using Mechanochemical Synthesis
… investigated the possibility of applying a green mechanochemical synthesis method for the formulation of boron (B) and molybdenum (Mo) fertilizers. More generically, the aim was to combine sustainable engineering and fertilizer manufacturing. The thesis consists of 6 chapters, including an …
-
Mechanochemical Understanding of Metal-Coordinated Polymers Using Simulation and Experiment
Metal-coordination bonds have the capacity to reform after rupture, thereby enabling dynamic, tunable, and reversible (self-healing) mechanical properties. Several biological organisms, such as marine mussels (Mytilus) and marine worm jaws (Nereis virens), have been found to take advantage of these …
-
Structural Mechanisms of F-actin Mechanochemical Regulation and Flexible Network Assembly
<p>The actin cytoskeleton integrates physical and chemical cues from a cell's environment to instruct its behavior, coordinating processes including cell migration, organelle dynamics, and endocytosis. Actin-binding proteins (ABPs) specify actin filament (F-actin) organization to build micron-scale …
-
Mechanochemical preparation of multi-component pharmaceutical materials for enhanced physicochemical properties
An extremely large volume of new chemical entities, as well as existing active pharmaceutical ingredients (APIs), on the market, possess sub-optimal physicochemical properties; particularly, their solubility. The synthesis of multi-component pharmaceutical systems, including the lesser-studied …
-
A study of mechanochemical reactions of spin traps in hydrocarbon polymers
The identification and quantification of spin adducts and their reduction products (>NOH, >NOR) formed from nitroso compounds and nitrones in EPR and PP during spin trapping techniques have been examined. The nitroxyl yield and polymer bound nitroxyl percentage formed from these spin traps were …
-
The photochemical and mechanochemical ring opening of cyclobutene from first principles
… dynamics to examine the photochemical and mechanochemical ring opening of cyclobutene. We use the ab initio multiple spawning (AIMS) method in order to examine the short time dynamics of cyclobutene. We have integrated the COLUMBUS software package into AIMS, which contains analytical …
-
Multiscale characterization of mechanochemical reactions in mechanophore-crosslinked polymers under shear loading
… new strategies are employed to impart productive mechanochemical response to polymeric materials. These mechanoresponsive materials possess the ability to respond to an applied global force through a local chemical reaction. In synthetic polymers, mechanochemical response is achieved through the …
-
A quantitative and predictive model for mechanochemical kinetics and its experimental validation
… a physically sound and quantitative model for mechanochemical kinetics did not. Truly taking advantage of all that mechanochemistry offers for the design of novel mechanoresponsive and actuating materials requires a clear conceptual framework describing how and why mechanical force affects …
-
Mechanochemical approaches to MOF glasses and the thermal response of amorphous MOFs
… We study the local structure and properties of mechanochemically produced and melt-quenched ZIF glasses, showing the similarities of materials produced by both routes. Beyond the work on glass forming ZIFs, we investigate the thermal response of mechanochemically amorphised ZIFs. Specifically we …
Page 1 of 4