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.
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Showing 1 to 20 of 36 for “"chain mobility"”.
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Side chain mobility and hydration in homeodomain-DNA recognition
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Biology, 1998.
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Structural Changes and Chain Mobility During Processing of Bloodmeal-Based Thermoplastics
… were used to investigate thermal transitions and chain relaxation, accompanied by synchrotron based Fourier transform infrared spectroscopy (FT-IR) to investigate chain architecture and structural changes. Extrusion, injection moulding and mechanical testing were used to investigate macroscopic …
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Thermal Stability of Al₂O₃/Silicone Composites as High-Temperature Encapsulants
… interaction between filler surface and polymer chains. However, the interaction mechanism is not clearly documented. In this study, the effect of Al₂O₃ filler on thermal stability was first investigated by comparing the performance of unfilled and Al₂O₃-filled silicones in weight-loss …
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Structure-property relationships from molecular simulation of polymeric matrix composites
… point. Under the gelation point the enhanced chain mobility from bond exchange reactions is negligible compared to the chain mobility as a result of a lightly crosslinked network. Thermomechanical properties of CANs with different crosslink densities were correlated to overall free volume and …
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Development of a finite element method for light activated polymers
… by exploiting the difference in modulus and chain mobility through the glass transition temperature. However, in recent years, new SMPs have been developed that respond to other stimuli besides temperature; these can include electricity, magnetism, changes in chemical concentration, and even …
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Characterization of polyphenoxy-ethylphenoxyphosphazene-bulk sealant applications
Polymer chemistry has primarily been a main chain carbon-based science, but recently the usage of inorganic polymeric materials has increased with polyphosphazene research leading the way. The credit for the increased interest in the field of phosphazene chemistry arises from the unique physical …
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Microphase Separation Studies in Styrene-Diene Block Copolymer-based Hot-Melt Pressure- Sensitive Adhesives
… content in the adhesive blends. Polymer chain mobility was determined to be the dominant factor governing ordering kinetics, which depended on both the quench temperature and tackifier content in the blends. The addition of increasing amounts of tackifier eventually leads to a shift from …
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Supercritical carbon dioxide-processed resorbable polymer nanocomposites for bone graft substitute applications
… constructs is the restriction of polymer chain mobility. This restriction is a function of the positive interaction between polymer chains and the nanoclay. In vivo inflammation studies indicate biocompatibility of the constructs. Ectopic osteogenesis assays have determined that the …
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Mesoscale Modeling of Phase Behavior in Thin Films of Cylinder-Forming ABA Block Copolymers
… between the defect structures and the chain mobility in block copolymers is observed. In the systems studied, representative defect configurations provide connectivity of the minority phase in the form of dislocations with a closed cylinder end or classical disclinations with …
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Synthesis and Characterization of Nanoporous Copolymers with Potential Gas Storage Applications
… The incorporation of these functionalized, chain stiffening, Tg enhancing comonomers raised the Tgs of precursor polymers before they were crosslinked. Surface areas of these HCPs, obtained from nitrogen adsorption/desorption isotherms at 77 K, were up to 1058 m2/g. However, the surface …
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Finite Element Analysis to Investigate Lipid Absorption in UHMWPE Under Mechanical Loading
… from daily movements may increase polymer chain mobility, accelerating oxidative reactions and loss of integrity. This thesis presents two computational model to simulate the time-dependent diffusion of lipid species into crosslinked UHMWPE under mechanical loading. Two approaches were …
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Highly productive ester crosslinkable composite hollow fiber membranes for aggressive natural gas separations
… resistance by controlling the segmental chain mobility in the polymer; however, only relatively thick selective skin layers and lower separation productivity have been reported to date. On the other hand, the high cost of crosslinkable polymers makes the approach challenging, especially …
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Biophysical Analyses of Intermolecular Ion-Pairs in Protein-DNA Complexes
… complexes, ion pairs form between basic side chains, such as lysine and arginine, and the phosphate backbone of DNA. Moreover, ion pairs are found in dynamic equilibrium between two major states. While great strides have been made to improve the understanding of ion pair in protein-DNA …
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Estimating Movement from Mobile Telephony Data
… data sources used in the understanding of human mobility, social connection and information transfer. This thesis investigates techniques that can extract useful information from anonymised call detail records (CDR). CDR consist of mobile subscriber data related to people in connection with the …
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DIFFUSION CONTROLLED VINYL POLYMERIZATION
… behavior after the onset of the gel effect, the chain length dependence of the termination reaction should be considered.</p><p>A new method of handling polymerization kinetics with the chain length dependence termination reaction is proposed, which is largely independent of the form of the chain …
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Optically active photoresponsive multifunctional polymeric materials
… methacrylic polymers bearing in the side chain the chiral cyclic (S)-3-hydroxypyrrolidine moiety interposed between the main chain and the trans-azoaromatic chromophore, substituted or not in the 4’ position by an electron-withdrawing group. In these materials, the presence of a rigid …
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Influence of Solvent Removal Rate and Polymer Concentration on Ordering Kinetics of Block Copolymers in Solution
… the system, as a result of competition between chain mobility effects and thermodynamic effects that occur as polymer concentration increases away from the CODT. It was found that the Avrami exponent remained constant over all concentrations, and an empirical model was fit to find the various …
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Preparation and properties of micro- and nanocomposites based on high density polyethylene
… crosslink junctions which hinder polymer chain motion and reduce creep deformation. When particle size is reduced at constant filler volume fraction, the physical crosslink density increases such that chain mobility decreases significantly under stress. Finally, the creep behaviour of …
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PHYSICAL APPROACHES TO IMPROVE THE QUALITY OF GLUTEN-FREE PASTA
… complex to highlight differences in chain mobility and cristallinity of starch in rice pasta was investigated. Two pasta samples were produced starting from the same rice flour (RF) and using a conventional extrusion process without (Process A) and with (Process B) a preliminary …
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Overcoming Challenges in Reversible Addition–Fragmentation Chain Transfer Polymerization using Photoinduced Electron/Energy Transfer Catalysis
… limitations in reversible addition–fragmentation chain transfer (RAFT) polymerization. Both methods employ photoinduced electron/energy transfer (PET) catalysis to generate radicals within the polymerization system. PET catalysis was selected as the initiation pathway because the rate of radical …
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