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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 813 for “"copolymers"”.
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Mechanics of elastomeric copolymers
Elastomeric copolymers have been versatile materials for a broad variety of engineering applications of critical importance ranging from ballistic protective coatings to self-healing microstructures, possessing a backbone structure composed of alternate hard and soft segments, where the hard/soft …
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Rheological and Mechanical behaviour of Block copolymers, Multigraft copolymers and Block copolymer Nanocomposites
Block copolymers are commercially significant and fundamentally interesting class of polymeric materials. The ability to undergo interfacial thermodynamics-controlled microphase separation from a completely disordered state in the melt to a specifically defined ordered structure through …
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I. Copolymers and Terpolymers of Methylacrylonitrile Dimer. Ii. Copolymers of Symmetrical Aromatic Hydrocarbons
Made available in DSpace on 2014-12-05T19:35:52Z (GMT). No. of bitstreams: 1 0009029.pdf: 4044262 bytes, checksum: 84252c15ccbca36cc0a488da5bd8ef33 (MD5) Previous issue date: 1954
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Molecular Design of Crosslinked Copolymers
A complete methodology for the computational molecular design (CMD) of crosslinked polymers is developed and implemented. The methodology is applied to the design of novel polymers for restorative dental materials. The computational molecular design of crosslinked polymers using optimization …
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Ceramic nanostructures for block copolymers
… become smaller and smaller. In this work, block copolymers are harnessed in order to produce both porous and relief nanostructures. The interest in using these materials is due to the unique morphologies that block copolymers form and the fact that these nanostructures do so by self assembly. …
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Liquid crystalline multi-block copolymers
Lyotropic and thermotropic high strength liquid crystalline polymers have become an important area of research and development in polymeric, high performance materials. These materials have afforded excellent high temperature stability and high strength in the oriented direction, but not in the …
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Bottlebrush block copolymers for photonic materials
… a series of biocompatible bottlebrush block copolymers (BBCPs) have been synthesised based upon polyester or polyether macromonomers, including: polylactide, polycaprolactone, or polyethylene glycol. These BBCPs are self-assembled within emulsified droplets into microparticles with a photonic …
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Photo-responsive liquid crystal block copolymers/
Photo-responsive liquid crystal polymers (LCP) which contain azobenzene moieties have gained interest for their ability to change properties by merely irradiating them with the correct wavelength of light in the appropriate temperature range. Furthermore, they have been crosslinked for elasticity …
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Dynamics of rod-coil block copolymers
… domains of dissimilar geometries. Rod-coil block copolymers are an example of hybrid molecules that have attracted recent interest for organic electronics and biomaterials. This thesis uses theory, simulation, and experiments to better understand the mechanisms of molecular motion in entangled …
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Model adhesive studies using block copolymers
… of styrene-isoprene-styrene linear triblock copolymers as model hot-melt adhesives for titanium 6-4 alloy substrates. The block copolymer samples have narrow molecular weight distributions and styrene contents ranging from 20 to 60% by weight. For these systems a finite number of "dominant" …
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Fundamental adhesive studies of block copolymers
… technology. Styrene and isoprene based block copolymers were investigated 511 order to understand their adhesive properties. The structure of the microphase separated morphology of the materials studied was found to influence the adhesive behavior in applications as hot melt/structural type …
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Structure-property relationships in segmented copolymers
… relationships for various segmented copolymers were investigated. A number of mechanical and thermal characteristics were determined. The morphology was characterized by SAXS with respect to size and dispersion of domains; degree of phase separation and the domain interfacial …
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Structure-property relationships of multiphase copolymers
… sulfone) (PBS)-polydimethylsiloxane (PDMS) graft copolymers were synthesized by a free radical technique which involves the terpolymerization of butene, SO, and hexenyl functionalized polydimethylsiloxane macromonomers. The surface and bulk morphologies of a series of PBS-g-PDMS compolymers with …
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Engineering properties of multiphase block copolymers
Multiblock [-A-B-]<sub>n</sub> copolymers of bisphenol-A polycarbonate (I) and several poly(arylether sulfones) (II) have been investigated. The copolymers [see document for a diagram of copolymers (I) and (II)] were prepared from hydroxyl terminated oligomers (4,000 < M̅<sub>n</sub> < 30,000) by …
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Self-assembly behavior in hydrophilic block copolymers
Block copolymers are receiving increasing attention in the literature. Reports on amphiphilic block copolymers have now established the basis of their self-assembly behavior: aggregate sizes, morphologies and stability can be explained from the absolute and relative block lengths, the nature of the …
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Synthesis and characterisation of vinyl block copolymers
… and molecular weight distributions. Diblock copolymers of styrene-b-methyl methacrylate were synthesised at -78oC in THF in the presence of lithium chloride, and at ambient temperatures in toluene in the presence of aluminium alkyls. Studies in the presence of lithium chloride showed that the …
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Cell dynamical system approach to block copolymers
In this thesis we discuss a mesoscale model of block-copolymer (BCP) microphase separation dynamics based on a cell dynamics system (CDS) model. The model suggests a partial differential equation (PDE) model that allows us to find a close relation between the block copolymer and spinodal …
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