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 237 for “"elastomers"”.
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On the mechanics of deformation and fracture of elastomers and porous elastomers
Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2025-05-01
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Modeling of magnetorheological elastomers
Magnetorheological elastomers (MREs) are composite materials whose mechanical properties can rapidly and reversibly change with the application of a magnetic field. MREs are composed of a non-magnetic polymer matrix embedded with magnetic particles. These materials can also demonstrate …
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Bound antioxidants in elastomers
… temperature or during the vulcanization of the elastomers at 160°C. Mixed alkyl, aryl secondary amines are shown to react only at the alkyl substituted amino group. Mono substituted sodium salt of dihydric phenols were initially used to facilitate reaction with the rubbers but this was found …
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Radiation induced degradation of elastomers.
An attempt has been made to evaluate the kinetics of the thermal and combined thermal/radiative degradation of a peroxide cured polydimethylsiloxane elastomer (PDMS), and a vinylidene fluoride-hexafluoropropylene elastomer (Viton E60-C),by chemical stress relaxation measurements. It was observed …
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Set behaviour of epichlorohydrin elastomers
Traditionally Epichlorohydrin (ECO) elastomers are cured by thiourea (ETU)-Lead (PbO) curing systems. However, owing to the current concerns regarding health, safety and the environment such systems are now classified as relatively high risk systems. ECO elastomers are widely used as seals and …
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Development of Sustainable Thermoplastic Elastomers
… were examined for their utility as thermoplastic elastomers. Poly(acetylsalicylic ethyl methacrylate) was found to be a suitable replacement for polystyrene, with a glass transition temperature above room temperature. The morphology and mechanical properties of ALA were comparable to that observed …
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Thermomechanics of nano-filled elastomers
… of nanoparticles into engineering thermoplastic elastomers affords engineers an opportunity to formulate flexible, tough and multifunctional polymer nanocomposites that potentially rival the most advanced materials in nature. Development of these materials is difficult since thermodynamic and …
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Fully-renewable and degradable thermoplastic elastomers.
… of completely-biorenewable thermoplastic elastomers. Polymenthide (PM), a soft biorenewable polymer derived from (-)-menthol, is immiscible with PLA and was utilized as the middle block in a PLA-containing ABA triblock copolymer. Tensile measurements demonstrated impressive elongations and …
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Biodegradable Thermoplastic Elastomers and Smart Composites
… is a need for biodegradable thermoplastic elastomers for a variety of medical applications. This dissertation aims at (i) developing and characterizing biodegradable elastomers and (ii) developing and characterizing biodegradable smart composites, both to be used as biomaterials. First, in …
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3D PRINTING OF ELASTOMERS AND APPLICATIONS
… can be controlled. Here, functional elastomers have been developed and manufactured by 3D printing. Dielectric elastomers with ultra-high permittivity have been formulated, printed and characterised. Also, conducting elastomer with very low hysteresis and self healing abilities have …
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Dielectric elastomers for space robotics applications
Soft robots, devices with deformable bodies powered by soft actuators, may fill a hitherto unexplored niche in space. All space-bound payloads are heavily limited in terms of mass and volume, due to the cost of launch and the size of spacecraft. Being constructed from flexible materials allows many …
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Disclinations in Homogeneously Deformed Nematic Elastomers
A nematic elastomer is a rubber-like solid formed by cross-linking of a polymeric fluid that includes nematic liquid crystalline molecules as side- or main-chain elements. This thesis explores issues concerned with disclinations---which are tubular neighborhoods in which the material is isotropic …
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Hot micro-embossing of thermoplastic elastomers
… process used to fabricate devices. Thermoplastic elastomers (TPEs) provide a potential alternative to PDMS. Soft and rubbery at room temperature, TPEs become molten when heated and can be processed using traditional thermoplastic fabrication techniques such as injection molding or casting. One …
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Synthesis and radiation stability of silicone elastomers.
A wide range of polymer samples based upon polydimethylsiloxane (PDMS) have been subject to gamma irradiation, and the subsequent effects analysed using a variety of techniques. The preparation of a series of blends and block copolymers of PDMS containing small amounts of polystyrene (PS) is …
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Pressure-Property Relationships in High-Performance Elastomers
High-performance elastomers, hydrogenated nitrile butadiene (HNBR), and fluoroelastomer (FKM), widely used in high pressure gas environments, have attracted significant interest from both fundamental research and industrial development. The changes in the glass transition temperature (Tg) and gas …
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Properties of elastomers for small-joint replacements
… the viscoelastic and related properties of elastomers such as silicones and polyurethanes (suggested as a possible substitute for silicones in the implants) and to relate the properties to how an implant may perform in vivo. The viscoelastic properties of medical-grade silicones and …
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On the Continuum-Mechanics of Nematic Elastomers
… laws of thermodynamics. We consider only nematic elastomers that are incompressible and microstructurally inextensible. In our treatment of these material constraints, we start with a mathematical decomposition of the dependent fields based on the geometry of the constraint manifold. This …
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Statistical physics of isotropic-genesis nematic elastomers
"Isotropic-genesis nematic elastomers (IGNEs) are materials that exhibit fascinating properties such as a remarkable softness in elasticity and do not undergo long-range nematic ordering, even at low temperatures. These materials are formed via the following process. Consider a melt or solution of …
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Magnetic and Mechanical Properties of Ultrasoft Magnetorheological Elastomers
<p>Magnetorheological elastomers (MREs), composite materials consisting of magnetic particles embedded in a non-magnetic elastomeric matrix, can reversibly modulate their mechanical and magnetic properties through tuning the applied magnetic field <em>H</em>. Recently, ultrasoft MREs have received …
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