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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 20 for “"Silicones"”.
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Surface morphology of hydrogels and silicones correlates with conditions of controlled fracture
Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2025-12-01
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Properties of elastomers for small-joint replacements
Silicones are used to manufacture finger and wrist joints. However these joints have fractured prematurely in vivo. There is a lack of literature on the mechanical properties of silicones. The aim of this thesis was to investigate the viscoelastic and related properties of elastomers such as …
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Synthesizing Self-Healing and Recyclable Silicones Using the Diels-Alder Reaction as a Cross-Linker: Investigation of Various Dienes and Dienophile Systems
This thesis focuses on the synthesis of recyclable and self-healing polysiloxane elastomer networks. These features were achieved through the use of thermally reversible Diels-Alder (DA) and retro-Diels-Alder (rDA) reactions. In this work, for the model system, two different dienes (3 and 8) and …
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Hydrophile Polysiloxane als waschbeständige Textilhilfsmittel
… washing process of two different functionalized silicones on cotton fabric. The first, a polyquaternary polysiloxane - blockcopolymer, interacts by hydrogen bonding to the hydroxyl-groups of the cotton fibre. The second, a reactive functionalized polyquaternary polysiloxane-block-copolymer …
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The development of a process for the production of phenylchlorosilanes
… 1935, impetus was furnished to research on the silicones by the need for a material suitable for binders, varnishes, and adhesives for newly-developed glass fabrics to be used in electrical insulation. The silicones are structurally analogous to glass and therefore seemed a likely starting point …
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Verarbeitung und Eigenschaften von Faserverbundkunststoffen mit Elastomermatrix
… based on polyurethanes and silicones are analysed with respect to their curing behavior and the mechanical properties. The fiber-matrix-adhesion of the silicone matrix resins on glass and aramid fibers was found to much lower than for the polyurethanes and silicones. The …
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Building integrated cell-based microsystems : fabrication methodologies, metrology tools and impact on cellular physiology
… fabrication technique based on photopatternable silicones. I show that these photopatterned silicones are able to generate free-standing structures, exhibit low autofluorescence, enable alignment with pre-patterned substrates, and are biocompatible. These unique properties enable the generation …
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Effects of Atomic Oxygen on Outgassing of Silicone Materials
… how atomic oxygen affects outgassing of silicones, which are of interest as atomic oxygen can alter the chemical composition of the surface of silicones. CV-2500, CV2-2289- 1, and SCV2-2590, three silicone elastomers that are products of NuSil Technology LLC, were tested. Significant …
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Silicone microspheres and disposable separation technology for gaseous analytes
… prepared via ultrasonic spray pyrolysis (USP). Silicones are found in an amazing number of commercial products including cosmetics, sealants, adhesives, lubricants, medical devices, and even food. Despite the prevalence of bulk silicones in today’s society, the synthesis of silicone …
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Sensing bending in a compliant biomimetic fish
… development and use of the sensors in stiffer silicones, they could be used in a closed loop system.
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Optimisation of silicone-based dielectric elastomer transducers by means of block copolymers – synthesis and compounding
… and sensors. As a dielectric elastomer, silicones have been used extensively in many applications, due to favourable properties such as thermal stability, non-conductivity, high gas permeability and low toxicity. However, silicones have a low dielectric constant and thereby low energy …
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Functionalized silicone composites: omniphobic coatings, microspheres and plastic explosives
Silicones are ubiquitous polymers containing a silicon-oxygen backbone and a variety of functional groups that can be tailored to very specific applications. Their flexibility, biocompatibility and relative inertness make them the ideal choice in materials as diverse as cosmetics, defoaming agents …
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Qualifizierung von Polysiloxanen für die langzeitstabile Konditionierung radioaktiver Abfälle
… adhesion was determined for condensation-cured silicones. The addition-cured materials had a lower adhesion, which was improved by the application of a priming coat. The outcome of these investigations is a wide spectrum of applications for polysiloxanes which can be used as firmly adhering …
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Thermal Stability of Al₂O₃/Silicone Composites as High-Temperature Encapsulants
… the performance of unfilled and Al₂O₃-filled silicones in weight-loss measurements and dielectric characterization. All test results on composites filed with Al₂O₃ micro-rods indicated that thermal stability increased with increasing filler loading. Thermogravimetric analysis (TGA) test …
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The implementation of artificial intelligence in robotics
… are constructed from compliant materials such as silicones, exhibit superior adaptability in unstructured environments and facilitate safer human–robot interactions. Despite these advantages, challenges still persist in achieving precise motion control and stiffness compliance. This research …
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Instability of Dielectric Elastomer Actuators
… of typical materials (acrylic elastomers or silicones), in the order of few unities, which governs the electromechanical coupling. Composite materials (reinforcing a soft matrix with stiff and high-permittivity particles) provide a way to overcome these limitations, as suggested by some …
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Design and Synthesis of Polymer Networks and Branched Polymers for Triggered Deconstruction of Self-Assembly
… properties of self-assembled graft copolymer silicones. We show that small structural variations to aliphatic pendant groups along copolymer backbones of free-standing self-assembling graft copolymers underpin enormous changes in material morphology and thermomechanical properties. Notably, we …
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Controlling and Exploiting Spiropyran-based Mechanochromism
… of</p><p>force distribution within filled silicones.</p><p>On the material and device scale, we have utilized mechanochromism for soft</p><p>and stretchable electronics, which are promising for a variety of applications such as</p><p>wearable electronics, human− machine interfaces, and soft …
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FUNDAMENTAL AND APPLIED MEASUREMENTS IN ICP-MS
… performed by HPLC coupled to sectorfield ICP-MS. Silicones ranging in molecular weight from 162 g mol'^ - 16500 g mol"^ were extracted from spiked human plasma and separated by size exclusion chromatography. Limits of detection ranged from 12 ng ml"' Si* for the 162 gmol'^ silicone to 30 ng ml'' …
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Soft Smart Interfaces for Bilateral Teleoperation with Distributed Tactile Haptic Feedback in Remote Medical Palpation
… the non-linearities introduced by the soft silicones used during manufacturing. All elements of such an interface are tested individually in unilateral teleoperation and are then integrated to achieve a fully functioning bilateral architecture. Part III focuses on the robot-patient …