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 30 for “"Thermoplastic Elastomers"”.
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Development of Sustainable Thermoplastic Elastomers
… with targeted properties appropriate for thermoplastic elastomer applications. Well-defined polymers with desired compositions and controlled molecular weight distributions were successfully synthesized using reversible addition fragmentation chain transfer (RAFT) polymerization. SAS …
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Fully-renewable and degradable thermoplastic elastomers.
… the investigation 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 …
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Biodegradable Thermoplastic Elastomers and Smart Composites
<p>There 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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Hot micro-embossing of thermoplastic elastomers
… to the curing 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 …
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Structure-Property Relationships of Polyisobutylene-Block-Polyamide Thermoplastic Elastomers
<p>Thermoplastic elastomers (TPEs) are a class of polymer fit for a wide variety of applications due to their customizability. In the synthesis of these types of materials, an elastically-performing polymer, deemed the “soft block,” is combined with a stiffer “hard block” polymer, each of which can …
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Development of Thermoplastic Elastomers with Improved Elastic Properties Based on Semicrystalline Block Copolymers
… and characterization of two novel types of thermoplastic elastomers (TPEs), exhibiting improved elastic properties compared to commercially available systems, is described. The first type comprises multiblock copoly(ether ester)s with semicrystalline hard segments and triblock copolymer soft …
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Imidazole-Containing Polymerized Ionic Liquids for Emerging Applications: From Gene Delivery to Thermoplastic Elastomers
Novel imidazole-containing polyelectrolytes based on poly(1-vinylimidazole) (poly(1VIM)) were functionalized with various hydroxyalkyl-substituents to investigate the influence of charge density and hydrogen bonding on nonviral DNA delivery. Copolymers with higher charge densities exhibited …
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Evaluation of the economic feasibility of core-shell baroplastic polymers and a comparison to traditional thermoplastic elastomers
… They have the potential to replace traditional thermoplastic elastomers in many applications. To quantitatively determine the competitiveness of baroplastic materials in current markets, a detailed cost model was developed. Embedded in the cost model is a polymer flow model that predicts …
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Thermomechanics of nano-filled elastomers
… incorporation 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 …
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Highly Tough, Stiff, and Transparent Poly(Methyl Methacrylate) Composites Incorporating Thermoplastic Elastomer Nanofibrils
… High aspect ratio nanofibrils of three different thermoplastic elastomers (i.e., thermoplastic polyester elastomer, polyether block amide, and thermoplastic polyurethane) are developed and incorporated into poly(methyl methacrylate) (PMMA) to fabricate polymer-polymer composites that are not only …
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Designing Acrylic Block Copolymers with Multiple Hydrogen Bonding or Multiple Ionic Bonding
… which enables many applications including thermoplastic elastomers and energy storage devices. Inspired by complementary hydrogen bonding interactions between nucleobase pairs in DNA, a series of bioinspired nucleobase-acrylate monomers such as adenine acrylate (AdA), thymine acrylate …
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Incorporation of silica into baroplastic core-shell nanoparticles
… equivalent to or better than those of commercial thermoplastic elastomers, more can be done to improve upon individual aspects of the mechanical properties, such as elastic modulus. This work looks at creating baroplastic nanocomposites with the goal of improving upon the mechanical properties. To …
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Development of a Lung Surrogate Model for Assessing Biomechanical Responses to Underwater Explosions (UNDEX)
… mechanical behavior of human lungs, utilizing thermoplastic elastomers (TPE) and polyurethane foam to replicate the elastic and porous nature of lung tissue and alveolar sacs. Material characterization tests were conducted to simulate quasi-static deformation through uniaxial tensile tests and …
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Micro-and macromechanics of single crystal and polygrannular lamellar block copolymers
… copolymers (BCPs) are a relatively new class of thermoplastic elastomers. Their macromolecular chain consists of covalently bonded repeating blocks of thermoplastic and elastomeric molecular chains. When given the thermodynamic freedom, the chain constituents phase separate into domains of …
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Linking Thermophysical Transitions and Rheological Properties to Polymer Foaming Outcomes with Carbon Dioxide
… high-pressure characterization and foaming of thermoplastic elastomers and seeks to link polymer thermophysical and rheological properties to polymer foaming outcomes with carbon dioxide as a physical blowing agent. A major focus of this dissertation has been the development of novel …
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Synthesis and characterization of linear and star-branched butadiene-isoprene block copolymers and their hydrogenated derivatives
… these linear and star-branched copolymer into thermoplastic elastomers. Hydrogenation successfully converted the soft polybutadiene blocks into hard semicrystalline polyethylene segments, while the central polyisoprene blocks resulted in the formation of amorphous alternating rubbery copolymers …
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Studies of the cationic polymerisation of vinylic and energetic cyclic ether monomers
… are expected to be used in the synthesis of thermoplastic elastomers.
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Multifunctional Multimaterial Fibers for Sensing and Modulation in Wearable and Biomedical Applications
… fiber sensors by incorporating composite thermoplastic elastomers through the thermal drawing process (Chapter 2). Additionally, the dissertation explores the use of the thermal drawing technique to create multifunctional ferromagnetic fiber robots capable of navigation, sensing, and …
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Synthesis and Characterization of Well-Defined Poly(1,3-Cyclohexadiene) Homopolymers and Copolymers
… for the development of novel high temperature thermoplastic elastomers, with excellent elastomeric properties (percent elongation = 745 %, tensile strength = 7.2 MPa). Atomic force microscopy in combination with differential scanning calorimetry verified the presence of microphase separation …
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