Thematische Bibliographien / Elastomer spinning

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Auswahl der wissenschaftlichen Literatur zum Thema „Elastomer spinning“

Autor: Grafiati

Veröffentlicht am 18. Mai 2024

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Zeitschriftenartikel zum Thema "Elastomer spinning"

Honaker, Lawrence W., Shameek Vats, Manos Anyfantakis und Jan P. F. Lagerwall. „Elastic sheath–liquid crystal core fibres achieved by microfluidic wet spinning“. Journal of Materials Chemistry C 7, Nr. 37 (2019): 11588–96. http://dx.doi.org/10.1039/c9tc03836a.

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Kántor, József, Rudolf László Farmos und Attila Levente Gergely. „Optimization of Oil Sorbent Thermoplastic Elastomer Microfiber Production by Centrifugal Spinning“. Polymers 15, Nr. 16 (11.08.2023): 3368. http://dx.doi.org/10.3390/polym15163368.

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Fibrous structures are promising candidates for oil–water separation applications. In this study, we have produced poly(styrene-b-isobutylene-b-styrene) thermoplastic elastomeric fibers with the centrifugal spinning fiber production method. The optimal fiber production conditions were achieved when using a 25% w/w solution concentration in an 80/20 tetrahydrofuran/toluene (w/w) solvent system at 8000 rpm rotational speed. The produced fibers were bead-free and smooth-surfaced with a diameter of 3.68 µm. The produced fibers were highly hydrophobic and oleophilic, suggested by a water contact angle of 129° and the instantaneous absorption of the oil droplet. The oil absorption study showed fast absorption kinetics with 94% relative oil uptake after 1 min and a maximum of 16.5 g sunflower oil/g fiber. The results suggest that polyisobutylene-based thermoplastic elastomers could be promising alternatives in oil absorption applications.

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Toprakci, Ozan, Mukaddes Sevval Cetin und Hatice Aylin Karahan Toprakci. „Production of Styrene-[Ethylene-(Ethylene-Propylene)]-Styrene Block Copolymer (SEEPS) Microfibers by Electrospinning“. Material Science Research India 18, Nr. 1 (30.04.2021): 27–36. http://dx.doi.org/10.13005/msri/180104.

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Thermoplastic elastomer-based fibers have many advantages including lightness, flexibility, resilience. Styrene-[ethylene-(ethylene-propylene)]-styrene (SEEPS) is a styrenic block copolymer based thermoplastic elastomer and it can be used for many applications with many functions as a matrix, compatibilizer, modifier or adhesive. It has good resistance to oxidizing agents, weathering, aging, and it can be used under various conditions. In this study, SEEPS block copolymer fibers were electrospun. This study is the first study about the electrospinning of SEEPS block copolymer in the literature. Various spinning solutions were used, and process was optimized by changing the electrospinning conditions. Fiber morphology was analyzed by an optical microscope and fiber diameter distribution histograms were drawn. In order to understand the effects of polymer concentration on electrospinning, viscosity of the spinning solutions was measured. Although electrospinning conditions were found to be critical in terms of spinnability, solution concentration and viscosity were the most significant factors for obtaining flexible SEEPS based fibrous nonwoven mats.

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Regnier, Julie, Aurélie Cayla, Christine Campagne und Éric Devaux. „Melt Spinning of Flexible and Conductive Immiscible Thermoplastic/Elastomer Monofilament for Water Detection“. Nanomaterials 12, Nr. 1 (29.12.2021): 92. http://dx.doi.org/10.3390/nano12010092.

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In many textile fields, such as industrial structures or clothes, one way to detect a specific liquid leak is the electrical conductivity variation of a yarn. This yarn can be developed using melt spun of Conductive Polymer Composites (CPCs), which blend insulating polymer and electrically conductive fillers. This study examines the influence of the proportions of an immiscible thermoplastic/elastomer blend for its implementation and its water detection. The thermoplastic polymer used for the detection property is the polyamide 6.6 (PA6.6) filled with enough carbon nanotubes (CNT) to exceed the percolation threshold. However, the addition of fillers decreases the polymer fluidity, resulting in the difficulty to implement the CPC. Using an immiscible polymers blend with an elastomer, which is a propylene-based elastomer (PBE) permits to increase this fluidity and to create a flexible conductive monofilament. After characterizations (morphology, rheological and mechanical) of this blend (PA6.6CNT/PBE) in different proportions, two principles of water detection are established and carried out with the monofilaments: the principle of absorption and the short circuit. It is found that the morphology of the immiscible polymer blend had a significant role in the water detection.

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Dutta, N. K., N. Roy Choudhury, B. Haidar, A. Vidal, J. B. Donnet, L. Delmotte und J. M. Chezeau. „High-Resolution Solid State NMR Investigation of the Filler-Rubber Interaction: Part III. Investigation on the Structure and Formation Mechanism of Carbon Gel in the Carbon Black-Filled Styrene—Butadiene Rubber“. Rubber Chemistry and Technology 74, Nr. 2 (01.05.2001): 260–80. http://dx.doi.org/10.5254/1.3544949.

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Abstract This investigation describes the elastomer—filler interaction and its formation mechanism using solid state high-resolution, high-speed 1H magic-angle spinning nuclear magnetic resonance (NMR) spectroscopy. Pulsed NMR measurements were carried out on pure styrene-butadiene rubber (SBR), and solvent extracted carbon gels from freshly prepared and storage matured master batches. The effects of filler loading, storage maturation, severity of extraction and experimental temperature on the elastomer-filler interaction were examined and discussed. High resolution in NMR was achieved by higher temperature/low spinning rate, room temperature/high spinning and combined rotation and multiple-pulse spectroscopy (CRAMPS) techniques. High-speed magic-angle spinning (MAS) was found to be the most suitable method to achieve high resolution. Proton spin—spin relaxation time, T2, was measured successfully for each of the principal resonance species present in the samples. These measurements reveal an insight into the site-specific nature of the polymer—filler interaction. The relative immobilization of the dynamics of different protons, due to the presence of carbon black filler, and their temperature dependence evidence that the main chain vinyl proton is the most significantly immobilized one compared to the aromatic and methylene species. The effects of storage maturation and severity of extraction on the dynamics of the conformational jump have also been discussed. This work clearly demonstrates the importance of unsaturation on the bound rubber formation. It also provides first direct physical evidence confirming the hypothesis that bound rubber variation during the storage maturation is due to slow progressive replacement of short rubber chains by larger ones.

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Lee, Ji-Eun, Jin-Woo Lee, Jae-Wang Ko, Kyung-Il Jo, Hyun-Ju Park und Ildoo Chung. „Effects of Recycled Polymer on Melt Viscosity and Crystallization Temperature of Polyester Elastomer Blends“. Materials 16, Nr. 17 (04.09.2023): 6067. http://dx.doi.org/10.3390/ma16176067.

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As the world is paying attention to the seriousness of environmental pollution, the need for a resource circulation economy is emerging due to the development of eco-friendly industrial groups. In particular, the recycling of thermoplastic elastomers without cross-link has been highlighted in the plastics field, which has rapidly developed the industry. Growing interests have been directed towards the advancement of thermoplastic polyether–ester elastomer (TPEE) as a material suitable for the circular economy owing to its remarkable recyclability, both in terms of mechanical and chemical processes. Due to its excellent processability, simple mechanical recycling is easy, which is a driving force towards achieving price competitiveness in the process. In molding TPEE resin, it is essential to check the thermal properties of the resin itself because the thermal properties, including the melting and crystallization temperatures of the resin, depend on the design of the polymer. In this study, the thermal and mechanical performances of TPEE blends were evaluated by manufacturing compounds by changing the amount of recycled resin and additives. When the recycled resin was added, the melt flow index (MFI) changed rapidly as the temperature of the melt flow index measurement increased. Rapid changes in MFI make the fiber spinning process uncontrollable and must be controlled by optimizing the addition of compatibilizers. Based on the thermal property results, compatibilizers such as Lotader and Elvaloy series exhibited minimal change in glass transition temperature, even with greater amounts added. This makes them well-suited as compatibilizers for fiber spinning.

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Seyedin, Shayan, Joselito M. Razal, Peter C. Innis und Gordon G. Wallace. „A facile approach to spinning multifunctional conductive elastomer fibres with nanocarbon fillers“. Smart Materials and Structures 25, Nr. 3 (22.02.2016): 035015. http://dx.doi.org/10.1088/0964-1726/25/3/035015.

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Probst, Henriette, Konrad Katzer, Andreas Nocke, Rico Hickmann, Martina Zimmermann und Chokri Cherif. „Melt Spinning of Highly Stretchable, Electrically Conductive Filament Yarns“. Polymers 13, Nr. 4 (16.02.2021): 590. http://dx.doi.org/10.3390/polym13040590.

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Electrically conductive fibers are required for various applications in modern textile technology, e.g., the manufacturing of smart textiles and fiber composite systems with textile-based sensor and actuator systems. According to the state of the art, fine copper wires, carbon rovings, or metallized filament yarns, which offer very good electrical conductivity but low mechanical elongation capabilities, are primarily used for this purpose. However, for applications requiring highly flexible textile structures, as, for example, in the case of wearable smart textiles and fiber elastomer composites, the development of electrically conductive, elastic yarns is of great importance. Therefore, highly stretchable thermoplastic polyurethane (TPU) was compounded with electrically conductive carbon nanotubes (CNTs) and subsequently melt spun. The melt spinning technology had to be modified for the processing of highly viscous TPU–CNT compounds with fill levels of up to 6 wt.% CNT. The optimal configuration was achieved at a CNT content of 5 wt.%, providing an electrical resistance of 110 Ωcm and an elongation at break of 400%.

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Gursoy, Akin, Kamran Iranshahi, Kongchang Wei, Alexis Tello, Efe Armagan, Luciano F. Boesel, Fabien Sorin, René M. Rossi, Thijs Defraeye und Claudio Toncelli. „Facile Fabrication of Microfluidic Chips for 3D Hydrodynamic Focusing and Wet Spinning of Polymeric Fibers“. Polymers 12, Nr. 3 (10.03.2020): 633. http://dx.doi.org/10.3390/polym12030633.

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Microfluidic wet spinning has gained increasing interest in recent years as an alternative to conventional wet spinning by offering higher control in fiber morphology and a gateway for the development of multi-material fibers. Conventionally, microfluidic chips used to create such fibers are fabricated by soft lithography, a method that requires both time and investment in necessary cleanroom facilities. Recently, additive manufacturing techniques were investigated for rapid and cost-efficient prototyping. However, these microfluidic devices are not yet matching the resolutions and tolerances offered by soft lithography. Herein, we report a facile and rapid method using selected arrays of hypodermic needles as templates within a silicone elastomer matrix. The produced microfluidic spinnerets display co-axially aligned circular channels. By simulation and flow experiments, we prove that these devices can maintain laminar flow conditions and achieve precise 3D hydrodynamic focusing. The devices were tested with a commercial polyurethane formulation to demonstrate that fibers with desired morphologies can be produced by varying the degree of hydrodynamic focusing. Thanks to the adaptability of this concept to different microfluidic spinneret designs—as well as to its transparency, ease of fabrication, and cost-efficient procedure—this device sets the ground for transferring microfluidic wet spinning towards industrial textile settings.

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Hu, Weiguo, Maria D. Ellul, Andy H. Tsou und Sudhin Datta. „Filler Distribution and Domain Size of Elastomer Compounds by Solid-State NMR and AFM“. Rubber Chemistry and Technology 80, Nr. 1 (01.03.2007): 1–13. http://dx.doi.org/10.5254/1.3548166.

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Abstract Solid-state NMR methods were used to characterize the filler distribution in rubber blends and domain size of thermoplastic vulcanizates (TPV). Correlation between filler content and magic angle spinning (MAS) 13C and 1H NMR signal linewidth was established, and filler content in each component of the rubber blends was determined. In IIR/BR and BIMS/BR blends, carbon black enriches in BR phase. Comparison of the carbon black enrichment in both blends suggests that BIMS has a slightly stronger interaction with fillers than does IIR. Results obtained from AFM analysis were compared with NMR observations. Spin diffusion NMR was demonstrated to be useful for quantifying the amount of interfacial component in TPV. Its advantages — ease of quantification and high sensitivity for smaller domains — make it a complementary approach to microscopic techniques for elastomer morphology characterization.

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Mehr Quellen

Dissertationen zum Thema "Elastomer spinning"

Wade, Mary E. „Engineering of Elastomeric Biomaterials and Biomimicry of Extracellular Matrix for Soft Tissue Regeneration“. University of Akron / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=akron1478000902817738.

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Chung, Sang Won. „Vascular tissue engineering scaffolds from elastomeric biodegradable poly(L-lactide-co-&-caprolactone)(PLCL) via melt spinning and electrospinning“. 2006. http://www.lib.ncsu.edu/theses/available/etd-03292006-025436/unrestricted/etd.pdf.

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Buchteile zum Thema "Elastomer spinning"

Knight, David P., und Fritz Vollrath. „Spinning an Elastic Ribbon of Spider Silk“. In Elastomeric Proteins, 115–35. Cambridge University Press, 2003. http://dx.doi.org/10.1017/cbo9780511546327.008.

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Konferenzberichte zum Thema "Elastomer spinning"

Kang, Xiao, und Alan Palazzolo. „Simulation, Test and Mitigation of 1/2X Forward Whirl Following Rotor Drop Onto Auxiliary Bearings“. In ASME Turbo Expo 2019: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/gt2019-91645.

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Abstract 1/2X forward whirl repeatedly occurred after a test rotor spinning at 5,800 rpm was dropped onto ball bearing type auxiliary bearings AB, utilized as a backup for magnetic bearings. The measured contact forces that occurred between the rotor and the auxiliary bearing during the ½X subsynchronous vibration were about thirteen times larger than the static reaction force. The vibration frequency coincided with the rotor-support system natural frequency with the rotor at rest on the auxiliary bearing AB, an occurred at ½ of the rotor spin speed when dropped. The test rig provided measurements of rotor-bearing contact force, rotor orbit (vibrations), and rotational speed during rotor drop events. A simulation model was also developed and demonstrated that parametric excitation in the form of a Mathieu Hill model replicated the measured 1/2X forward whirl vibrations. The simulation model included a nonlinear, elastic-thermal coupled, ball bearing type auxiliary bearing model. The transient model successfully predicted the 1/2X vibration when the rotor was passing 5800RPM as well, and the simulation results quantitatively agreed well with the test results in the frequency domain. Several approaches for mitigating the 1/2X forward whirl were presented such as adding an elastomer O-ring or waviness spring in the AB support system. Measurements confirmed that adding AB dampers effectively mitigated the ½ subsynchronous forward whirl and significantly reduced the contact forces.

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Gibson, Phillip, und Heidi Schreuder-Gibson. „Production and Characterization of Nanoporous Polymer Membranes Produced by an Electrospraying Process“. In ASME 2000 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2000. http://dx.doi.org/10.1115/imece2000-1949.

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Abstract Electrospinning is a process by which high voltages are used to produce an interconnected membrane-like web of small fibers (10 to 500 nanometers in diameter). This novel fiber spinning technique provides the capacity to lace together a variety of types of polymers, fibers, and particles to produce ultrathin layers which are useful for chemical protective clothing. Of particular interest are electrospun membranes composed of elastomeric fibers, which are under development for several protective clothing applications. The various factors influencing electrospun nonwoven fibrous membrane structure and transport properties are discussed. Performance measurements on experimental electrospun fiber mats compared favorably with transport properties of textiles and membranes currently used in protective clothing systems. It was found that electrospun layers presented minimal impedance to moisture vapor diffusion required for evaporative cooling. There may be special considerations in the application of elastomeric membranes for protective clothing. Effects of membrane distortion upon transport behavior of the structure might be significant. Preliminary measurements have found that changes in elastomeric membrane structure under different states of biaxial strain were reflected in measurements of air flow through the membrane. Changes in membrane structure were also evident in environmental scanning electron microscope images of the pore/fiber rearrangement as the membrane was stretched. Experimental measurements and theoretical calculations show electrospun fiber mats to be extremely efficient at trapping airborne particles. The high filtration efficiency is a direct result of the submicron-size fibers generated by the electrospinning process. Electrospun nanofiber coatings were applied directly to an open cell polyurethane foam. The air flow resistance and aerosol filtration properties correlated with the electrospun coating add-on weight. Particle penetration through the foam layer, which is normally very high, was eliminated by extremely thin layers of electrospun nanofibers sprayed on to the surface of the foam. Electrospun fiber coatings produce an exceptionally lightweight multifunctional membrane for protective clothing applications which exhibits high breathability, elasticity, and filtration efficiency.

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