TY - GEN A1 - Muscat, Dirk A1 - Voit, Johann A1 - Hefenbrock, Sophia T1 - Patentschrift DE102015014912B4 BT - Beschichtung für ein medizinisches Instrument, Verfahren zu dessen Beschichten und mit diesem Verfahren beschichtetes medizinisches Instrument N2 - Beschichtung für ein medizinisches In­strument, das nach seinem Einführen in einen menschlichen oder tierischen Körper mit dessen Körperflüssigkeit in Kon­takt gelangt, umfassend eine Materialzusammensetzung, die wenigstens ein Phosphorylcholin umfassendes Polymer enthält, dadurch gekennzeichnet, dass die Materialzusam­mensetzung für ein medizinisches Instrument, das auf sei­ner Oberfläche Polyurethan enthält oder das daraus gänzlich besteht, eine auf das medizinische Instrument aufbringba­re Haftungsvernetzungsschicht aus einem chemischen Haft­vermittler und einem mit diesem vernetzten Alkohol, min­destens einem zweiwertigen Alkohol mit zwei primären OH­Gruppen, und das wenigstens eine Phosphorylcholin um­fassende Polymer enthält, welches auf der Haftungsvernet­zungsschicht als gesonderte Schicht aufgebracht sowie auf dieser und gegebenenfalls mit dieser vernetzt ist. KW - Beschichtung Y1 - 2021 ER - TY - GEN A1 - Muscat, Dirk A1 - Moser, Stefan T1 - Offenlegungsschrift DE102008060087A1 N2 - Die Erfindung betrifft eine Brust­prothese, die aus einem schalenförmigen Körper aus einem weich-elastisch eingestellten Kunststoff besteht, der in Kunststoffolien zu einer oder mehreren Kammern einge­schweißt ist. Erfindungsgemäß wird das Füllmaterial mit polymeren Farbstoffen eingefärbt. Die Erfindung betrifft weiterhin ein Verfahren zum Färben von Brustprothesen. KW - Brustprothese Y1 - 2021 ER - TY - GEN A1 - Muscat, Dirk A1 - Moser, Stefan A1 - Reusch, Michaela T1 - Europäische Patentschrift EP2133042B1 KW - Brustprothese Y1 - 2021 ER - TY - CHAP A1 - Sigrüner, Michael A1 - Muscat, Dirk A1 - Strübbe, Nicole T1 - Investigation of the Bonding Behavior of Modified Polypropylene to a Concrete Matrix by Single Fiber Pull Out Tests BT - Amsterdam, Netherlands, 29 September – 1 October 2020 T2 - SAMPE Europe Conference Proceedings 2020 KW - Polypropylene KW - Single fiber pull-out test Y1 - 2020 ER - TY - CHAP A1 - Zenz, Vitus A1 - Muscat, Dirk A1 - Strübbe, Nicole T1 - Development of a new granulate feeding system for gas pressurized extrusion processes T2 - ANTEC 2023 N2 - One major problem of a continuous process like plastic extrusion is their incapability to deal with non-local gas pressure. This is an inherent problem because a continuous process has an open end in the feeding port where pressure can escape. In this study a novel feeding system was developed to enable granulate feeding into gas pressurized processes inside a single- or twin-screw extruder. With this apparatus gas pressure can be applied inside the extrusion process. The apparatus separates the pressurized extruder from the dosing equipment that feeds the extruder. It keeps the pressure inside the system while continuously feeding new material into the process. A small-scale prototype was designed for proof-of concept. The small size of the prototype was able to handle small amounts of granulates of around 100 - 200 g/h. An applied gas pressure of 8 bar was achieved. In future optimizations, throughput can be increased and maximum applied gas pressure towards 15-20 bar. KW - Plastic feeding KW - Granulate KW - Extrusion KW - Compounding KW - Reactive Extrusion Y1 - 2023 PB - SPE ANTEC ER - TY - JOUR A1 - Zenz, Vitus A1 - Muscat, Dirk A1 - Strübbe, Nicole T1 - So wird Bernsteinsäure aus Holzreststoffen gewonnen JF - Plastverarbeiter N2 - Die effiziente Umwandlung von lignocellulosehaltiger Biomasse wie Restholz ist eine wissenschaftliche sowie technologische Herausforderung weltweit. Die Technische Hochschule Rosenheim entwickelt gemeinsam mit Partnern ein neues Verfahren zur Herstellung von Bernsteinsäure aus Holzreststoffen. KW - Bernsteinsäure KW - Reaktive Extrusion Y1 - 2023 VL - 2023 IS - 04 SP - 22 EP - 25 PB - Hüthig GmbH CY - Heidelberg ER - TY - CHAP A1 - Herz, Jonas A1 - Sigrüner, Michael A1 - Krekemeyer, Markus A1 - Kazmi, Monis A1 - Schuster, Jens A1 - Muscat, Dirk A1 - Strübbe, Nicole T1 - INVESTIGATION OF AN INNOVATIVE WOOD-PLASTIC HYBRID LAID FABRIC FOR THE REPLACEMENT OF STEEL REINFORCEMENTS IN CONSTRUCTIONS T2 - SAMPE Europe 2021 Conference, Baden/Zürich, 29. - 30. Sept. 2021 KW - wood-plastic hybrid fabric Y1 - 2021 ER - TY - CHAP A1 - Herz, Jonas A1 - Sigrüner, Michael A1 - Walter, David A1 - Muscat, Dirk A1 - Strübbe, Nicole T1 - Coextruded Polymeric Bicomponent Fibers for Concrete Reinforcements T2 - SAMPE Europe Conference Proceedings 2022, Hamburg, 15. - 17. Nov. 2022 KW - Coextrusion KW - Bicomponent Fibers KW - Concrete Reinforcement KW - Polypropylene Y1 - 2022 ER - TY - JOUR A1 - Herz, Jonas A1 - Schusser, Verena A1 - Muscat, Dirk A1 - Strübbe, Nicole T1 - Cold-Drawn Wood-Filled Polybutylene Succinate Macro-Fibers as a Reinforcing Material for Concrete JF - Polymers N2 - The corrosive behavior of steel reinforcements causes issues in the concrete industry. To overcome this issue, alternative noncorrosive reinforcements such as polymer fibers could be used. However, as environmental protection becomes more important, sustainability must also be considered in the solution. An alternative to polymers based on raw oil is bio-based polymers. This study investigates the suitability of polymer fibers produced from polybutylene succinate together with cellulose and wood fillers as concrete reinforcements. Different mixtures of polybutylene succinate, cellulose, and wood fillers were created, and fibers were produced using a multiple drawing process. The fibers were tested using tensile tests, a single-fiber pull-out test, contact angle measurements, reflected light microscopy, density measurements, and thermogravimetric analysis. The fillers were shown to decrease the mechanical properties as the particle size and filler amount increased, resulting in a reduction in Young’s modulus and tensile strength of 55% and 70%, respectively, while adhesion to concrete increased with particle size from 0.31 ± 0.02 N/mm2 without filler to 0.90 ± 0.10 N/mm2 for the best-performing material combination. Reflected light microscopy images show changes in the fiber surface before and after pull-out. The fiber density decreased from 1.26 ± 0.05 g/cm3 to 0.91 ± 0.04 g/cm3 with an increasing filler amount and particle size for a compound with 10 weight percent of wood filler 1. The fiber thermal stability decreased slightly with the addition of filler. The greatest effect was a reduction in the temperature to ≈58 °C at 1% weight loss when 10 weight percent of wood was added. This study proves the possibility of using bio-based materials as concrete reinforcements. KW - fibers KW - compounding KW - extrusion KW - multiple drawing KW - polybutylene succinate KW - microcrystalline cellulose KW - wood particles KW - concrete Y1 - 2025 U6 - https://doi.org/https://doi.org/10.3390/polym17030403 VL - 17 IS - 3 PB - MDPI CY - Basel ER - TY - GEN A1 - Krey, Adrian A1 - Zenz, Vitus A1 - Widera, Karolin A1 - List, Manuela A1 - Muscat, Dirk A1 - Strübbe, Nicole ED - Ediciones Uniandes, T1 - Reactive Extrusion of Lignocellulosic Biomass to Produce Biopolymer Monomers using High-Energy Radiation and Catalytic Acids T2 - Proceedings of the 39th International Conference of the Polymer Processing Society (PPS-39) N2 - The increasing prevalence of bio-based and biodegradable plastics as an alternative to traditional plastics derived from crude oil is a noteworthy trend. Polybutylene succinate (PBS), a plastic produced from succinic acid, is among the promising materials for the future. However, the production of bio-based succinic acid through biotechnical processes in controlled environments presents challenges. This process leads to increased costs and is currently not economically competitive compared to crude oil-based succinic acid production. In addition to succinic acid, levulinic acid is another monomer produced in the same process. A novel approach to the digestion of biomass has been developed to address the issue of biotechnological production of bio-based platform chemicals. This innovative process employs microwave radiation, pressure, and temperature to convert wood residues into succinic acid and levulinic acid. Various catalyst concentrations and biomass ratios were tested in a batch process, with high-pressure liquid chromatography (HPLC) and liquid chromatography–mass spectrometry (LC/MS) analyses revealing the formation of succinic acid, levulinic acid, formic acid, and 2 oxoglutaric acid. The results demonstrate that microwaves combined with a metal salt catalyst can be used to produce platform chemicals from lignocellulosic biomass. To further advance the continuous production of PBS, a twin-screw extruder was modified and adapted after the successful results obtained from the batch processes. This setup enables additional experiments to evaluate the transferability of batch process results to continuous reactions, facilitating the scale-up and economic viability of the overall PBS production process in the future. KW - Succinic Acid KW - Levulinic Acid KW - Biopolymer KW - Microwave KW - Wood Y1 - 2024 U6 - https://doi.org/https://doi.org/10.51573/Andes.PPS39.SS.BBB.6 SP - 329 EP - 337 ER - TY - CHAP A1 - Herz, Jonas A1 - Lorenz, Katharina A1 - Muscat, Dirk A1 - Strübbe, Nicole T1 - Polymeric core-shell and mono-material fibers for concrete reinforcement T2 - AIP Conference Proceedings N2 - A reinforcement of concrete structures is needed because of the low tensile strength of concrete. Corrosion of the usually used steel reinforcments cause issues during time. Therfore, alternative reinforcements produced from non-corosive materials - like polymer fibers - become more interesting. A polymer fiber has to reach high mechanical properties and a good bonding ability to concrete. Both properties can be influenced by the selection of polymer and the used production process. Two polymers, polypropylene and aliphatic polyketone are tested within this study. First mono-material fibers of each material are produced and tested, later the materials are combined in a core-shell fiber. All fibers are produced by standard extrusion or coextrusion and a later drawing process. The mechanical properties are determined by tensile tests. The calculation of interfacial shear strength from single fiber pull-out tests allows an evaluation of the bonding ability. Additionally, fiber surface before and after pull-out is examined using reflected light microscopy. Contact angle measurements are done to evaluate possible influences of the surface energy and polarity. Density measurements are used to compare weight potential of the different mono-material and core-shell fibers. The results show good mechanical properties for all fiber materials. The interfacial shear strength is ≈ 2-3 times higher for fibers with polyketone compared to the ones with polypropylene at the fibers surface, which can be explained by higher surface energy and polarity of the polyketone compared to polypropylene and different surface deformation during pull-out. Lower densities are reached by fibers containing polypropylene. KW - polymer fibers KW - concrete reinforcement KW - core-shell fiber KW - coextrusion KW - polypropylene KW - polyketone Y1 - 2024 U6 - https://doi.org/10.1063/5.0204946 VL - 3158 IS - 1 ER - TY - RPRT A1 - Strübbe, Nicole A1 - Muscat, Dirk A1 - Sigrüner, Michael T1 - FHprofUnt 2016: Entwicklung maßgeschneiderter Polymerfasern zur Verbesserung der Lebensdauer und der mechanischen Eigenschaften von Beton (Conplasite) : Erfolgskontrollbericht FHprofUnt 2016: Projekt Conplasite : Berichtszeitraum: 01.08.2018-31.07.2021 Y1 - 2022 U6 - https://doi.org/10.2314/KXP:185433476X ER -