@inproceedings{ZenzMuscatStruebbe2023, author = {Zenz, Vitus and Muscat, Dirk and Str{\"u}bbe, Nicole}, title = {Development of a new granulate feeding system for gas pressurized extrusion processes}, series = {ANTEC 2023}, booktitle = {ANTEC 2023}, publisher = {SPE ANTEC}, year = {2023}, abstract = {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.}, language = {en} } @article{ZenzMuscatStruebbe2023, author = {Zenz, Vitus and Muscat, Dirk and Str{\"u}bbe, Nicole}, title = {So wird Bernsteins{\"a}ure aus Holzreststoffen gewonnen}, series = {Plastverarbeiter}, volume = {2023}, journal = {Plastverarbeiter}, number = {04}, publisher = {H{\"u}thig GmbH}, address = {Heidelberg}, pages = {22 -- 25}, year = {2023}, abstract = {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 Bernsteins{\"a}ure aus Holzreststoffen.}, language = {de} } @misc{StruebbeDirkZenz2023, author = {Str{\"u}bbe, Nicole and Dirk, Muscat and Zenz, Vitus}, title = {DEVICE FOR THE PRODUCTION OF BIOPOLYMERS FROM BIOMASS (EP4130532A1)}, editor = {European Patent Office,}, year = {2023}, abstract = {Pressure lock (10), extruding apparatus (50) for high pressure extrusion, process for producing biopolymers from biomass and use of the extruding apparatus for a process for producing biopolymers from biomass allowing continuous operation of a high pressure process.}, language = {en} } @inproceedings{SigruenerMuscatStruebbe2020, author = {Sigr{\"u}ner, Michael and Muscat, Dirk and Str{\"u}bbe, Nicole}, title = {Investigation of the Bonding Behavior of Modified Polypropylene to a Concrete Matrix by Single Fiber Pull Out Tests}, series = {SAMPE Europe Conference Proceedings 2020}, booktitle = {SAMPE Europe Conference Proceedings 2020}, year = {2020}, language = {en} } @article{SigruenerMuscatStruebbe2021, author = {Sigr{\"u}ner, Michael and Muscat, Dirk and Str{\"u}bbe, Nicole}, title = {Investigation on pull-out behavior and interface critical parameters of polymer fibers embedded in concrete and their correlation with particular fiber properties}, series = {Journal of Applied Polymer Science}, volume = {138}, journal = {Journal of Applied Polymer Science}, number = {28}, pages = {50745}, year = {2021}, abstract = {A crucial problem in concrete engineering is the corrosion of steel reinforcements. Polymer fibers as alternative reinforcement material can prevent corrosion; however, high adhesion to concrete and good fiber mechanics are necessary for polymers to be considered as an alternative reinforcement. This study tested different thermoplastic polymer materials to evaluate their level of adhesion to concrete. The adhesion properties of different self-drawn polymer fibers were analyzed by extracting the fibers from concrete using single fiber pull-out test (SFPT). To determine the adhesion mechanism, different polymer properties were analyzed and correlated to SFPT. Strong evidence was found that the fibers mechanical properties correlate with SFPT. Roughening the fiber surface increases the SFPT results significantly. While highly polar materials can support the adhesion process, a clear correlation could not be found. This study identifies high stiffness and roughness as the crucial properties of polymer fibers used in concrete engineering. If these factors can be engineered into the fiber, polymer fibers can present an alternative to steel in concrete reinforcement.}, language = {en} } @inproceedings{SigruenerMuscatStruebbe2021, author = {Sigr{\"u}ner, Michael and Muscat, Dirk and Str{\"u}bbe, Nicole}, title = {Influencing the bonding ability of polypropylene fibers to concrete by blend hydrophilization and reactive functionalization}, series = {IUPAC MACRO2020+, 48th World Polymer Congress, 16. - 21. May 2021}, booktitle = {IUPAC MACRO2020+, 48th World Polymer Congress, 16. - 21. May 2021}, year = {2021}, language = {en} } @article{SigruenerHueskenPirskawetzetal.2023, author = {Sigr{\"u}ner, Michael and H{\"u}sken, G{\"o}tz and Pirskawetz, Stephan and Herz, Jonas and Muscat, Dirk and Str{\"u}bbe, Nicole}, title = {Pull-out behavior of polymer fibers in concrete}, series = {Journal of Polymer Science}, volume = {61}, journal = {Journal of Polymer Science}, number = {21}, doi = {10.1002/pol.20230264}, pages = {2708 -- 2720}, year = {2023}, abstract = {The bond between polymer fibers and the surrounding cementitious matrix is essential for the development of concrete reinforcement. The single fiber pull-out test (SFPT) is the standard characterization technique for testing the bond strength. However, the different phases of debonding cannot be distinguished by the SFPT. This study investigates the debonding of different polymer fibers from the surrounding cementitious matrix with a modified SFPT and proposes methods to change the SFPT setup to generate more valuable information on the debonding mechanism. The SFPT was equipped with linear variable differential transformers (LVDT), digital image correlation (DIC) and acoustic emission (AE) analysis. The results demonstrate that the modified SFPT allows a better understanding of the different phases of debonding during fiber pull-out. Furthermore, bond strength values calculated by different methods reveal that the chemical bond of the investigated polymers is not different as reported by previous studies. Deformation measurements performed using LVDTs and DIC are suitable measuring techniques to characterize the debonding mechanism in SFPT. A correlation between recorded AE and debonding phases was not found.}, language = {en} } @inproceedings{SchusserSigruenerBogneretal.2023, author = {Schusser, Verena and Sigr{\"u}ner, Michael and Bogner, Stefan and Muscat, Dirk and Str{\"u}bbe, Nicole}, title = {Effect of Fillers on the Mechanical Properties of Drawn Polypropylene Fibers}, series = {International Conference on Composite Materials Belfast 2023 (ICCM 23), 30 July - 4 August 2023}, booktitle = {International Conference on Composite Materials Belfast 2023 (ICCM 23), 30 July - 4 August 2023}, year = {2023}, language = {en} } @article{SchmitzHaupertRuethingetal.2021, author = {Schmitz, Regine and Haupert, Frank and R{\"u}thing, Justus and Sigr{\"u}ner, Michael and Str{\"u}bbe, Nicole}, title = {Tribologische Charakterisierung von Polymerfasern unter Trockenreibung, Mischreibung und Hydrodynamik mittels einer optimierten Pin-on-Disc-Pr{\"u}fmethode}, series = {Tribologie und Schmierungstechnik}, volume = {68}, journal = {Tribologie und Schmierungstechnik}, number = {3-4}, pages = {13 -- 21}, year = {2021}, abstract = {Ausgehend von der herk{\"o}mmlichen Pin-on-Disc-Pr{\"u}fmethodik wurde ein Tribologiepr{\"u}fstand hinsichtlich seiner Leistungsf{\"a}higkeit zur Fasercharakterisierung optimiert und angepasst. Die Methodik wird erl{\"a}utert und erste Anwendungen im Bereich der tribologischen Charakterisierung von Einzelfasern werden vorgestellt. Der Pr{\"u}fungsablauf zur Untersuchung der Polymerfasern, deren Durchmesser nur einige 100 µm betragen, ist so generiert, dass eine Erfassung der Daten als Funktion der Zeit im Bereich von einigen 10 µm bis zu einigen 100 µm Faserverschleiß kontinuierlich w{\"a}hrend der Messung bereits in den ersten Minuten erfolgen kann. Der Pr{\"u}fmodus startet hierbei mit Linienlast und entwickelt sich dynamisch zur Fl{\"a}chenlast durch {\"A}nderung der Auflagefl{\"a}che der Faser w{\"a}hrend der Messung. Es wird gezeigt, dass Einzelfasern hinsichtlich ihrer Reibungs- und Verschleißeigenschaften in unterschiedlichen tribologischen Systemen charakterisiert werden k{\"o}nnen. Die Abh{\"a}ngigkeit der Verschleißraten von Fasermaterial, Oberfl{\"a}chenrauheit der Gegenk{\"o}rper und Schmiermittelraten wird dargestellt.}, language = {de} } @inproceedings{SchmitzHaupertRuethingetal.2021, author = {Schmitz, Regine and Haupert, Frank and R{\"u}thing, Justus and Sigr{\"u}ner, Michael and Str{\"u}bbe, Nicole}, title = {Tribologische Charakterisierung von Polymerfasern unter Trockenreibung, Mischreibung und Hydrodynamik mittels einer optimierten Pin-on-Disc-Pr{\"u}fmethode}, series = {Tribologie und Schmierungstechnik}, volume = {68}, booktitle = {Tribologie und Schmierungstechnik}, number = {3-4}, organization = {62. Tribologie-Fachtagung 2021}, pages = {13 -- 21}, year = {2021}, abstract = {Ausgehend von der herk{\"o}mmlichen Pin-on-Disc-Pr{\"u}fmethodik wurde ein Tribologiepr{\"u}fstand hinsichtlich seiner Leistungsf{\"a}higkeit zur Fasercharakterisierung optimiert und angepasst. Die Methodik wird erl{\"a}utert und erste Anwendungen im Bereich der tribologischen Charakterisierung von Einzelfasern werden vorgestellt. Der Pr{\"u}fungsablauf zur Untersuchung der Polymerfasern, deren Durchmesser nur einige 100 µm betragen, ist so generiert, dass eine Erfassung der Daten als Funktion der Zeit im Bereich von einigen 10 µm bis zu einigen 100 µm Faserverschleiß kontinuierlich w{\"a}hrend der Messung bereits in den ersten Minuten erfolgen kann. Der Pr{\"u}fmodus startet hierbei mit Linienlast und entwickelt sich dynamisch zur Fl{\"a}chenlast durch {\"A}nderung der Auflagefl{\"a}che der Faser w{\"a}hrend der Messung. Es wird gezeigt, dass Einzelfasern hinsichtlich ihrer Reibungs- und Verschleißeigenschaften in unterschiedlichen tribologischen Systemen charakterisiert werden k{\"o}nnen. Die Abh{\"a}ngigkeit der Verschleißraten von Fasermaterial, Oberfl{\"a}chenrauheit der Gegenk{\"o}rper und Schmiermittelraten wird dargestellt.}, language = {de} }