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The permeability of fabrics is analyzed and modeled to understand and reduce void formation in composite manufacturing.

Resin Transfer Molding

Harze

Analysis of the permeability of textile preforms for void minimization in the RTM-process

The present work investigates the potential of selected amines to produce them in the form of carbamates and to use them for the production of epoxy resin foams.

Schaumstoffe

Harze, Epoxid

Thermische Mess- und Prüfverfahren

Carbamate-foamed epoxy resins – synthesis and properties

The melting process in single-screw extruders is crucial for process design, but its prediction remains difficult.  In research of suitable methods.

Extruder

Messgeräte für Partikel

Materialcharakterisierung

Prediction of the Melting Process of Plastics in Particle-laden Flows by Means of CFD-DEM

Continuous production of sustainable particle foams based on renewable materials

Partikelschäumen

Polylactid

Investigation of the foaming behaviour of polylactide and polylactide/poly(hydroxybutyrate-co-hydroxyvalerate) blends in particle foam extrusion

The aim of the present work is to develop the scientific understanding required for the development of flame retardant epoxy-carbamate-foams for the application in lightweight constructions.

Flammschutzmittel

Carbamate-foamed epoxy resins – Optimization of fire behaviour and mechanics through fillers

Establishment of suitable analytical methods for the characterization of individual particles and creation of new correlation references to welding behavior.

Polybutylenterephthalat

Schaumstoffe und Vorprodukte

Clarification of structure-property relationships during foaming and fusion of polybutylene terephthalate bead foams (E-PBT)

Analysis and model-based description of the bubble growth behavior as a function of the extensional viscosity function prevailing at the bubble edge.

Messgeräte für Kraft, Masse, Dehnung, Druck, Dichte, Viskosität, Drehmoment

Messgeräte für Viskosität

In-line characterization and prediction of the viscosity and the initial bubble growth behavior during foaming of blowing agent-loaded polymer melts

How can the effort required to test high-strength, highly rigid continuous fibre-reinforced structural components be reduced?

Impact-Tester

Non-destructive Testing of Fiber-reinforced Plastic Composites Using Sound Waves Emitted Into the Air by Local Defect Resonance

How hydrogen can be used as an energy source for aviation.

Modified epoxy resins for manufacturing of carbon fiber composite based cryogenic hydrogen vessels in the automated fiber placement

Thermoset polymers are not considered formable. Under certain conditions, however, they exhibit plastic behavior.

Zug-und Druckfestigkeitsprüfgeräte

Modelling the cure-dependent material behavior of thermoset matrices as a basis for material-adapted process and component design

A nozzle system optimised by CFD simulation makes immersive nozzle systems for the hot gas welding process suitable for series production and allows a reduction in heating time of up to 50 %.

Gas-, Autogenschweißen (WIG, MIG, MAG)

Prozesssimulation

Thermisches Fügeverfahren

Polyamide

Contribution to efficient hot gas welding of thermoplastics

The adhesion between LSR and thermoplastic is not only influenced by the applied polymers, but also by injection molding parameters, oven cure, surface treatment and storage conditions or environmental impacts.

Weichmacher

Mehrkomponenten-Spritzgießen

Silikonkautschuk

Structure-process-properties-relationships of injection molded thermoplastic-liquid silicone rubber-combinations

Blending of polymers has revealed a strong potential in tailoring plastic material properties for different applications.

Blend

Werkstoffprüfung, mechanisch

Properties of Micro- and Nanostructured PA66/PPE Polymer Blends

The present work aims to use accelerated weathering methods to develop a basic understanding of the formation of macro- to microplastics

Polyethylen

Polypropylen

From Macro- to Microplastics: Degradation Models and Extrapolation of Residence Times Under Abiotic Environmental Impacts

In this work, the fundamentals of process technology are established, aiming to produce a particle foam from polycarbonate for the first time.

Polycarbonat

Development of a continuous foaming process for novel expanded and expandable polycarbonate particle foams for structural applications

The aim of the dissertation is to develop a method for the numerical calculation of the concentration distributions.

Werkstofftechnische Prüfungen

Finite Methoden

A contribution to the characterisation and calculation of moisture distributions in polyamide 6

The dissertation addresses the solidification of thermoplastics after the molding process.

Machine Learning

Modellierung

Rheologie

Contribution to the prediction of the specific volume during the solidification process of plastic melts

Thermoplastic hybrid composites with natural fiber reinforcement have long been used in the automotive industry. Wood fibers have not yet been investigated in this context.

Hybridwerkstoffe

Holz

Naturmaterialien

Compoundieren

Development of processes and materials for thermoplastic hybrid composites with wood fiber reinforcement

The aim of the present work is to establish the necessary scientific basics for the processability of the combination of co-injection molding and FIM for complex material systems.

Spritzgießen

Thermoplastische Elastomere

Schaumspritzgießen

Co-Injection Molding: Sandwich Parts with foamed core and soft skin

How can the economic efficiency of the process be increased?

Spritzgießmaschinen, allgemein

Folientechnik (IMD, IML, FIM, u.a.)

Folien

Process model for the back molding of decorative films in the in-mold labeling technology

For the first time, it has been possible to consolidate foamed beads made of PBT into molded parts of high quality using superheated steam.

Polybutylene terephthalate bead foams with increased thermal stability – influence of an epoxy-based chain extender on processing and properties

Analytical description of process variables in polymer processing with planetary roller extruders; simulation of parameters such as pressure, temperature and residence time over the axial length of the extruder.

Modeling and preliminary estimation for the operating behavior of a planetary roller extruder

In this thesis, a novel route to obtain low-density (&lt; 100 kg/m<sup>3</sup>) extruded strand foams made from PBT with a fine cellular and uniform morphology (&lt; 500 µm) was presented.

Verarbeitungshilfsmittel, allgemein

Low-Density Reactive-Extruded Polybutylene Terephthalate Foams with Enhanced Compressive Properties

The aim of this work was to achieve transparent PC/PMMA-blends by continuous reactive extrusion while improving mechanical and optical properties.

Polymethylmethacrylat

Optische Mess- und Prüfverfahren

Transparent PC/PMMA blends: influence of functionalization on optical, morphological and mechanical properties

In order to bring flame-retardant properties into line with the liquid impregnation manufacturing processes for FRP in rail transport, new innovative flame retardant strategies are necessary.

Glasfasern / -matten

Kohlenstofffasern / -matten

Fiber-reinforced polymers in railway application – Flame retardant strategies for low-viscous epoxy resins

The influence of different coupling mechanisms on the structure-properties-relationships of highly filled, flame-retardant EVA/LLDPE based cable compounds.

Kabel

Halogen-free flame-retardant cable compounds based on highly filled EVA/LLDPE blend systems – Influence of the coupling mechanisms

For efficient lightweight construction fiber-reinforced plastics with a thermoplastic matrix are increasingly being used. How can these so-called organo sheets be optimised?

Verbundwerkstoffe / Werkstoffverbunde

Gewebe, technisch

Organobleche (gewebeverstärkte Thermoplast-Halbzeuge)

Thermoplaste

Short fiber modification of matrix-rich zones of fabric-reinforced thermoplastic composites by in-situ melt impregnation – influence on quasi-static properties

The production of particle foams with low densities and at the same time high molding quality is difficult, so the development of foamed polymer blends could simplify the entire processing.

Schäumen / Reaktive Verarbeitung

Study of expandable PLA particle foams – Influence of the blend system on processability and properties

This thesis deals with the development of novel materials with increased thermal conductivity and flame retardancy and their processing conditions for PCB substrate applications.

Elektrisch leitende Füllstoffe (Metalllegierungen, Ruß, Graphit)

Novel Thermally Conductive and Flame-Retardant Substrates for Printed Circuit Boards – Structure-Property Relationships

This thesis deals with the frictional heating of tribological polymer systems and their influence on tribological behavior.

Polyetherketon

Prüfen von Kunststoffen

Tribologie

On the Effect of the Heat Balance During Tribological Testing of Plastics

The infrared welding is a well-established process in the industrial production of parts in various applications. However, the complex emitter-material interaction, which influences the meltdown behaviour of the plastic parts, results in a high effort for the process setup. A smoking of the plastic parts is to observe in numerous industrial infrared welding processes. The correlations between the smoking of the plastic, its temperature and thermal-oxidative degradation as well as the mechanical properties of the resulting welds are unidentified yet. Furthermore, in industrial infrared welding processes often high changeover times and varying joining part temperatures are existent.

Contribution to Infrared Welding of Plastics in Industrial Manufacturing