The Danish Polymer Centre 1999/2000 - DPC

Characterization of polymer melts in elongation. (Ole Hassager).
The goal of this project is to understand the development of structure, molecular orientation and
stresses in polymeric melts under elongation. It is desired to understand how the ability of
polymers to form fibres is influenced by structural factors such as long chain branching.
Molecular theories suggest that the elongational viscosity is particularly sensitive to branching.
Hence the ultimate hope is to be able to construct an apparatus by which chain branching and
other structural characteristics may be measured. Ph.D. student Anders Bach is funded within the
project.
Tailoring of Bicontinuous Phase Structure (BPS) During Processing. (Jørgen Lyngaae-
Jørgensen).
The objective is to govern/predict the formation of bicontinuous phase structures in two phase
systems during flow in the whole volume fraction interval.
Structure and Properties of Materials with Microporous Structure. (Jørgen Lyngaae-
Jørgensen).
The objective of this project is to prepare micro porous foams with a controlled/tailored
microstructure, and to demonstrate the influence on the structural and micro mechanical
properties. Carbon foams are of interest because they have good engineering and mechanical
properties and are stable to high temperature and chemical environments.
2.4 Focus area: Advanced Processing Technologies
Modelling of sophisticated processing methods can be of valuable importance, as it may shortcut
elaborate trial and error based development. Advanced processing such as two-component
injection moulding and multi-layer extrusion can be used to create structured materials.
Production of components with micro and nanometer structures is another important research
area. Modelling is important to understand and examine different process geometries and
conditions.
Investigation of surface and microstructure formation in injection moulding of plastic
components. (Henrik Pedersen).
This project concerns the investigation of surface formation, on nano and micro scale, of
injection moulded polymer components under the influence of various processing conditions.
The purpose is twofold:
1. To develop commercial optical sensors based on injection moulded diffractive polymer chips
2. To develop techniques for generating optical verification holograms in conventional injection
moulded plastic components.
The techniques used include fabrication of various nano and microstructures in nickel shims,
which are inserted in conventional injection moulding equipment, variations of process
conditions and investigation of surface topography by optical photospectroscopy, atomic force
microscopy and optical microscopy.
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