vub wapenschild

Rheokinetic study of inhibited polyuethanes for resin transfer moulding

Using resin transfer moulding (RTM) a composite material can be made by injecting a resin through a fiber bed. More and more polyurethane based composite materials are being developed because of the better mechanical properties instead of the classical epoxy based composite materials. A disadvantage of polyurethanes is the high reactivity and reaction heat which leads to a more difficult to control processing. The viscosity which is temperature and conversion dependant is another important parameter in RTM. Insufficient knowledge about the changing viscosity can lead to air encapsulation, incomplete wetting,... which in return will lead to defects in the composite material.

In this PhD research first the polyurethane (PUR) and polyisocyanurate (PIR) reaction will be experimentally studied. To do this thermal analysis techniques will be used (DSC, dynamic rheometry and RheoDSC). The next step consists out of modeling the reactions, both PUR and PIR, using a mechanistic model. This is followed by rheokinetic modeling where the link between reaction and viscosity is made. Finally the rheokinetic model can be implemented in a finite element software in which the RTM process will be modeled.

This research is supervised by Guy Van Assche and is funded by FWO.

Publications

This project has no publications.