The main objective concerns the optimization and prediction of cellular structures in elastomeric materials for vehicle sealing parts. This allows producing lighter parts (CO2 reduction) with a good acoustic and mechanical behavior.
The rubber formulation contains a chemical foaming agent. When the mixture is injected, the heat supplied by the mold activates the gas production reaction, but also the vulcanization. The challenge is to control the process so that the mold is filled and the gas released before vulcanization. The objective is to understand the main mechanisms governing the foaming process in order to better control the cells size and the dimensions of the part after opening of the mold.
The relationship between the microstructure and the various parameters of the process has to be established. Experiments will be performed on an instrumented mold. X-ray micro-tomography and image analysis will be used to characterize the microstructure of the foams. Dedicated experiments will be designed in order to better understand the different physico-chemical phenomena.

Publié le 02/08/2019