Polymerization processes in simulated free space conditions

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Polymerization processes in simulated free space conditions

Kondyurin, A. / Lauke, B.

The creation of large-size space constructions by the way of deployment structures needs a rigidization of shell material after unfolding. The best way for rigidization is chemical reaction. But there is a negative influence of space factors on a liquid polymer matrix and on the polymerisation process. We suggest that the free space factors can initiate the polymerisation reaction, for example a curing reaction of epoxy resin composition. This paper contains the results of experiments on polymerization processes under action of separate free space factors: vacuum and plasma action. For the simulation of space plasma a discharge of microwave plasma and radio-frequency plasma were used. Structures of polymer materials cured under plasma and in usual curing conditions were compared. The results on degradation processes in liquid epoxy resin under plasma action were taken into account at the curing kinetic study. The formation of new active groups in liquid composition under plasma action and the ability of new groups to take part in curing reaction was analysed. The process of layers mixing in liquid epoxy resin during plasma action was observed. The mixing of oxidised layers with initial bulk layers of resin leads to an acceleration of the curing reaction. Due to layers mixing the plasma treatment becomes a method for bulk modification of polymers. The way of utilisation of negative free space factors for the curing process of composite materials in free space is proposed. In comparison with plasma discharge the space plasma can be used for polymerisation process of a composite materials on Earth orbit.