A technique is described for the preparation of polymers according to a process in which the starting compound of formula is polymerized in the presence of a base in an organic solvent. The reaction carrier includes flow channels and a coding that is detectable by a position sensor to position the reaction carrier flow channels. The cart further comprises a top shell hinged to the bottom shell such that the top shell can be closed over the bottom shell thereby forming the clamshell case; the top shell to close over the bottom shell only when the container is collapsed. The second component may also contain at least one gelling agent, and the composition maybe present as a foam or is foamable.