A method of iterative polymer synthesis comprising the following steps 1) to 11): 1) Providing a plurality of movable, closable storage vessels, which are shaped so as to enable transport by an automated means and each comprise a first transfer port suitable for the transfer of solid material, wherein each of the storage vessels contains a defined amount of a building block B in solid form to be used in one cycle of the iterative polymer synthesis process; 2) Using an automated transport means to transfer a specific storage vessel selected from said plurality of y storage vessels to a first reaction vessel RV1, which comprises a second transfer port suitable for the transfer of solid material, wherein: • said first transfer port of each storage vessel is constructed and arranged such that it can be releasably docked to said second transfer port of the first reaction vessel RV1, thereby forming a connection between both vessels; and • material can pass though said transfer ports (26, 27) when in connected state, but not in disconnected state; 3) Aligning and docking the first transfer port on said storage vessel to the second port on said first reaction vessel RV1; 4) Opening said docked transfer ports (26, 27) and transferring the building block B from said storage vessel into said first reaction vessel RV1; 5) Dissolving said building block B by addition of a suitable solvent, thereby forming a solution of the building block B inside the first reaction vessel RV1; 6) Transfering the solution obtained in step 5), to a second reaction vessel RV2 containing a carrier, to which a molecule C is tethered, thereby obtaining a reaction mixture containing the building block B and the carrier with the molecule C; 7) Cleaning the first reaction vessel RV1, including the transfer port, by rinsing with solvent, which may be the same as or different from the solvent used in step 5); 8) Incubating the reaction mixture obtained in step 6) under conditions, which allow for the formation of a chemical bond between the building block B and the molecule C so as to form a molecule C', which is extended by one building block unit; 9) Retaining the carrier with the extended molecule C' inside the second reaction vessel RV2, while purging a liquid comprising by-products and residual educts of the coupling reaction from the second reaction vessel RV2; 10) Conditioning the carrier with the extended molecule C' for the next synthetic cycle with the extended molecule C' as molecule C; and 11) Undocking and removing the empty storage vessel from said first reaction vessel RV1 using the automated transport means; wherein at least the steps 2) to 11) are carried out at least once in automated fashion. 1) Providing a plurality of movable, closable storage vessels, which are shaped so as to enable transport by an automated means and each comprise a first transfer port suitable for the transfer of solid material, wherein each of the storage vessels contains a defined amount of a building block B in solid form to be used in one cycle of the iterative polymer synthesis process; 2) Using an automated transport means to transfer a specific storage vessel selected from said plurality of y storage vessels to a first reaction vessel RV1, which comprises a second transfer port suitable for the transfer of solid material, wherein: • said first transfer port of each storage vessel is constructed and arranged such that it can be releasably docked to said second transfer port of the first reaction vessel RV1, thereby forming a connection between both vessels; and • material can pass though said transfer ports (26, 27) when in connected state, but not in disconnected state; • said first transfer port of each storage vessel is constructed and arranged such that it can be releasably docked to said second transfer port of the first reaction vessel RV1, thereby forming a connection between both vessels; and • material can pass though said transfer ports (26, 27) when in connected state, but not in disconnected state; 3) Aligning and docking the first transfer port on said storage vessel to the second port on said first reaction vessel RV1; 4) Opening said docked transfer ports (26, 27) and transferring the building block B from said storage vessel into said first reaction vessel RV1; 5) Dissolving said building block B by addition of a suitable solvent, thereby forming a solution of the building block B inside the first reaction vessel RV1; 6) Transfering the solution obtained in step 5), to a second reaction vessel RV2 containing a carrier, to which a molecule C is tethered, thereby obtaining a reaction mixture containing the building block B and the carrier with the molecule C; 7) Cleaning the first reaction vessel RV1, including the transfer port, by rinsing with solvent, which may be the same as or different from the solvent used in step 5); 8) Incubating the reaction mixture obtained in step 6) under conditions, which allow for the formation of a chemical bond between the building block B and the molecule C so as to form a molecule C', which is extended by one building block unit; 9) Retaining the carrier with the extended molecule C' inside the second reaction vessel RV2, while purging a liquid comprising by-products and residual educts of the coupling reaction from the second reaction vessel RV2; 10) Conditioning the carrier with the extended molecule C' for the next synthetic cycle with the extended molecule C' as molecule C; and 11) Undocking and removing the empty storage vessel from said first reaction vessel RV1 using the automated transport means;