present teaching to precisely control temperature of separate zones within a capillary was exploited to optimise and better understand the fabrication of porous polymer monoliths within capillary columns in this experiment the tec array module was used to polymerise a monolithic column with a longitudinal density gradient to achieve this a capillary filled with buma edma polymerisation mixture was attached to the tec units and a heating profile from 60 u00b0 c to 54 u00b0 c programmed over six distinct thermal zones with 1 u00b0 c spatial increments polymerisation of the complete monolith was performed for 16 hours after which the monolith was washed with meoh for 1 hour cut into segments corresponding to each temperature zone and dried the porous structure of each of these segments was characterised using sem fig9 shows sem images of two selected zones of the monolith polymerised at a 60 u00b0 c and b 54 u00b0 c it can be clearly seen that the size of polymer globules and flow through pores differ for these sections from each of the six sets of segments the average size n 30 of the pores were determined and plotted against the exact polymerisation temperature this relationship is presented as fig1.