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Continuous preparation of porous organofunctionalized (Hetero‐)polysiloxane spheres
Author(s) -
Witossek Herbert,
Bratz Ernst
Publication year - 1997
Publication title -
chemical engineering and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.403
H-Index - 81
eISSN - 1521-4125
pISSN - 0930-7516
DOI - 10.1002/ceat.270200612
Subject(s) - coalescence (physics) , porosity , materials science , spheres , chemical engineering , residence time distribution , aqueous solution , alkoxy group , porous medium , particle (ecology) , particle size distribution , particle size , chemistry , composite material , mineralogy , organic chemistry , inclusion (mineral) , physics , alkyl , oceanography , astronomy , astrobiology , engineering , geology
Abstract When in contact with water, organoalkoxysilanes and other alkoxy metal compounds react to organofunctionalized polysiloxanes or heteropolysiloxanes. A new method for the continuous preparation of porous organopolysiloxane spheres was developed. Droplets of the precursor mixture are injected into the vertical reactor column. Movement of the gelating droplets is controlled by flow of the aqueous reaction medium. Advantages are adjustable residence time, minimized coalescence and low reactor height. An example shows typical product characteristics like narrow particle size distribution and macroporosity.