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6629771 
Journal Article 
SYNTHESIS AND ULTRASTRUCTURAL STUDIES OF STYRENE DIVINYLBENZENE POLYHIPE POLYMERS 
Hainey, P; Huxham, IM; Rowatt, B; Sherrington, DC; Tetley, L; , 
1991 
1 
Macromolecules
ISSN: 0024-9297
EISSN: 1520-5835 
AMER CHEMICAL SOC 
WASHINGTON 
24 
1 
117-121 
English 
WOS:A1991ER45200019 
A range of Polyhipe polymers have been prepared by polymerization of the styrene-divinylbenzene continuous oil phase of a number of high internal phase emulsions (HIPE). The aqueous internal, or discontinuous, phase constituted-approximately-90% by volume in each case and was in the form of small droplets-approximately-10-mu-m in diameter. Complete removal of each aqueous phase was achieved after polymerization by exhaustive extraction with hot ethanol, leaving monolithic Polyhipe polymers with completely interconnected cellular structures of overall very low bulk density. By adjustment of the level of cross-linker (divinylbenzene) and by use of either a precipitating porogen, petroleum ether, or a solvating porogen, toluene, in the comonomer oil phase, a secondary pore structure has been generated within the cell "walls" of the Polyhipe polymers. Overall surface areas deduced from a BET treatment of N2 sorption data of between 3 and 350 m2 g-1 have been achieved. Scanning (800X and 6400X) and transmission (7000X and 50 000X) electron micrographs have confirmed the cellular structure of the Polyhipe polymers, and the porous structure of their walls. Superfically the observed porosity correlates positively with the measured surface areas.