Hierarchical Porous Polystyrene Monoliths from PolyHIPE.
Macromol Rapid Commun
; 36(17): 1553-8, 2015 Sep.
Article
em En
| MEDLINE
| ID: mdl-26178423
ABSTRACT
Hierarchical porous polystyrene monoliths (HCP-PolyHIPE) are obtained by hypercrosslinking poly(styrene-divinylbenzene) monoliths prepared by polymerization of high internal phase emulsions (PolyHIPEs). The hypercrosslinking is achieved using an approach known as knitting which employs formaldehyde dimethyl acetal (FDA) as an external crosslinker. Scanning electron microscopy (SEM) confirms that the macroporous structure in the original monolith is retained during the knitting process. By increasing the amount of divinylbenzene (DVB) in PolyHIPE, the BET surface area and pore volume of the HCP-PolyHIPE decrease, while the micropore size increases. BET surface areas of 196-595 m(2) g(-1) are obtained. The presence of micropores, mesopores, and macropores is confirmed from the pore size distribution. With a hierarchical porous structure, the monoliths reveal comparable gas sorption properties and potential applications in oil spill clean-up.
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MEDLINE
Assunto principal:
Poliestirenos
Idioma:
En
Ano de publicação:
2015
Tipo de documento:
Article