Citation: . SYNTHESIS OF HYBRID MESOPOROUS POLYSTYRENE-SILICA MATERIALS WITH NON-SURFACTANT CITRIC ACID AS TEMPLATE VIA SOL-GEL PROCESS*[J]. Chinese Journal of Polymer Science, ;2002, 20(6): 565-572. shu

SYNTHESIS OF HYBRID MESOPOROUS POLYSTYRENE-SILICA MATERIALS WITH NON-SURFACTANT CITRIC ACID AS TEMPLATE VIA SOL-GEL PROCESS*

Received Date: 22 January 2002
Revised Date: 25 March 2002

Hybrid mesoporous polystyrene-silica materials were successfully prepared through HCl-catalyzed sol-gelreactions of tetraethyl orthosilicate (TEOS) and triethoxysilyl-functionalized polystyrene obtained via atom transfer radicalpolymerization (ATRP) of styrene, in the presence of citric acid (CA) as non-surfactant template or pore-forming agent andfollowed by ethanol extraction to remove template molecules. The materials were characterized by infrared spectroscopy (IR), N2 adsorption-desorption measurements,powder X-ray diffraction (XRD), thermogravimetric analysis (TGA) and transmission electron microscopy (TEM).The results indicate that the materials prepared with 50 wt%-60 wt% template contents have average pore sized of 2-3 nm and large surface areas(ca.886 m2/g) as well as high pore volumes (ca.0.53 cm3/g) The mesoporosity arises from interconnected channels and pores with disordered arrangements.The pore diameters and pore volumes increase as the template content is increased.The pore diameters show a little change upon heating at 200℃ overnight.However,the materials do not have good hydrothermal stability.
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