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Ia3d cubic mesoporous silicas using EO17MA23 diblock copolymers made from ATRP
Yi-Tsu Chan1, Hong-Ping Lin, Chung-Yuan Mou
1Department of Chemistry, National Taiwan University, Taipei 106, Taiwan.
Chemical Communications (Cambridge, England)
|December 14, 2002
Summary
This study demonstrates the synthesis of Ia3d mesoporous silica with thick walls using a poly(ethylene oxide)-b-poly(methyl acrylate) diblock copolymer template prepared by atom transfer radical polymerization under acidic conditions.
Area of Science:
- Materials Science
- Polymer Chemistry
- Nanotechnology
Background:
- Mesoporous silica materials exhibit unique properties for various applications.
- Block copolymers are effective structure-directing agents in silica synthesis.
- Atom transfer radical polymerization (ATRP) offers controlled synthesis of block copolymers.
Purpose of the Study:
- To synthesize Ia3d mesostructured silica with thick walls.
- To utilize a poly(ethylene oxide)-b-poly(methyl acrylate) diblock copolymer as a template.
- To investigate the effect of acidic conditions on silica templating.
Main Methods:
- Synthesis of poly(ethylene oxide)-b-poly(methyl acrylate) diblock copolymer via ATRP.
- Sol-gel process for silica formation using the block copolymer as a template.
- Acidic hydrolysis and condensation conditions were employed.
Main Results:
- Successfully synthesized Ia3d mesostructured silica.
- The resulting silica exhibited thick walls, attributed to the diblock copolymer structure.
- The acidic conditions facilitated the formation of the desired mesostructure.
Conclusions:
- Poly(ethylene oxide)-b-poly(methyl acrylate) is an effective template for Ia3d mesoporous silica.
- ATRP provides a controlled route to the template polymer.
- Thick-walled Ia3d silica can be achieved under acidic templating conditions.