The Preparation of Pore-Size Controlled Mesoporous Silicas by Biodegradable Diblock Copolymers

Jeong Ho Chang; Kyung Ja Kim; Young Kook Shin

doi:10.4028/www.scientific.net/KEM.287.141

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The Structure Effect of Polymeric Dispersant on Rheological Behavior of Highly Concentrated Silicon Nitride Gelcasting Slip
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The Preparation of Pore-Size Controlled Mesoporous Silicas by Biodegradable Diblock Copolymers
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SPS Processing and Superplastic Deformation of Silicon Nitride Based Ceramics
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Effect of Aluminium on High-Energy Ball Milling and Spark Plasma Sintering of Silicon Nitride
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HomeKey Engineering MaterialsKey Engineering Materials Vol. 287The Preparation of Pore-Size Controlled Mesoporous...

The Preparation of Pore-Size Controlled Mesoporous Silicas by Biodegradable Diblock Copolymers

Abstract:

Selected MPEG-b-PDLLA block copolymers have been synthesized by ring-opening polymerization with systematic variation of the chain lengths of the resident hydrophilic and hydrophobic blocks. The size and shape of the micelles that spontaneously form in solution are then controlled by the characteristics of the block copolymer template. All the materials prepared in this study showed the tunable pore size of 20-80Å with the increase of hydrophobic chain lengths and up to 660m2/g of specific surface area. The formation mechanism of these nanoporous structures obtained by controlling the micelle size has been confirmed using both liquid and solid state 13C and 29Si NMR techniques. This work verifies the formation mechanism of nanoporous structures in which the pore size and wall thickness are closely dependent on the size of hydrophobic cores and hydrophilic shells of the block copolymer templates.

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Periodical:

Key Engineering Materials (Volume 287)

Pages:

141-145

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.287.141

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Online since:

June 2005

Authors:

Jeong Ho Chang, Kyung Ja Kim, Young Kook Shin

Keywords:

Block-Copolymer, Micelle, Nanocomposite, Polymer, Ring-Opening Polymerization, Self-Assembly, Solid-State Structures, Template

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