Hierarchical assembly of nanostructured organosilicate networks via stereocomplexation of block copolymers

被引：43

作者：

Kim, Sung Ho ^{[1
]}

Nederberg, Fredrik ^{[1
,2
]}

Zhang, Lei ^{[1
]}

Wade, Charles G. ^{[1
]}

Waymouth, Robert M. ^{[2
]}

Hedrick, James L. ^{[1
]}

机构：

[1] IBM Res Corp, Almaden Res Ctr, San Jose, CA 95120 USA

[2] Stanford Univ, Dept Chem, Stanford, CA 94305 USA

来源：

NANO LETTERS | 2008年 / 8卷 / 01期

关键词：

D O I：

10.1021/nl0726813

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The effect of the stereochemistry of polylactide (PLA)-based block copolymers on templated inorganic nanostructures has been investigated from the self-assembly of a stereoisomer pair/organosilicate mixture followed by organosilicate vitrification and copolymer thermolysis. Isomeric PLA homopolymers, block copolymers, and a stereoblock copolymer were prepared by ring-opening polymerization Of D-, L-, or rac-lactide using an organocatalytic catalyst. Both differential scanning calorimetry and atomic force microscopy showed the formation of a stereocomplex between enantiomeric stereoisomers, that is, block copolymer/block copolymer and block copolymer/homopolymer mixtures as well as a stereoblock copolymer. The unique noncovalent interactions driven by stereocomplexation of D- and L-lactide provided supramolecular structures with a hierarchical order as characterized by distinctive vertical and horizontal growth of toroidal nanostructured inorganic features. This study demonstrates the potential of hierarchically assembling suprastructures that bridge the nano- to mesoscale feature sizes in the design of tunable functional nanomaterials suitable for future applications of microelectronics, material science, and bioengineering.

引用

页码：294 / 301

页数：8

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