Self-lubricating nano-ball-bearings

被引：27

作者：

Brick, Chad M.

Chan, Elaine R.

Glotzer, Sharon C.

Marchal, Julien C.

Martin, David C.

Laine, Richard M. ^{[1
]}

机构：

[1] Univ Michigan, Dept Mat Sci & Engn, Ann Arbor, MI 48109 USA

[2] Univ Michigan, Macromol Sci & Engn Ctr, Ann Arbor, MI 48109 USA

[3] Univ Michigan, Dept Chem Engn, Ann Arbor, MI 48109 USA

[4] Dow Corning Corp, Corp Ctr, Midland, MI 48686 USA

来源：

ADVANCED MATERIALS | 2007年 / 19卷 / 01期

关键词：

D O I：

10.1002/adma.200601551

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Friedel-Crafts alkylation of octaphenyl-octasilsesquioxane (OPS) introduces a hydrocarbon layer around the rigid OPS core (see figure). Although periodic order is maintained even in the melt, as determined from X-ray diffraction measurements, this layer provides access to low-melting solids for butyl, hexyl, octyl, and decyl substituents. Because the alkyl groups interdigitate, the butyl and hexyl melts are stable to temperatures of ca. 400 degrees C, which is ca. 100 degrees C higher than the octyl and decyl compounds.

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页码：82 / +

页数：6

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