PREPARATION OF A NONAQUEOUS DISPERSION OF STERICALLY STABILIZED BOEHMITE RODS

被引：55
|
作者：
BUINING, PA
VELDHUIZEN, YSJ
PATHMAMANOHARAN, C
LEKKERKERKER, HNW
机构：
[1] Van't Hoff laboratory for physical and colloid chemistry, university of Utrecht, 3584 CH Utrecht
来源：
COLLOIDS AND SURFACES | 1992年 / 64卷 / 01期
关键词：
BOEHMITE; COLLOIDAL RODS; MODIFIED POLY(ISOBUTENE); ORGANIC COATING; STERIC STABILIZATION; STREAMING BIREFRINGENCE;
D O I：
10.1016/0166-6622(92)80161-T
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
A poly(isobutene) grafting procedure is described which leads to sterically stabilized dispersions of (fairly monodisperse) boehmite needles in toluene and cyclohexane. The procedure employs a gradual change in solvent composition, transferring the boehmite from water to the organic solvent without loss of colloidal stability. The presence of firmly attached (modified) poly(isobutene) on the boehmite needles is clearly established with various techniques, such as infra-red spectroscopy and elemental analysis, as well as flocculation tests. The change from electrostatically stabilized needles in water to grafted needles in cyclohexane is manifested by a marked reduction in viscosity, and a decrease in the relaxation time of streaming birefringence.
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页码：47 / 55
页数：9
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