Rheology of silicon carbide/vinyl ester nanocomposites

被引：0
|
作者：
Yong, Virginia [1 ]
Hahn, H. Thomas [1 ,2 ]
机构：
[1] Materials Science and Engineering Department, University of California, Los Angeles, CA 90095
[2] Mechanical and Aerospace Engineering Department, University of California, Los Angeles, CA 90095
来源：
Journal of Applied Polymer Science | 2006年 / 102卷 / 05期
关键词：
Silicon carbide (SiC) nanoparticles with no surface treatment raise the viscosity of a vinyl ester resin much more intensely than micrometer-size SiC particles. An effective dispersant generally causes a reduction in the resin viscosity attributed to its surface-active properties and thereby increases the maximum fraction of particles that can be introduced. This article assesses the Theological behavior of SiC-nanoparticle-filled vinyl ester resin systems with the Bingham; power-law; Herschel-Bulkley; and Casson models. The maximum particle loading corresponding to infinite viscosity has been determined to be a 0.1 volume fraction with the (1 - ηr-1/2)-φ dependence (where ηr is the relative viscosity and φ is the particle volume frac tion). The optimum fractional weight percentage of the dispersants (wt % dispersant/wt % SiC) is around 40% for 30-nm SiC nanoparticles; which is much higher than 1-3% for micrometer-size particles. SiC nanoparticles at a concentration of 9.2 wt % (0.03 volume fraction) cause a fourfold increase in the resin viscosity. The addition of a dispersant at the optimum dosage lowers the viscosity of SiC/vinyl ester suspensions by 50%. The reduction in the viscosity is substantial to improve the processability of SiC/vinyl ester nanocomposites. © 2006 Wiley Periodicals; Inc;
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页码：4365 / 4371
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