Abstract
The effect of dispersants on particle dispersion and flexural properties of SiC/vinyl esternanocomposites was studied by factorial and response surface designs. The results showthat the coupling agent ‘gamma-methacryloxy propyl trimethoxy silane (MPS)’ has noadverse side effect on the flexural properties as illustrated by the good correlation betweenmaximizing the flexural strength and minimizing the agglomerates. However, the dispersant‘BYK-W 966’ has a slight adverse side effect on the flexural properties although it improvesdispersion at higher dosage. With an optimal dosage of MPS and W966, a smallamount of SiC in 0.5 wt% results in 8% increase in strength and 14% increase inmodulus. The flushing operation using the dispersant ‘1-octanol/decane’ achieves anexcellent SiC dispersion but it does not result in improved flexural properties.This confirmed that a better state of nanoparticle dispersion does not necessarilylead to improved flexural properties. A good dispersion coupling with a strongfiller/matrix interfacial bonding is the key to obtain enhanced flexural properties.
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