Abstract
Effect of ethanol as diluent in the preparation of nano-sized boron nitride filler filled epoxy composites was investigated. Ethanol at 10 wt% was used to reduce the viscosity of epoxy composites. Filler loading up to 6 vol% is able to be added in the diluent system, as compared to 4 vol% in the non-diluent system. Sonication process was used to facilitate filler dispersion. At 4 vol% filler loadings, diluent system showed 36 % higher in flow rates than non-diluent system. Apparently, non-diluent system showed higher flexural strength, modulus, thermal conductivity, and lower coefficient of thermal expansion (CTE) than that of diluent system. However, when the filler loading is up to 6 vol% for the diluent system, CTE is reduced 4.3 % and thermal conductivity increased 6.9 % if compared to 4 vol% non-diluent system. In general, it is concluded that diluent system at 6 vol% exhibit better flowability, CTE and thermal conductivity to fabricate underfill materials.
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