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This work investigates the influence of post mould cure (PMC) duration on the viscoelastic properties of a low stress, epoxy mould compound. Results show glass transition increases while modulus measured at room temperature decreases with increasing PMC duration. Glass transition typically increases with increasing PMC as cross-linking density increases. Modulus is not expected to decrease with increased cross-link density. It is postulated that progressive attachment of silicone particles to the cross-link network of the encapsulant is active during PMC. The net effect of the attachment of silicone particles to the cross-linked network and increased cross-link density as a result of residual cure is a decrease in modulus with increasing post mould cure.
Electronics Packaging Manufacturing, IEEE Transactions on (Volume:26 , Issue: 3 )
Date of Publication: July 2003