Abstract
We studied the affect of molecular weight on the adhesion properties of reactive hot melt adhesive (RHA), which has polyurethane prepolymer as its major component. The RHAs that were prepared by the two-shot method and were of a higher average molecular weight showed improved initial bond strength development compared to that of RHAs prepared by the one shot method but with the same recipe. However, the viscosity of the RHA was increased by this method, which reduced the cross-linking in the cured RHA. This was confirmed by its deteriorated tensile properties and increased tan δ value. The reactive organoclay, Cloisite 30B, also improved the initial bond strength development and raised the viscosity of the RHA, thereby reducing cross-linking in the cured RHA.
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