Rheological Behavior of the Full Adhesive Formulations

The pure diblock-triblock blends previously described cannot develop sufficient tack onto surfaces, in particular because the modulus level in the terminal zone is too high (Dahlquist criterion [3]). In order to improve tack properties, tackify-ing resins are added to the copolymer blend. They have in fact two important effects [4, 5]  

These two effects bring aggressive tack properties to the copolymer base. One can see an example for a classical full adhesive formulation in Fig. 16.3. The different relaxation domains previously described are the same. It is important to notice that, in the terminal region, as for the pure blend, a low secondary pla- 

In Section 16.4, we will particularly discuss the variations of the secondary plateau as a function of the diblock content in the blend [SIS-SI] and in the full adhesive formulation. The secondary plateau value is really a key parameter for optimizing the rheological behavior of the final adhesives. 

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