Sims chain 171 -energy

In fact, H. Brown was led to this type of formula by a series of systematic experiments on the toughness of an AB interface with A = p. styrene B = p. methyl metacrylate d ) (20), Here, die cohesion between the two is established via block copolymers AB lying at the surface (fig. 5). In a number of cases the blocks ruptured very near their junction point (as shown by SIMS). It was found that the energy Qo was proportionnal to the square of the number n of bridging chains per unit area this fits with eq. (14) since, in the present case, Oy is due to the copolymers only, and is thus proportional to n. 

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