A rheological characterization of SBS block copolymers

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Abstract
The dynamic viscosities of styrene–butadiene–styrene (SBS) block copolymer melts with different end‐ and midblock sizes are given as a function of frequency at several different temperatures. The data exhibit two distinct regions, a high frequency region where the response is typical of thermoplastics and a low frequency region where the viscosity continually increases with decreasing deformation rates. These results are successfully explained in terms of the formation of polystyrene domains in the low frequency region. The correlations given for the rheological properties should provide additional insight to the processing of these materials.

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