Phase Behavior in Asymmetrical Ternary Blends of Polyolefins

Alisyn Nedoma (U California-Berkeley)

Ternary polymer blends of the A/B/A-C type comprise two immiscible homopolymers, A and B, along with a diblock surfactant, A-C. The interspecies interactions, as characterized by the Flory-Huggins . parameter, are tuned to enable access to thermodynamic microphases such as lamellae and microemulsions. Asymmetry is introduced as a disparity in the chain lengths of the A and B homopolymers, enabling independent control over the volume fraction of a species and it.s entanglement with the surfactant. The resulting phase behavior is discussed in terms of the diblock phase diagram, wet and dry brush regimes, and within the context of the random phase approximation.

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