Abstract
We report the first application of dynamic interfacial tension measurements to characterize segregation rates of diblock copolymers to a polymer−polymer interface. The system investigated is a poly(styrene-b-dimethylsiloxane) [P(S-b-DMS); Mn = 13 000] symmetric diblock copolymer added to a molten blend of the corresponding immiscible homopolymers. Interfacial tensions are measured by the pendant drop technique with poly(styrene) [PS; Mn = 4000] as the pendant drop phase and a mixture of poly(dimethylsiloxane) [PDMS; Mn = 1600] with silane-terminated P(S-b-DMS) as the surrounding phase. The pendant drop technique is found to suffer from two intrinsic limitations in this application: short time data are inaccessible due to the finite time required for the drop shape to equilibrate, and long time data may not be readily analyzed as a result of the finite drop size. Intermediate time data are compared to the predictions of diffusion-limited segregation models proposed by Budkowski, Losch, and Klein (BLK) and...
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