Abstract
The effect of copolymer composition on their dynamics in a homopolymer matrix has been studied using specular neutron reflectivity (NR). We have monitored the segregation process of random copolymers, containing styrene (S) and methyl methacrylate (MMA), to the d-PS/d-PMMA interface from a polymer matrix. Four random copolymers containing 50, 54, 67, and 80% MMA were studied at 10 wt % loading in d-PMMA, where the interfacial excess, Z*, growth scaled as t1/2 as predicted by theory. These results are correlated to the diffusion-limited growth of a copolymer wetting layer at the d-PS/d-PMMA interface. The mutual and tracer diffusion coefficients and the effective friction coefficients for these copolymers were then determined. The results demonstrate that the copolymer composition has a significant impact on its dynamics. Copolymer dynamics are significantly faster than those for a diblock copolymer at the same composition, which indicates that the impact of the change in composition is more than that due ...
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