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The diffusion (Dₛ) of entangled and unentangled symmetric block copolymers is compared, above and below the ordering transition. The lamellar samples were not macroscopically oriented, and thus Dₛ reflects a combination of mobilities parallel and perpendicular to the lamellar planes. For unentangled (Rouse) chains, Dₛ is unaffected by the microstructure, whereas entangled (reptating) chains are retarded significantly; this difference reflects an interesting combination of thermodynamic and entanglement constraints. Furthermore, this retardation persists into the nominally disordered state.
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Dalvi et al. (1993) studied this question.
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