Mechanisms of Chain Diffusion in Lamellar Block Copolymers
- 24 July 1995
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 75 (4), 657-660
- https://doi.org/10.1103/PhysRevLett.75.657
Abstract
We report measurements of chain diffusion in macroscopically oriented, well-entangled lamellar block copolymers. Diffusion in the lamellar plane is proposed to occur by an “activated reptation” mechanism when the composition profile is roughly sinusoidal. At higher degrees of segregation a crossover to an entropically limited “block retraction” mechanism is apparent. Diffusion through the layers reflects a thermodynamic barrier determined by the combination of temperature and molecular weight.Keywords
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