Abstract
We discuss compositional fluctuations in densely end-grafted polymers when two species of chains are present. When the two species are identical except for labeling, we relate the two-point spatial correlation function of local composition to density-density correlations within a single chain and calculate it under melt and solvent-swollen conditions. We deduce structure factors that could be observed in scattering from a layer composed of two chain species that differ only in their coupling to the scatterers. We generalize these results to describe compositional fluctuations when the two species have a nonzero free energy of mixing. These fluctuations diverge at a critical molecular weight. We analyze the divergence to corroborate the recently predicted phase transition to a “rippled” phase.
Original language | English (US) |
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Pages (from-to) | 296-307 |
Number of pages | 12 |
Journal | Macromolecules |
Volume | 25 |
Issue number | 1 |
DOIs | |
State | Published - Jan 1 1992 |
ASJC Scopus subject areas
- Organic Chemistry
- Polymers and Plastics
- Inorganic Chemistry
- Materials Chemistry