AI Article Synopsis
- The melt film of low molecular weight cyclic polystyrene (CPS) shows confinement effects at a thickness much greater than that of its linear chain counterpart.
- Although the linear chain polymer doesn't exhibit confinement effects even at a thickness of 7, cyclic films display these effects at thicknesses as large as 14.
- A thicker adsorbed layer at the substrate for cyclic chains (70% thicker than linear) contributes to slowed surface fluctuations, indicating significant differences in how the two chain types interact at the interface.
Article Abstract
The surface fluctuations of a melt film of a low molecular weight cyclic polystyrene (CPS) manifest confinement effects for a film thickness (14) much larger than that for which a melt film of the linear chain analog manifests confinement. This is true both in terms of absolute thickness and thickness relative to chain size, . In fact, the linear analog polymer does not manifest confinement effects even at a thickness of 7. Both types of films have a strongly adsorbed layer at the substrate that plays a role in slowing the surface fluctuations for the thinnest films. This layer is 70% thicker for the cyclic chains than for the linear chains. At the interface with the substrate the packing of the cyclic chains is perturbed much more strongly than is the packing of the linear chains.
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| http://dx.doi.org/10.1021/acsmacrolett.6b00497 | DOI Listing |
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