What Happens When Threading is Suppressed in Blends of Ring and Linear Polymers?
Department of Scientific Computing, Florida State University, Tallahassee, FL 32306, USA
Author to whom correspondence should be addressed.
Academic Editor: Martin Kröger
Received: 27 October 2016 / Revised: 15 November 2016 / Accepted: 18 November 2016 / Published: 25 November 2016
Self-diffusivity of a large tracer ring polymer,
, immersed in a matrix of linear polymers with
monomers each shows unusual length dependence.
initially increases, and then decreases with increasing
. To understand the relationship between the nonmonotonic variation in
and threading by matrix chains, we perform equilibrium Monte Carlo simulations of ring-linear blends in which the uncrossability of ring and linear polymer contours is switched on (non-crossing), or artificially turned off (crossing). The
obtained from the crossing simulations, provides an upper bound for the
obtained for the regular, non-crossing simulations. The center-of-mass mean-squared displacement (
) curves for the crossing simulations are consistent with the Rouse model; we find
. Analysis of the polymer structure indicates that the smaller matrix chains are able to infiltrate the space occupied by the ring probe more effectively, which is dynamically manifested as a larger frictional drag per ring monomer.
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Crysup, B.; Shanbhag, S. What Happens When Threading is Suppressed in Blends of Ring and Linear Polymers? Polymers 2016, 8, 409.
Crysup B, Shanbhag S. What Happens When Threading is Suppressed in Blends of Ring and Linear Polymers? Polymers. 2016; 8(12):409.
Crysup, Benjamin; Shanbhag, Sachin. 2016. "What Happens When Threading is Suppressed in Blends of Ring and Linear Polymers?" Polymers 8, no. 12: 409.
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