Arrested swelling of highly entangled polymer globules.
Upon aging, a collapsed long chain evolves from a crumpled state to a self-entangled globule which can be thought of as a large knot. Swelling of an equilibrium globule in good solvent is a two-step process: (i) fast swelling into an arrested stretched structure with conserved entanglement topology followed by (ii) slow disentanglement. Using computer simulation, we found both mass-mass (m-m) and entanglement-entanglement (e-e) power law correlations inside the swollen globule. The m-m correlations are characterized by a set of two exponents in agreement with a Flory-type argument. The e-e correlations are also characterized by two exponents, both of them larger (by approximately 0.3) than the related m-m exponents. We interpret this difference as evidence of distance-dependent repulsion E=-0.3ln((rho)k(B)T between entanglements sliding along the polymer chain.
Lee
Nam-Kyung
NK
Laboratoire Européen Associé ICS Strasbourg, France)/MPIP(Mainz, Germany).
Abrams
Cameron F
CF
Johner
A
A
Obukhov
S
S
D008956:Models, Chemical; D008968:Molecular Conformation; D011108:Polymers / Q000737:chemistry*; D017510:Protein Folding
D011108:Polymers