Self-similar chain conformations in polymer gels

Details Self-similar chain conformations in polymer gels Self-similar chain conformations in polymer gels

1999-09-30

arxiv.org/abs/cond-mat/9909453v1

Physics

Condensed Matter

Soft Condensed Matter

4 pages, RevTex, 3 Figures

Scientific paper

10.1103/PhysRevLett.84.298

We use molecular dynamics simulations to study the swelling of randomly end-cross-linked polymer networks in good solvent conditions. We find that the equilibrium degree of swelling saturates at Q_eq = N_e**(3/5) for mean strand lengths N_s exceeding the melt entanglement length N_e. The internal structure of the network strands in the swollen state is characterized by a new exponent nu=0.72. Our findings are in contradiction to de Gennes' c*-theorem, which predicts Q_eq proportional N_s**(4/5) and nu=0.588. We present a simple Flory argument for a self-similar structure of mutually interpenetrating network strands, which yields nu=7/10 and otherwise recovers the classical Flory-Rehner theory. In particular, Q_eq = N_e**(3/5), if N_e is used as effective strand length.

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