Networks of helix-forming polymers

Details Networks of helix-forming polymers Networks of helix-forming polymers

2002-07-05

arxiv.org/abs/cond-mat/0207162v2

Eur. Phy. J E 8 539 (2002)

Physics

Condensed Matter

Soft Condensed Matter

Latex, 17 pages, 11 figures, final version

Scientific paper

10.1140/epje/i2002-10044-x

Biological molecules can form hydrogen bonds between nearby residues, leading to helical secondary structures. The associated reduction of configurational entropy leads to a temperature dependence of this effect: the "helix-coil transition". Since the formation of helices implies a dramatic shortening of the polymer dimensions, an externally imposed end-to-end distance R affects the equilibrium helical fraction of the polymer and the resulting force- extension curves show anomalous plateau regimes. In this article, we investigate the behaviour of a cross-linked network of such helicogenic molecules, particularly, focusing on the coupling of the (average) helical content present in a network to the externally imposed strain. We show that both an elongation and compression can lead to an increase in helical domains under appropriate conditions.

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