Phase diagram and the pseudogap state in a linear chiral homopolymer model
2015 (English)In: Physical Review E. Statistical, Nonlinear, and Soft Matter Physics, ISSN 1539-3755, E-ISSN 1550-2376, Vol. 92, no 3, 032602Article in journal (Refereed) Published
The phase structure of a single self-interacting homopolymer chain is investigated in terms of a universal theoretical model, designed to describe the chain in the infrared limit of slow spatial variations. The effects of chirality are studied and compared with the influence of a short-range attractive interaction between monomers, at various ambient temperature values. In the high-temperature limit the homopolymer chain is in the self-avoiding random walk phase. At very low temperatures two different phases are possible: When short-range attractive interactions dominate over chirality, the chain collapses into a space-filling conformation. But when the attractive interactions weaken, there is a low-temperature unfolding transition and the chain becomes like a straight rod. Between the high- and low-temperature limits, several intermediate states are observed, including the theta regime and pseudogap state, which is a novel form of phase state in the context of polymer chains. Applications to polymers and proteins, in particular collagen, are suggested.
Place, publisher, year, edition, pages
2015. Vol. 92, no 3, 032602
IdentifiersURN: urn:nbn:se:uu:diva-264627DOI: 10.1103/PhysRevE.92.032602ISI: 000361310700003OAI: oai:DiVA.org:uu-264627DiVA: diva2:864309
FunderSwedish Research CouncilCarl Tryggers foundation