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  • Letter

Marginally compact phase and ordered ground states in a model polymer with side spheres

Tatjana Škrbić*

Trinh Xuan Hoang†

Achille Giacometti‡

Amos Maritan§

Jayanth R. Banavar∥

  • Department of Physics and Institute for Fundamental Science, University of Oregon, Eugene, Oregon 97403, USA and Dipartimento di Scienze Molecolari e Nanosistemi, Università Ca' Foscari di Venezia, Campus Scientifico, Edificio Alfa, Via Torino 155, 30170 Venezia Mestre, Italy

  • Institute of Physics, Vietnam Academy of Science and Technology, 10 Dao Tan, Ba Dinh, Hanoi 11108, Vietnam

  • Dipartimento di Scienze Molecolari e Nanosistemi, Università Ca' Foscari di Venezia, Campus Scientifico, Edificio Alfa, Via Torino 155, 30170 Venezia Mestre, Italy and European Center for Living Technologies, Ca' Bottacin, Dorsoduro 3911, Calle Crosera, 30123 Venezia, Italy

  • Dipartimento di Fisica e Astronomia, Università di Padova and INFN, Via Marzolo 8, 35131 Padova, Italy

  • Department of Physics and Institute for Fundamental Science, University of Oregon, Eugene, Oregon 97403, USA

  • *tskrbic@uoregon.edu
  • †hoang@iop.vast.ac.vn
  • ‡achille.giacometti@unive.it
  • §amos.maritan@unipd.it
  • ∥Corresponding author: banavar@uoregon.edu
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Phys. Rev. E 104, L012501 – Published 26 July, 2021

DOI: https://doi.org/10.1103/PhysRevE.104.L012501

Abstract

We present the results of a quantitative study of the phase behavior of a model polymer chain with side spheres using two independent computer simulation techniques. We find that the mere addition of side spheres results in key modifications of standard polymer behavior. One obtains a marginally compact phase at low temperatures; the structures in this phase are reduced in dimensionality and are ordered, they include strands assembled into sheets and a variety of helices, and at least one of the transitions on lowering the temperature to access these ordered states is found to be first order. Our model serves to partially bridge conventional polymer phases with biomolecular phases.

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Phys. Rev. E 104, L012501– Published 26 July, 2021
  • Received 4 May 2021
  • Accepted 14 June 2021
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