Polymeric systems

 

Coarse-graining has been of fundamental importance in the field of polymer modeling. In order to study the large size of polymer chains and the associated slow relaxation processes, a reduction of the degrees of freedom has proven absolutely necessary.  Although the Martini model has been designed for biomolecular applications, there is no reason why the same philosophy could not be extended to soft matter in general. Indeed there is a growing number of basic polymer systems for which Martini parameters have been derived, currently including polyethyleneglycol (PEG) [1,11], polystyrene [2,9], triblock copolymers [3,10], polyester coatings [4], polymer nanofibres [5], dendrimers [6], and amphipols [8].

polymer2

 
 
 

One of the advantages of the broad scope of Martini is the ability to easily combine different systems. In the context of polymers, this is demonstrated by studies of dendrimers and copolymers interacting with lipid membranes [6,10], and simulations of pegylated lipids [7]. We expect many more of these Martini  hybrid simulations in the near future ...

  • [1] H. Lee, A.H. de Vries, S.J. Marrink, R.W. Pastor. A coarse-grained model for polyethylene oxide: conformation and hydrodynamics. J. Phys. Chem. B, 113:13186-13194, 2009. abstract
  • [2] G. Rossi, L. Monticelli, S. R. Puisto, I. Vattulainen and T. Ala-Nissila. Coarse-graining polymers with the MARTINI force-field: polystyrene as a benchmark case. Soft Matter, 7:698-708, 2011.
  • [3] M. Hatakeyama, R. Faller. Coarse-grained simulations of ABA amphiphilic triblock copolymer solutions in thin films, Phys Chem Chem Phys 9:4662-4672, 2007.
  • [4] G. Rossi, I. Giannakopoulos, L. Monticelli, N.K.J. Rostedt, S.R. Puisto, C. Lowe, A.C. Taylor, I. Vattulainen, T. Ala-Nissila. A MARTINI coarse-grained model of a thermoset polyester coating. Macromolecules, ASAP, 2011.
  • [5] A. Milani, M. Casalegno, C. Castiglioni, G. Raos. Coarse-grained simulations of model polymer nanofibres, Macromol. Th. Sim. ASAP, 2011.
  • [6] H. Lee, R.G. Larson, Coarse-grained molecular dynamics studies of the concentration and size dependence of fifth- and seventh-generation PAMAM dendrimers on pore formation in DMPC bilayer, J Phys Chem B 112:7778-7784, 2008.
  • [7] H. Lee, R.W. Pastor. Coarse-grained model for PEGylated lipids: effect of PEGylation on the size and shape of self-assembled structures. J. Phys. Chem. B, ASAP, 2011
  • [8] J.D. Perlmutter, W.J. Drasler, W. Xie, J. Gao, J.L. Popot , J. Sachs. All-atom and coarse-grained molecular dynamics simulations of a membrane protein stabilizing polymer. Langmuir, ASAP, 2011.
  • [9] G Rossi, I.G. Elliott, T. Ala-Nissila, R. Faller. Molecular dynamics study of a MARTINI coarse-grained polystyrene brush in good solvent: structure and dynamics. Macromolecules, ASAP, 2011. DOI: 10.1021/ma201980k
  • [10] S. Hezaveh, S. Samanta, A. De Nicola, G. Milano, D. Roccatano. Understanding the Interaction of Block Copolymers with DMPC Lipid Bilayer using Coarse-Grained Molecular Dynamics Simulations. J. Phys. Chem. B, Just Accepted Manuscript, 2012. DOI: 10.1021/jp306565e
  • [11] G. Rossi, P. Fran├žois, J. Fuchs, J. Barnoud, L. Monticelli.A Coarse-Grained Martini Model of Polyethylene Glycol and of Polyoxyethylene Alkyl Ether Surfactants. J. Phys. Chem. B, Just Accepted Manuscript, 2012. DOI: 10.1021/jp3095165