Spontaneous bending of 2D molecular bottle-brush
Institute of Petrochemical Synthesis, Russian Academy of Sciences, 119991, Moscow, Russia
2 Laboratory of Polymer Chemistry and Materials Science Centre, University of Groningen, Nijenborgh 4, 9747 AG, Groningen, The Netherlands
Accepted: 12 April 2006
Published online: 15 May 2006
Using a scaling approach we consider a 2D comb copolymer brush under bending deformations. We show that the rectilinear brush is locally stable and can be characterized by a persistence length λ increasing with the molecular weight of grafting side chains as λ ∼ M 3. A bending instability due to redistribution of the side chains appears in the non-linear regime where bending is strong. Arguments are presented that the brush conformations consist of alternating rectilinear and bent sections corresponding to the different free-energy minima.
PACS: 82.35.Jk Copolymers, phase transitions, structure – / 89.75.Fb Structures and organization in complex systems –
© EDP Sciences, Società Italiana di Fisica and Springer-Verlag, 2006