title: Patchy Supramolecular Bottle-Brushes Formed by Solution Self-Assembly of Bis(urea)s and Tris(urea)s Decorated by Two Incompatible Polymer Arms.
abstract: In an attempt to design urea-based Janus nanocylinders through a supramolecular approach, nonsymmetrical bis(urea)s and tris(urea)s decorated by two incompatible polymer arms, namely, poly(styrene) (PS) and poly(isobutylene) (PIB), were synthesized using rather straightforward organic and polymer chemistry techniques. Light scattering experiments revealed that these molecules self-assembled in cyclohexane by cooperative hydrogen bonds. The extent of self-assembly was limited for the bis(urea)s. On the contrary, reasonably anisotropic 1D structures (small nanocylinders) could be obtained with the tris(urea)s (Nagg ∼ 50) which developed six cooperative hydrogen bonds per molecule. (1)H transverse relaxation measurements and NOESY NMR experiments in cyclohexane revealed that perfect Janus nanocylinders with one face consisting of only PS and the other of PIB were not obtained. Nevertheless, phase segregation between the PS and PIB chains occurred to a large extent, resulting in patchy cylinders containing well separated domains of PIB and PS chains. Reasons for this behavior were proposed, paving the way to improve the proposed strategy toward true urea-based supramolecular Janus nanocylinders.
authors.affiliation: LUNAM Université, Université du Maine, IMMM - UMR CNRS 6283, Université du Maine , av. O. Messiaen, 72085 cedex 9 Le Mans, France.
authors.forename: Sylvain
authors.initials: S
authors.lastname: Catrouillet
authors.affiliation: Sorbonne Universités, UPMC Univ Paris 06, CNRS, Institut Parisien de Chimie Moléculaire, Equipe Chimie des Polymères , 4 Place Jussieu, F-75005 Paris, France.
authors.forename: Laurent
authors.initials: L
authors.lastname: Bouteiller
authors.affiliation: Laboratoire de Chimie Catalyse Polymères et Procédés (C2P2), Université de Lyon, Univ. Lyon 1, CPE Lyon, CNRS UMR 5265, Bat 308F, 43 Bd du 11 Novembre 1918, 69100 Villeurbanne, France.
authors.forename: Olivier
authors.initials: O
authors.lastname: Boyron
authors.affiliation: Université Paris Est, ICMPE (UMR7182), CNRS, UPEC , F-94320 Thiais, France.
authors.forename: Cédric
authors.initials: C
authors.lastname: Lorthioir
authors.affiliation: LUNAM Université, Université du Maine, IMMM - UMR CNRS 6283, Université du Maine , av. O. Messiaen, 72085 cedex 9 Le Mans, France.
authors.forename: Erwan
authors.initials: E
authors.lastname: Nicol
authors.affiliation: Sorbonne Universités, UPMC Univ Paris 06, CNRS, Institut Parisien de Chimie Moléculaire, Equipe Chimie des Polymères , 4 Place Jussieu, F-75005 Paris, France.
authors.forename: Sandrine
authors.initials: S
authors.lastname: Pensec
authors.affiliation: LUNAM Université, Université du Maine, IMMM - UMR CNRS 6283, Université du Maine , av. O. Messiaen, 72085 cedex 9 Le Mans, France.
authors.forename: Olivier
authors.initials: O
authors.lastname: Colombani