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Dynamic Behavior of Supramolecular Comb Polymers Consisting of Poly(2‐Vinyl Pyridine) and Palladium‐Pincer Surfactants in the Solid State
Author(s) -
Davidi Inbal,
HermidaMerino Daniel,
KeinanAdamsky Keren,
Portale Giuseppe,
Goobes Gil,
Shenhar Roy
Publication year - 2014
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201303139
Subject(s) - small angle x ray scattering , pincer movement , pulmonary surfactant , polymer , pyridine , supramolecular chemistry , alkyl , palladium , crystallization , materials science , polymer chemistry , crystallography , stacking , molecule , chemical engineering , chemistry , scattering , organic chemistry , optics , engineering , catalysis , physics
When poly(2‐vinyl pyridine) is combined with Pd‐pincer‐based organometallic surfactants, a mesomorphic structure forms due to weak stacking interactions between the pyridine units and the Pd‐pincer headgroups. The weak binding between the surfactant and the polymer competes with the tendency of the aliphatic tails of the surfactant to crystallize. Here, we demonstrate that over extended periods of incubation, the crystallization tendency of the surfactant tails causes the surfactant molecules to detach from the polymer and gives rise to additional packing modes of the alkyl tails featuring higher crystalline order. The dynamic behavior of these aged structures was investigated by variable‐temperature small‐angle X‐ray scattering (SAXS) and solid‐state 13 C NMR, and revealed the influence of thermal changes on the molecular level, and how these changes propagate to the mesoscale structure.