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Synthesis and solid-state organization of coil-ring-coil block copolymers
Silvia Rosselli1, Anne-Désirée Ramminger, Thomas Wagner
1Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany.
Chemistry (Weinheim an Der Bergstrasse, Germany)
|August 5, 2003
Summary
Researchers created novel ABA block copolymers using rigid macrocycles and flexible polystyrene. These polymers self-assemble into hollow cylindrical brushes in solution, but form lamellar structures in the solid state.
Area of Science:
- Polymer Chemistry
- Supramolecular Chemistry
- Materials Science
Background:
- Shape-persistent macrocycles offer unique structural properties.
- Block copolymers enable the design of complex self-assembling materials.
Purpose of the Study:
- To synthesize ABA coil-ring-coil block copolymers with a rigid macrocyclic core.
- To investigate the self-assembly behavior and solid-state morphology of these novel block copolymers.
Main Methods:
- Oxidative coupling of phenyl-ethynyl-butadienyl oligomers to form macrocycles.
- Carbodiimide-directed coupling with polystyrene carboxylic acid oligomers.
- X-ray and electron diffraction studies for structural analysis.
Main Results:
- Successful synthesis of ABA coil-ring-coil block copolymers.
- Self-assembly into supramolecular hollow cylindrical brushes in cyclohexane.
- Formation of a lamellar morphology in the solid state, with macrocycle columns layered between polystyrene.
Conclusions:
- The rigid macrocycle core dictates the self-assembly behavior.
- The block copolymer architecture influences the transition from solution to solid-state morphology.
- The study reveals a novel lamellar structure in the solid state.