Cylindrical Micelles by the Self-Assembly of Crystalline- b -Coil Polyphosphazene- b -P2VP Block Copolymers. Stabilization of Gold Nanoparticles

During the last number of years a variety of crystallization-driven self-assembly (CDSA) processes based on semicrystalline block copolymers have been developed to prepare a number of different nanomorphologies in solution (micelles). We herein present a convenient synthetic methodology combining: (...

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Bibliographic Details
Published in:Molecules (Basel, Switzerland) Switzerland), 2019-05, Vol.24 (9), p.1772
Main Authors: Cortes, Maria de Los Angeles, de la Campa, Raquel, Valenzuela, Maria Luisa, Díaz, Carlos, Carriedo, Gabino A, Presa Soto, Alejandro
Format: Article
Language:English
Subjects:
Anionic polymerization
Block copolymers
Cationic polymerization
Copolymers
Crystallization
crystallization-driven self-assembly
cylindrical micelles
Gold
gold nanoparticles
Macromolecules
Micelles
Molecular weight
Nanoparticles
P2VP
Phosphazene
Polymerization
Polymers
polyphosphazene
Polyphosphazenes
Polyvinyl pyridine
Self-assembly
Solvents
Tetrahydrofuran
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Summary:During the last number of years a variety of crystallization-driven self-assembly (CDSA) processes based on semicrystalline block copolymers have been developed to prepare a number of different nanomorphologies in solution (micelles). We herein present a convenient synthetic methodology combining: (i) The anionic polymerization of 2-vinylpyridine initiated by organolithium functionalized phosphane initiators; (ii) the cationic polymerization of iminophosphoranes initiated by -PR Cl ; and (iii) a macromolecular nucleophilic substitution step, to prepare the novel block copolymers poly(bistrifluoroethoxy phosphazene)- -poly(2-vinylpyridine) (PTFEP- -P2VP), having semicrystalline PTFEP core forming blocks. The self-assembly of these materials in mixtures of THF (tetrahydrofuran) and 2-propanol (selective solvent to P2VP), lead to a variety of cylindrical micelles of different lengths depending on the amount of 2-propanol added. We demonstrated that the crystallization of the PTFEP at the core of the micelles is the main factor controlling the self-assembly processes. The presence of pyridinyl moieties at the corona of the micelles was exploited to stabilize gold nanoparticles (AuNPs).
ISSN:1420-3049
1420-3049
DOI:10.3390/molecules24091772