Thermodynamic and kinetic effects in the aggregation behavior of a poly(ethylene glycol-b-propylene sulfide-b-ethylene glycol) ABA triblock copolymer

Simona Cerritelli, Antonella Fontana, Diana Velluto, Marc Adrian, Jacques Dubochet, Paolo De Maria, Jeffrey A. Hubbell

Research output: Contribution to journalArticle

33 Citations (Scopus)

Abstract

We explore the effects of preparation protocol on the morphology and stability of aggregates from a poly(ethylene glycol-b-propylene sulfide-b-ethylene glycol) triblock copolymer, PEG44-PPS 76-PEG44. Fluorescence spectra and excimer formation of the probe molecule pyrene elucidated the various stages of aggregate formation, and cryo-TEM yielded insight into aggregate morphology. When prepared by direct hydration of polymer films, an extraordinary variety of morphologies was formed, ranging from spherical micelles to wormlike micelles, Y-junctions, blackberry micelles, and vesicles. Aging produced more uniform structural ensembles, including wormlike micelles with undulations and eventually spherical micelles, indicating the nonequilibrium nature of the system as initially formed. On the contrary, preparation by dilution from organic solvent yielded only structures that were closer to equilibrium distributions.

Original languageEnglish
Pages (from-to)7845-7851
Number of pages7
JournalMacromolecules
Volume38
Issue number18
DOIs
StatePublished - Sep 6 2005
Externally publishedYes

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Ethylene Glycol
Micelles
Ethylene glycol
Polyethylene glycols
Block copolymers
Propylene
Agglomeration
Thermodynamics
Kinetics
Pyrene
Polymer films
Hydration
Organic solvents
Dilution
Aging of materials
Fluorescence
Sulfides
propylene sulfide
Transmission electron microscopy
Molecules

ASJC Scopus subject areas

  • Materials Chemistry

Cite this

Thermodynamic and kinetic effects in the aggregation behavior of a poly(ethylene glycol-b-propylene sulfide-b-ethylene glycol) ABA triblock copolymer. / Cerritelli, Simona; Fontana, Antonella; Velluto, Diana; Adrian, Marc; Dubochet, Jacques; De Maria, Paolo; Hubbell, Jeffrey A.

In: Macromolecules, Vol. 38, No. 18, 06.09.2005, p. 7845-7851.

Research output: Contribution to journalArticle

Cerritelli, S, Fontana, A, Velluto, D, Adrian, M, Dubochet, J, De Maria, P & Hubbell, JA 2005, 'Thermodynamic and kinetic effects in the aggregation behavior of a poly(ethylene glycol-b-propylene sulfide-b-ethylene glycol) ABA triblock copolymer', Macromolecules, vol. 38, no. 18, pp. 7845-7851. https://doi.org/10.1021/ma051176u
Cerritelli, Simona ; Fontana, Antonella ; Velluto, Diana ; Adrian, Marc ; Dubochet, Jacques ; De Maria, Paolo ; Hubbell, Jeffrey A. / Thermodynamic and kinetic effects in the aggregation behavior of a poly(ethylene glycol-b-propylene sulfide-b-ethylene glycol) ABA triblock copolymer. In: Macromolecules. 2005 ; Vol. 38, No. 18. pp. 7845-7851.
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