A Reversible Tube-to-Rod Transition in a Block Copolymer Micelle
- 16 July 2003
- journal article
- Published by American Chemical Society (ACS) in Journal of the American Chemical Society
- Vol. 125 (32), 9546-9547
- https://doi.org/10.1021/ja030251i
Abstract
A remarkable morphology transition occurs with a change in temperature for a diblock copolymer [poly(ferrocenyldimethylsilane-b-dimethylsiloxane) (PFS40-b-PDMS480, PDI = 1.01)] in n-decane solution. This polymer, which forms nanotubes at 25 °C, rearranges to form short dense rods when the solution is heated to 50 °C. When the solution is cooled to 25 °C, the system evolves back to nanotubes. These experiments demonstrate that both structures are dynamic and represent equilibrium states of the material. Contrast matching static light-scattering measurements on the short dense rods show that the insoluble PFS core is rigid and has a length distribution similar to that seen in electron microscopy images.Keywords
This publication has 7 references indexed in Scilit:
- Nanotubes from the Self-Assembly of Asymmetric Crystalline−Coil Poly(ferrocenylsilane−siloxane) Block CopolymersJournal of the American Chemical Society, 2002
- Fiberlike Structures from the Self-Assembly of a Highly Asymmetric Poly(ferrocenyldimethylsilane-b-dimethylsiloxane) in Dilute SolutionLangmuir, 2002
- Self-Assembly of Organometallic Block Copolymers: The Role of Crystallinity of the Core-Forming Polyferrocene Block in the Micellar Morphologies Formed by Poly(ferrocenylsilane-b-dimethylsiloxane) in n-Alkane SolventsJournal of the American Chemical Society, 2000
- Dynamic Light ScatteringPublished by Oxford University Press (OUP) ,1993
- Determination of the Flory–Huggins parameter, the heat of dilution, and the excess heat capacity of some alkanes in polydimethylsiloxane by gas chromatographyJournal of Polymer Science: Polymer Physics Edition, 1974
- Thermodynamic Interaction in Polydimethylsiloxane-Hydrocarbon Systems from Gas-Liquid ChromatographyMacromolecules, 1972
- The Solubilization of Four Typical Hydrocarbons in Aqueous Solution by Three Typical Detergents.The Journal of Physical Chemistry, 1951