Collapsing and reswelling kinetics of thermoresponsive polymers on surfaces: a matter of confinement and constraints

• Published in: Soft matter Vol. 10; no. 37; pp. 7256 - 7261
• Main Authors: Willet, Nicolas, Gabriel, Sabine, Jérôme, Christine, Du Prez, Filip E, Duwez, Anne-Sophie
• Format: Journal Article Web Resource
• Language: English
• Published: England Royal Society of Chemistry 07.10.2014
• Subjects: Architecture; Atomic Force Microscopy; Chains (polymeric); Chemistry; Chimie; Collapsing; Confinement; Force Spectroscopy; Grafting; Macromolecular engineering; Nanostructure; Physical, chemical, mathematical & earth Sciences; Physics; Physique; Physique, chimie, mathématiques & sciences de la terre; Polymer brushes; Silicon substrates; Thermoresponsive polymers; Vinyl ethers
• ISSN: 1744-683X; 1744-6848; 1744-6848
• DOI: 10.1039/c4sm01266f

We report on the collapsing and reswelling ability of grafted poly(methyl vinyl ether) chains of different molecular architectures. In order to study the influence of constraints and confinement of the chains, the polymer was grafted onto AFM tips, as a model of a curved nano-sized surface, and onto macroscopic silicon substrates for comparison purposes. AFM-based force spectroscopy experiments were performed to characterise at the nanoscale the temperature-dependent collapsing process and the reversibility to the swollen state on both substrates. The reversible character of the thermoresponsive transition and its kinetics were shown to greatly depend on the polymer architecture and the constraints encountered by the chains.