Temperature-dependent interfacial properties of hydrophobically end-modified poly(2-isopropyl-2-oxazoline)s assemblies at the air/water interface and on solid substrates

Thermo-responsiveness of poly(-diethylacrylamide) polymers at the air–water interface: The effect of a hydrophobic block

“…In order to describe the transition occurring in two-dimensions (2-D), instead of the coil-to-globule picture used in bulk (3-D), it seems more adequate to use the image of a swollen pancake-todense pancake transition at the interface to explain the decrease of area per segment of the PDcA 11 -b-PDEA 231 when the temperature increases from 10 to 40 • C. Similar results were observed in the temperature range of 10-30 • C for the hydrophobically modified PNIPAM (NIPAM-octadecylacrylate (ODA)) [23] and in the 14-36 • C range for the ABA telechelic copolymer (in which the poly(2-isopropyl-2-oxazoline) thermo-responsive B block is linked at both ends with C 18 -alkyl groups (A)) by Obeid et al [39]. The Brewster angle microscope (BAM) observation of that telechelic polymer at the air-water interface allowed the identification of pancake type aggregates at 14 • C that change to spaghetti aggregates at 36 • C above the LCST transition of the thermo-responsive block.…”

“…However, hydrophobically modified thermo-sensitive polymers and copolymers composed of hydrophobic moieties show significant variations of their isotherms with temperature [33][34][35][36][37][38][39][40][41]. The few studies known show that the thermo-responsiveness of these copolymers at the air-water interface depends on the content of hydrophobic moieties attached as terminal blocks or introduced as comonomers in the polymer backbone.…”

“…The few studies known show that the thermo-responsiveness of these copolymers at the air-water interface depends on the content of hydrophobic moieties attached as terminal blocks or introduced as comonomers in the polymer backbone. Polymers, with a very low content of hydrophobic groups introduced in the polymer backbone of PNIPAM [38] or attached at the ends of the poly(2-isopropyl-2-oxazoline) (PIPOZ) thermo-responsive block [39] present deviations to lower molecular areas with temperature increase. An opposite trend was observed when the hydrophobic block is similar or longer than the thermo-responsive block.…”

Synthesis of Amphiphilic Polymers Based on Fatty Acids and Glycerol‐Derived Monomers – A Study of Their Self‐Assembly in Water

“…Amiel and co‐workers designed polyoxazoline end‐capped with fatty acids and described the self‐aggregation in micelles of these macromolecules, exhibiting dissymmetry in size of blocks. Winnick and co‐workers developed similar systems where the polyoxazoline segment showed a heat‐induced phase transition (32 to 62 °C) depending on polymer structure and chain length. These architectures formed core–shell micelles in cold aqueous solutions of the polymers.…”

Facile preparation of gold nanoparticles through autoreduction of gold ions in the presence of fluoroalkyl end-capped cooligomeric aggregates: LCST-triggered sol–gel switching behavior of novel thermoresponsive fluoroalkyl end-capped cooligomeric nanocomposite-encapsulated gold nanoparticles

“…There has recently an increasing interest in ''smart" polymers (environmentally responsive polymers) because of a wide variety of their potential practical applications such as soluble polymer supports in syntheses, photosensitive materials, drug-delivery systems, the design of biomaterials, and chromatographic supports [1][2][3][4][5]. On the other hand, gold nanoparticles have attracted much attention due to their excellent physical and chemical characteristics [6,7].…”