Reentrant Phase Transition of Strong Polyelectrolyte Poly(N-isopropylacrylamide) Gels in PEG Solutions

Enhanced solvation effect of re-collapsing behavior for cross-linked PMMA particle gel in aqueous alcohol solutions

“…In order to calculate swelling behavior of cross-linked gel, a determination of cross-linking parameter, m c , is necessary. This is not an easy task because the amount of cross-linker is unclear due to the loss of cross-linker from multiple cross-linking and cyclization during the gel formation process [21]. Therefore, theoretical m c value calculated from the initial feed of cross-linker is quite different from that in actual system.…”

“…Therefore, theoretical m c value calculated from the initial feed of cross-linker is quite different from that in actual system. There have been several experimental approaches for the determination of the effective cross-link density, including mechanical measurements [56,57], NMR spectroscopy [58,59], and equilibrium swelling [21,60]. In this work, we determined the effective m c value with the equilibrium swelling method.…”

“…Marchetti et al [20] considered free volume in the free energy of mixing as a third pseudo-component. Okay et al [21] developed a swelling model for ternary system, combining the Flory-Huggins (FH) mixing contribution with the Flory affine elastic contribution. Maurer et al [22,23] employed the excess Gibbs energy model based on the UNIQUAC equation with a free volume contribution to describe their reentrant swelling data.…”

Swelling Behaviors of Poly(N‐isopropylacrylamide) Nanosized Hydrogel Particles/Poly(vinyl alcohol)/Water Systems: Effect of the Degree of Hydrolysis of PVA

“…Lian et al developed a lattice molecular thermodynamic model for describing the swelling behaviors of thermally sensitive core–shell hydrogels. In addition to the influence of small organic solvent as a third substance, the addition of the liquid polymer has also been widely investigated . Although the swelling behaviors of PNIPA gels in low polymer solutions have been studied over the past two decades, there are only a few experimental data in high polymer solutions because of the unusual features of such systems.…”

Rheological properties of poly(ethylene glycol)/poly(N‐isopropylacrylamide‐co‐2‐acrylamido‐2‐methylpropanesulphonic acid) semi‐interpenetrating networks

“…In the swollen state, the interactions between the hydrophilic network of the gels and solvent water, as well as long‐range Coulombic interactions, significantly affect the physical and mechanical properties of the gels12, 25. A study on NIPA‐AMPS copolymer gels (with ≤10 mol % AMPS) swollen in PEG aqueous solution showed26 that NIPA segments in the copolymer network have strong interactions with PEG molecules. A recent thermal analysis study12 has shown that PEG has strong interactions with AMPS‐NIPA copolymer network in the dried state.…”