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Issue 19, 2015
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A cosolvency effect on tunable thermosensitive core–shell nanoparticle gels

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The influence of co-solvents on the swelling behavior of tunable thermosensitive core–shell nanoparticle gels was investigated. The poly(methyl methacrylate) (PMMA) core and poly(2-hydroxyethyl methacrylate) (PHEMA) shell network in 1-propanol reacted differently upon the addition of three co-solvents (cyclohexane (CHX), 1,3-propanediol (PDO), and water), resulting in highly controllable swelling properties of the core–shell gels. In particular, a strongly enhanced solvation effect, called the cosolvency phenomenon, occurred even with a very small amount of water (1–3 wt%). To examine the tunability, thermo-optical analysis (TOA) and photon correlation spectroscopy (PCS) were employed. The results show that a small addition of CHX, PDO, or water induced the “lower/upper,” “even/upper,” and “lower/lower” volume transition temperatures (VTTs) of the core–shell networks, respectively. For theoretical treatment, a multi-component lattice theory of mixing was combined with the Flory–Rehner (F–R) chain model to calculate the net free energy of mixing. The required interaction parameters were obtained from the binary and ternary phase diagrams of the linear polymer solutions and were applied directly to the swelling calculation of the cross-linked core–shell network solutions. The calculated results corresponded well with the experimental swelling data without further adjustment.

Graphical abstract: A cosolvency effect on tunable thermosensitive core–shell nanoparticle gels

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Supplementary files

Article information

23 Feb 2015
05 Apr 2015
First published
07 Apr 2015

Soft Matter, 2015,11, 3936-3945
Article type
Author version available

A cosolvency effect on tunable thermosensitive core–shell nanoparticle gels

S. M. Lee and Y. C. Bae, Soft Matter, 2015, 11, 3936
DOI: 10.1039/C5SM00448A

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