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Effects of strongly selective additives on volume phase transition in gels
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10.1063/1.4732857
/content/aip/journal/jcp/137/2/10.1063/1.4732857
http://aip.metastore.ingenta.com/content/aip/journal/jcp/137/2/10.1063/1.4732857
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

The swelling curves of a gel immersed in a mixture solvent. We set ϕ30 = 1.0 × 10−2, νv 0 = 1.0 × 10−5, B = 1.15, and χ12 = 0.0. In the absence of additives, the gel undergoes volume phase transition with increasing χ31. We dissolve solutes of χ23 = −1.0 (pro-gel) in (a) and χ23 = 1.0 (anti-gel) in (b). The black solid lines are calculated from Eq. (21).

Image of FIG. 2.
FIG. 2.

The swelling curves of a gel immersed in a mixture solvent. We set ϕ30 = 1.0 × 10−2, νv 0 = 1.0 × 10−5, B = 1.15, and χ12 = 0.0. We dissolve solutes of χ23 = −10.0 (pro-gel) in (a) and χ23 = 10.0 (anti-gel) in (b). The black solid lines are calculated from Eq. (21). The additives have strong selectivities to the polymer network.

Image of FIG. 3.
FIG. 3.

(a) The shifts of the transition point from are shown for several values of χ23. The shift is numerically obtained with the same parameters as in Figs. 1 and 2. For χ23 = 7.5 and 10.0, the transition points are terminated since the discontinuous volume changes disappear. (b) The dependence of Δχ31t on χ23 is plotted for ϕ2s = 0.001. The broken curve represents [Eq. (26)] with ϕ3c = 0.0267 and .

Image of FIG. 4.
FIG. 4.

The gap of the volume fraction ϕ3 at the transition is plotted with ϕ2s. We set ϕ30 = 1.0 × 10−2, νv 0 = 1.0 × 10−5, B = 1.15, and χ12 = 0.0 as in Figs. 1 and 2.

Image of FIG. 5.
FIG. 5.

The swelling curves of a gel immersed in a mixture solvent. We set ϕ30 = 1.0 × 10−2, νv 0 = 1.0 × 10−5, B = 1.10, and χ12 = 0.0. We dissolve the pro-gel solute of χ23 = −10.0. The black solid lines are calculated from Eq. (21). When ϕ2s = 0, the gel changes its volume continuously without VPT.

Image of FIG. 6.
FIG. 6.

The contours of the functions g [Eq. (26)] and h [Eq. (27)] are drawn in G3 planes (a) and (b), respectively. The transition point is increased linearly with ϕ2s in the region of for positive g. In the region of negative h, the volume gap of the transition point is increased.

Image of FIG. 7.
FIG. 7.

The swelling curves of a gel immersed in a mixture solvent in a wider range of χ31. We set ϕ30 = 1.0 × 10−2, νv 0 = 1.0 × 10−5, B = 1.15, and χ12 = 0.0. We dissolve the strongly good solute of χ23 = −10.0 and ϕ2s = 1.0 × 10−4. The black solid lines are calculated by Eq. (21) . The second volume phase transition is induced.

Image of FIG. 8.
FIG. 8.

The theoretical curves of and −h3, G2s are shown. When , the gel becomes mechanically unstable, showing the second volume phase transition.

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/content/aip/journal/jcp/137/2/10.1063/1.4732857
2012-07-10
2014-04-25
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Effects of strongly selective additives on volume phase transition in gels
http://aip.metastore.ingenta.com/content/aip/journal/jcp/137/2/10.1063/1.4732857
10.1063/1.4732857
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