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Handbook of Solvents - George Wypych - ChemTech - Ventech!

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6.4 Influence <strong>of</strong> structure on equilibrium swelling 333<br />

Table 6.4.2. Characteristics <strong>of</strong> polyurethane-solvent systems at 25 o C. [Adapted, by<br />

permission, from U.S. Aithal, T.M. Aminabhavi, R.H. Balundgi, and S.S. Shukla, JMS -<br />

Rev. Macromol. Chem. Phys., 30C (1), 43 (1990).]<br />

Penetrant Q max<br />

Halogenated aliphatics<br />

χ1 MC<br />

Chlor<strong>of</strong>orm 4.206 0.362 3839<br />

Brom<strong>of</strong>orm 5.583 0.435 4694<br />

1,2-Dibromoethane 1.855 0.412 770<br />

1,3-Dibromopropane 1.552 0.444 870<br />

Dichloromethane 2.104 0.34 1179<br />

Trichloroethylene 1.696 0.364 1098<br />

Tetrachlorethylene 0.832 0.368 429<br />

1,2-Dichlorethane 1.273 0.345 728<br />

Carbon tetrachloride 1.058 0.538 860<br />

1,4-Dichlorobutane 0.775 0.348 626<br />

1,1,2,2- Tetrachloroethane 5.214<br />

Miscellaneous liquids<br />

0.34 6179<br />

Methyl acetate 0.494 0.341 370<br />

Ethyl acetate 0.509 0.422 513<br />

Ethyl benzoate 0.907 0.34 1111<br />

Methyl ethyl ketone 1.261 0.364 2088<br />

Tetrahydr<strong>of</strong>uran 2.915 0.39 2890<br />

1,4-Dioxane 2.267 0.376 2966<br />

DMF 1.687 1.093 -1184<br />

DMSO 0.890 1.034 -975<br />

Acetonitrile 0.184 0.772 182<br />

Nitromethane 0.302 1.160 5734<br />

Nitroethane 0.463 0.578 382<br />

n-Hexane 0.069 1.62 2192<br />

Cyclohexane 0.176 0.753 287<br />

Benzyl alcohol 4.221<br />

In the second variant <strong>of</strong> evaluation <strong>of</strong> M c, data on the temperature dependence <strong>of</strong> volume<br />

fraction <strong>of</strong> polymer, ϕ 2 , in the swollen gel were used. Results <strong>of</strong> calculations <strong>of</strong> M c<br />

from the Flory-Rehner equation in some cases also gave negative values. The evaluation <strong>of</strong>

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