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Handbook of Solvents - George Wypych - ChemTech - Ventech!

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270 Ligia Gargallo and Deodato Radic<br />

Table 5.4.1. Comparison between theory and experiment in cosolvents <strong>of</strong> PMMA.<br />

From Fernandez-Pierola. 65 (Copyright by H�thig & Wepf Verlag (Basel), used with<br />

permission)<br />

Solvent 1 Solvent 2<br />

Experiment<br />

(dTp/dx)0 x10 -2 K<br />

Theory<br />

(dTc/dx)0 x10 -2 K<br />

Acetonitrile Amylacetate -11.1 -18.0<br />

Acetonitrile Chlorobutane -9.4 -9.4<br />

Acetonitrile CCl4 -12.3 -7.2<br />

Acetonitrile BuOH -7. 6 -12.5<br />

4-Chloro-n-butane Acetonitrile -3.2 -4.6<br />

1-Chloro-n-butane BuOH -17.0 -14.0<br />

Table 5.4.2 Liquid mixtures which are cosolvents <strong>of</strong> PMMA. From Horta and<br />

Fernandez Pierola. 64 (Copyright by Butterworth-Heineman Ltd., used with permission)<br />

Acetonitrile (AcN) + 4-Heptanone (Hna) a)<br />

Acetonitrile (AcN) + Isopentyl acetate (iPac) a)<br />

Acetonitrile (AcN) + Pentylacetate (Pac) a)<br />

Acetonitrile (AcN) + 1-Chlorobutane (BuCl) a)<br />

Acetonitrile (AcN) + Carbon tetrachloride (CCl 4) a)<br />

Acetonitrile (AcN) + Isopentyl alcohol (iPOH) a)<br />

Acetonitrile (AcN) + Pentyl alcohol (POH) a)<br />

Acetonitrile (AcN) + 1-Butanol (BuOH) a)<br />

Acetonitrile (AcN) + Isopropyl alcohol (iPrOH) a)<br />

Formamide (FA) + Ethanol (EtOH) a)<br />

1-Chlorobutane (BuCl) + Isopentyl alcohol (iPOH) a)<br />

1-Chlorobutane (BuCl) + Pentyl alcohol (POH) a)<br />

1-Chlorobutane (BuCl) + 2-Butanol (sBuOH) b)<br />

1-Chlorobutane (BuCl) + Isopropyl alcohol (iPrOH) a)<br />

Carbon tetrachloride (CCl 4) + 1-Butanol (BuOH) c)<br />

Carbon tetrachloride (CCl 4) + Ethanol (EtOH) c)<br />

Carbon tetrachloride (CCl 4) + Methanol (MeOH) c)<br />

a) Ref. 65, b) Ref. 47, c) Ref. 6 6<br />

In the case <strong>of</strong> PMMA, several powerful cosolvent mixtures have been reported. 65,46,47<br />

In such systems, a small proportion <strong>of</strong> liquid 2, added to the polymer-liquid 1 solution, is<br />

enough to produce a large decrease in Tp, these cosolvents are accessible to phase separation<br />

determinations.<br />

In Table 5.4.2, a number <strong>of</strong> liquid mixtures are listed to act as cosolvents <strong>of</strong><br />

polymethylmethacrylate (PMMA). 65,47,64,67 Intrinsic viscosity [η] has been reported in<br />

cosolvent mixtures containing CCl 4: CC1 4/methanol, 42,66<br />

ethanol, 66 1-propanol, 66<br />

1-butanol, 66 1-chlorobutane, 67 and acetonitrile, 68 and acetonitrile/methanol. 68 It was also reported<br />

the [η] <strong>of</strong> PMMA in the cosolvent mixture acetonitrile/1-chlorobutane. 42 The last<br />

system is a powerful cosolvent. Acetonitrile forms powerful cosolvents for PMMA too with<br />

other liquids having a wide variety <strong>of</strong> chemical groups. 65 [η] has been reported for PMMA in<br />

acetonitrile/pentylacetate as a powerful cosolvent. 44 On the contrary, the mixture <strong>of</strong><br />

1-chlorobutane/pentyl acetate is a co-nonsolvent <strong>of</strong> the polymer. 44 Mixing acetonitrile, with<br />

pentylacetate or mixing acetonitrile with 1-butanol greatly increases solubility and pro-

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