Handbook of Solvents - George Wypych - ChemTech - Ventech!

6.3 Swelling data 327
sorption of SL by polymer. Thus it is necessary to account for proximity of the compositions
of solvent in the swollen gel and the liquid phase.
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6.3 SWELLING DATA ON CROSSLINKED POLYMERS IN SOLVENTS
Vasiliy V. Tereshatov, Valery Yu. Senichev
Institute of Technical Chemistry
Ural Branch of Russian Academy of Sciences, Perm, Russia
Data on equilibrium swelling of selected crosslinked elastomers in different solvents are
presented in Table 6.3.2. All data were obtained in the author’s laboratory during the last 5
years. The network density values for these elastomers are given in Table 6.3.1.
The data can be used for the quantitative evaluation of thermodynamic compatibility
of solvents with elastomers and for calculation of ΔZ, the thermodynamic interaction parameter.
These data can be recalculated to the network density distinguished by the network
density value, given in Table 6.3.1, using Eq. [4.2.9]. Network density values can be used
for the calculation of the interaction parameter. It should be noted that each rubber has specific
ratio for the equilibrium swelling values in various solvents. This can help to identify
rubber in polymeric material.
Temperature influences swelling (see Subchapter 4.2). Equilibrium swelling data at
four different temperatures are given in Table 6.3.3.
Polymer samples were made from industrial rubbers. The following polyols were used
for preparation of polyurethanes: butadiene diol (M~2000) for PBU, polyoxybutylene glycol
(M~1000) for SCU-PFL, polyoxypropylene triol (M~5000) for Laprol 5003,
polydiethylene glycol adipate (M~2000) for P-9A and polydiethylene glycol adipate
(M~800) for PDA. Polyurethanes from these polyols were synthesized by reaction with
2,4-toluylene diisocyanate with addition of crosslinking agent - trimetylol propane, PDUE,
synthesized by reaction of oligobutadiene isoprene diol (M~4500) with double excess of
2,4-toluylene diisocyanate, followed by the reaction with glycidol.