By S. S. Labana (Auth.)
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Their degree of swelling is inversely proportional to their degree of crosslinking. Typically, lg of a 1% crosslinked polymer will swell to occupy a volume of 10ml in benzene while in the same solvent lg of a 5% crosslinked polymer will only swell to occupy 4ml. Good swelling solvents include halogenated hydrocarbons such as dichloromethane, chloroform and carbon tetrachloride; aromatics such as benzene, toluene or pyridine; and cyclic ethers such as tetrahydrofuran or dioxane. Swelling of the resin beads is very important as it brings the polymer to a state of complete solvation and thus allows easy penetration of the network by the molecules of reagent.
41 Isopiestic molecular weights are given in Table 10, again showing higher molecular weights than for II (still, Mn of 2080 -degree of polymerization 1 4 ) . LINEAR AND CROSSLINKED AB-TYPE POLYURETHANES TABLE 10. Number Average Molecular Benzoxazin-2-one* Polymerization Weights of Polymers 133- M Conditions Bulk Thermal Refluxing Dibutylether Hsopiestic method^4 From 39 170-176° using 2080 1630 95% THF/5% H20 Upon heating of III for 1 hour under isothermal conditions under N2 in the DSC, almost no change was noted at 200°.