Polyfmethyl methacrylate solubility parameter

As an example of the use of Small s table the solubility parameter of polyfmethyl methacrylate) may be computed as follows ... 

The data can now be represented more conveniently in a triangular diagram, as in Fig. 12-2. This plot shows the approximate limiting solubility boundaries for polyfmethyl methacrylate). The boundary region separates efficient from poor solvents. The probable solubility parameters of the solute polymer will be at the heart of the solubility region. The boundaries are often of greater interest than the central region of such loops because considerations of evaporation rates, costs, and other properties may also influence the choice of solvents. 

As may be expected of an amorphous polymer in the middle range of the solubility parameter table, polyfmethyl methacrylate) is soluble in a number of solvents with similar solubility parameters. Some examples were given in the previous section. The polymer is attacked by mineral acids but is resistant to alkalis, water and most aqueous inorganic salt solutions. A number of organic materials although not solvents may cause crazing and cracking, e.g. aliphatic alcohols. 

Problem 3.17 Calculate the solubility parameter for a methyl methacrylate-butadiene copolymer containing 25 mol % methyl methacrylate. The solubility parameter values for polyfmethyl methacrylate) (PMMA) and polybutadiene (PB) homopolymers, calculated from molar attraction constants, are, respectively, 9.3 and 8.4 (cal cm ). ... 

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See also in sourсe #XX -- [ ]

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