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Molecular Mass on Solubility

The solubility of chemically related compounds decreases with increasing molecular mass since the intermolecular forces of interaction increase. For example, benzene is completely miscible with ethanol, whereas anthracene and ethanol are only partially miscible. The influence of molecular mass on solubility is particularly evident in macromolecules. For example, alcohol, acetone, and acetic acid readily dissolve styrene, but not polystyrene vinyl aeetate dissolves in saturated hydrocarbons and ether, whereas poly(vinyl acetate) does not. Cellulose is insoluble in alcohols, polyfethylene glycol) is insoluble in ethers, poly(vinyl chloride) is insoluble in vinyl chloride, and polyacrylonitrile is insoluble in acetonitrile, even though good solubility would be expected on account of the chemical relation between the polymers and monomers. [Pg.290]

On account of their very large molecular mass, highly cross-linked polymers do not dissolve in solvents, even at elevated temperature. They are, however, swollen by solvents depending on the nature and density of the cross-linking sites [14.61], [14.62]. [Pg.290]


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