| http://www.w3.org/ns/prov#value | - The reaction is carried out in an alkaline liquid medium comprising water, a strong inorganic base such as an alkali metal hydroxide, e.g. sodium or potassium hydroxide, and an essentially water-insoluble organic solvent which is a solvent for the polymer such as, for example, benzene, toluene, xylene, etc., halogenated hydrocarbons such as dichloromethane, ethylene dichloride, propylene dichlorid
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