PRODUCTION AND PURIFICATION OF ALKOXYPHOSPHAZENE POLYMER

摘要

Alkoxyphosphazene polymer is prepared in a homogeneous system by admixing chloropolymer dissolved in cyclohexane or a mix of cyclohexane and C5-C7 alkane with alkali metal alkoxide dissolved in tetrahydrofuran, reacting, desalting the resulting reaction solution and concentrating by a first step involving admixing non-solvent which is cyclohexane (and/or C5-C7 alkane if that is also present in the reaction solution) to cause coagulation thereby forming a higher viscosity rubber phase enriched in polymer and a lower viscosity liquid phase depleted in polymer and separating the rubber and liquid phases and a second step involving evaporating the residual solvent and non-solvent. The first concentrating step is preferably carried out utilizing an extruder.