Meetings of Interest

A method of increasing the yield of a high purity polyamic acid that is the reaction product of a diamino compound and a polycarboxylic acid dianhydride, comprises: 1. purifying an inert solvent by distillation or ion-exchange; 2. purifying the dianhydride by sublimation; 3. purifying the diamino compound by a slurry process that involves the repeated washing of the diamino compound first with deionized water and then methanol; and 4. reacting the purified diamino compound with the purified dianhydride in the purified inert solvent.