A series of“hairy-rod”polyimides,BBPA(n),with multiple alkyl side chains was prepared from 3,3’,4,4’-biphenyltetracarboxylic dianhydride(BPDA)and 4,4’-bip
ETA have lower volatility, stronger alkalescence, lower decomposition rate, and now over 60% nuclear power plant in the world using ETA to replace NH3 as pH adj