The results indicated that the proper content of free SO3 in fuming sulfuric acid in ringopening polymerization were about 30%.

 
  • 實(shí)驗結果表明開(kāi)環(huán)聚合宜采用30%25濃度的發(fā)煙硫酸,通過(guò)正交實(shí)驗得到了聚合反應的最佳條件;
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