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聚酰亚胺前体——聚酰胺酸合成出现相分离的原因?
以ODA(AR、99%)和PMDA(AR、96%)为原料,以DMAc(AR)为溶剂,在冰水浴下反应,产生淡黄色乳浊液,粘度低,放置后出现相分离现象,请教下原因

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