发布时间:2025-01-20 00:23:19
甲醛水溶液中有环状聚合物。刚生产出来的甲醛水溶液静置时会自动生成低分子聚合物,形成聚氧甲烯基醇的混合物,同时部份出现沉淀。甲醛易氧化,聚合,其浓溶液在室温下长期放置就能自动聚合成三分子的环状聚合物,在一定催化剂的条件下,高纯度甲醛可以聚合成多聚甲醛。
峨眉山脚下的一居民家里住看到柜子上摆放着一个小人胸前有菱形标志看着很诡异
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