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[求助] 表面活性剂

想请问一下,在选择表面活性剂时应该先考虑krafft点还是CMC,因为CMC越小说明表面活性剂越好,而且krafft点越高,CMC值越小,但是十二烷基硫酸钠和十二烷基磺酸钠的Krafft点分别约为8℃和70℃,显然,后者在室温下表面活性作用不够理想。那么在这里70℃虽然比8℃高,但是CMC却比较小,所以说(* ̄m ̄)要怎么理解比较好?

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