Originally posted by natcop at 2010-10-09 21:47:29:
各位同学，有谁知道怎样检测聚乙二醇含量和平均分子量？
详细信息：从厂家购买80%质量浓度聚乙二醇，标称分子量为300—400,所含其他物质未知，据说，超临界液相可以做……问，有无其他简便方法？

Originally posted by hyWoo at 2010-10-11 14:06:35:
热重Tg是可以的

Originally posted by onjie at 2010-10-10 00:12:31:
粘度法啊！https://www.docin.com/p-42549885.html