The determination of polymerization degree of ammonium polyphosphate by end-group titration;
端基滴定法测定聚磷酸铵聚合度
Conclusion was made by comparing with the test result of nuclear magnetic resonance spectroscopy:the end-group titration is only suitable for testing average degree of polymerization of ammonium polyphosphate product with high water dissolvability and not suitable for produc.
根据端基滴定测试聚磷酸铵平均聚合度的方法,从交换过程、交换产物、滴定过程进行讨论,以及与核磁共振方法测定结果比较,认为聚磷酸铵平均聚合度的测试方法——端基滴定法只适宜测定水溶性的聚磷酸铵产品平均聚合度,对于水溶性差且平均聚合度大的聚磷酸铵产品用端基滴定法测定平均聚合度是不可行的。
Polymerization process, after-treatment process, after-treatment of unstable end-group, control method for crystalline core size are reviewed.
综述了可熔性聚四氟乙烯(PFA)的聚合工艺、后处理工艺、不稳定端基处理工艺、晶核尺寸的控制方法。