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全氟乙烯丙烯共聚物(简称F_(46))是四氟乙烯与六氟丙烯共聚后得到的可以熔融挤出的氟塑料。由于在分子链上引进了共聚单元而降低了熔点和熔体粘度,显著地改善了加工性能。共聚物的性质与分子链上共聚单元的数量和分布密切相关,因此,测定共聚物的组成、组成分布和序列结构已成为共聚物研究的主要任务。但F_(46)不溶于溶剂中,不能用一般适用于可溶性聚合物的方法如核磁、凝胶色谱等来研究。多年来虽然建立了根据红外光密度比D_(982)/D_(2350)来测定F_(46)中全氟丙烯含量的方法,但此法误差较大,不能满足要求。至于测定F_(46)的组成分布和序列结构更是缺乏办法。
Perfluoroethylene propylene copolymer (F_ (46)) is a fluorine-containing plastic that can be melt-extruded after copolymerization of tetrafluoroethylene and hexafluoropropylene. Due to the introduction of the copolymerized units on the molecular chain, the melting point and the melt viscosity are lowered, and the processability is remarkably improved. The nature of the copolymer is closely related to the number and distribution of the copolymerized units on the molecular chain. Therefore, the determination of the composition, the compositional distribution and the sequence structure of the copolymer has become a major task in the study of the copolymer. However, F_ (46) is insoluble in solvents and can not be studied by methods generally applicable to soluble polymers such as NMR and gel chromatography. Although the method of determining the content of perfluoropropylene in F_ (46) by D_ (982) / D_ (2350) has been established over the years, the error of this method is too large and can not meet the requirements. As for the determination of F_ (46) the composition and sequence structure is even more lacking.