丙烯酸全氟烷基乙基酯嵌段共聚物的组成结构表征

含氟聚合物具有独特的性质 ,使其成为高分子材料领域中的特殊功能材料 .这类聚合物具有高表面活性、高热稳定性、高化学稳定性 ,及既憎水又憎油的“三高”、“两憎”特性1] ,可用作织物拒水拒油整理剂、防污涂料、流平剂等 .然而含氟单体价格高昂 ,人们希望在满足性能要求的同时 ,尽量减少氟单体的用量 .利用分子设计方法 ,制备结构规整的嵌段共聚物无疑是一种有效的方法 .目前 ,文献中关于含氟嵌段共聚物的制备的方法有负离子聚合法2 ] 、基团转移聚合法 (GTP) 3 ] 、正离子聚合法4] 、引发 转移 终止法 (Iniferter) 5] ,以及近年…

COMPOSITIONAL CHARACTERIZATION OF DIBLOCK COPOLYMER OF METHYL ACRYLATE AND PERFLUOROALKYLETHYL ACRYLATE

The diblock copolymers of methyl acrylate and perfluoroalkyl ethyl acrylate(FAEA) were synthesized by atom transfer radical polymerization (ATRP).GPC, 1H-NMR and fluorine-elementary analysis (F-EA) were used to study the structure of the block copolymers.To combine GPC with NMR and to combine GPC with F-EA were used to calculate the block length.It was found interestingly that the results of 1H-NMR showed a “temperature-dependent" feature.It means the relative ratios of MA block to FAEA block calculated from NMR were changed with measuring temperature.It might be caused by the formation of molecular association.Temperature and solvents can affect the degree of association.Therefore, 1H-NMR and GPC can't be used in quantitative analysis of the fluorinated diblock copolymer.To combine GPC with F-EA is suitable for the characterization of fluorinated diblock copolymers.