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FRACTIONATION OF REACTIVE PERFLUOROPOLYOXYALKYLENE OLIGOMERS

机译:活性全氟氧羰基亚烷基低聚物的分馏

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Fractional distillation, solubility fractionation, and column chromatographic separation have been applied in the study of fractionation of perfluoropoly(oxymethylene-co-oxyethylene) oligomers with - CH2OH end units, containing mono and bifunctional species. With a suitable choice of conditions, all three techniques proved to be useful for the preparation of fractions with narrow molecular weight distribution. Column chromatography allowed the separation of fractions having, in addition, sharp mono and bifunctionality. On the basis of the experimental results, general indications for designing reactive oligomers fractionation procedures are discussed, prevalently centered on the copolymer end effect, which is typically present in this kind of compound. (C) 1995 John Wiley and Sons, Inc. [References: 9]
机译:分馏,溶解度分馏和柱色谱分离已用于分馏具有-CH2OH端基的全氟聚(甲醛-共-氧化乙烯)低聚物的研究,该低聚物包含单官能和双官能物质。在适当选择条件的情况下,所有三种技术均证明可用于制备分子量分布窄的馏分。柱色谱法允许分离另外具有尖锐的单官能度和双官能度的级分。根据实验结果,讨论了设计反应性低聚物分馏程序的一般指示,主要集中在这类化合物中通常存在的共聚物末端效应上。 (C)1995 John Wiley and Sons,Inc. [参考:9]

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