聚苯撑基硅氧烷交联毛细管柱的研究

使用静态涂渍法，在毛细管柱内壁涂渍新型苯撑基色谱固定液，通过原位交联，提高了液膜不可抽提性及稳定性。苯基通常被连接在聚硅氧烷硅原子的侧链上，如果两个硅原子之间通过苯联结而不是通过氧原子联结，则可形成聚苯撑基硅氧烷［１］，这种聚硅氧烷的弹性好。采用含５０％聚苯撑基硅氧烷研制出交联毛细管柱，并对制备过程重复程度进行了考察，评价了柱子的综合性能，简单介绍了柱子的极性及适用范围。

Study on Cross Linked Capillary Columns Coated with Polyphenylenesiloxane

A new type of cross-linked capillary column coated with polyphenylenesiloxane which possesses phenylene in the siloxane main chain has been described in this paper. The cross-linking of polyphenylenesiloxane was performed in situ by the induction of DCUP. The structure of polyphenylenesiloxane is as followed: [structure: see text] The repeatabilities and solvent inextractabilities of the column preparations were investigated. For decane and 1-octanol, the values of n/L and k' at 120 degrees C were 2800-3100 and 1.0-1.3, 2400-2800 and 5.0-6.0, respectively. The k' values of the columns scarcely changed after eluting with methylene chloride and pentane. The base-acid property was studied by analyzing 2,6-dimethylphenol and 2,6-dimethylaniline. Besides, in comparision with OV-17 and OV-25, the McReynolds' constants of the cross-linked column were also determined. The advantages of this kind of column are summarized as (1) easy preparation; (2) heat stability improved; and (3) good selectivity for the organic compounds which contain halogen, nitro group or phenol.