Preparation of Siloxane-Polyurethane Copolymer and Its Application to Coating of Quartz Fibres Used as Adsorptive Material in SPME for Separation of Arenes from Water

A siloxane-polyurethane copolymer was prepared using toluene-2,4-di-iso-cyanate,polyethyleneglycol hexanedioate,1,6-hexandiol and hydroxy silicone oil as main reactants,and its properties characterized by the methods of IRS,SEM,and EDS.The prepared copolymer was mixed with toluene-2,4-di-iso-cyanate and used to coat on the surface of quartz fibres,which were used to prepared the extractor head of the SPME equipment.Arenes in water sample were extracted and separated from the headspace sample vessel and determined by GC.As shown by the experimental results,the extractor head prepared from the quartz fibers coated with the copolymer could be used at temparatures up to 260 ℃ and the Si-particles were dispersed evenly on the surface of the coating.Values of height of chromatographic peaks of benzene,chlorobenzene and nitrobenzene were found to keep linear relationships with their corresponding mass concentrations in the same range within 50.0 μg·L-1,with values of their detection limit of 0.432,0.756,and 0.511 μg·L-1 respectively.