Study On The Synthesis, Characterization And Property Of A New Type Of Functional Fiber

The ion exchange fiber is a new type of the fibrous adsorption material which develops rapidly in the recent years. At present, the researches on the ion exchange fiber are mainly focused on selecting the variedly new fiber carriers, introducing the differently functional groups to the fiber carriers and exploring the synthetic method of the fiber. But the studies on the molecular framework design and synthesis of the fiber have little been reported.In view of the successful application of the Friedel-Crafts reaction in the molecular structure design and synthesis of the adsorption resins, on the base of the study on the crosslinking between chains, microcosmic appearance, synthetical mechanism of the hypercrosslinked resins systemically, for the first time in this article the design is put forward, which the Friedel-Crafts reaction is applied to the molecular framework design of the fiber. Novel non-polar functional fibers (HM-1 and HX-1) that have high specific surface area and abundant pore structure were prepared by cross-linking the polypropylene grafted styrene-divinylbenzene fiber with different crosslinking agents according to the Friedel-Crafts reaction. The specific surface area of the synthesized fiber is about 200m~2/g, 130m~2/g, respectively. In this article, the properties of the synthesized fibers including the rmicrocosmic appearance, the thermodynamic stability and so on were investigated and tested, and their swelling capabilities were also studied. The results show that the decompounded temperature of the synthesized fiber is increased by about 100K and the cross-linked fibers have good swelling capability in solvents and non-solvents.After the fibers were synthesized, the thermodynamics and kinetics of the adsorption for methanol vapor on the HM-1 fiber and for benzene vapor on the HX-1 fiber were systemically studied. The maximum of the adsorption capacity for the HM-1 and HX-1 fiber is about 230mg/g, 370mg/g, respectively, and it needs 8-10 minutes to reach the adsorption equilibrium.After the molecular frameword design and the synthesis of the fibers were successfully completed, the research work was farther developed. Two kinds of strong acid ion exchange fiber (HMS-1 and HXS-1) and two kinds of strong alkaline ion exchange fiber (HMA-1 and HXA-1), which have different exchange capacities and internal structures, were prepared by introducing the differently functional groups to the HM-1 and HX-1 fiber respectively. A series of adsorption experiments were made for aniline and phenol on the synthesized fiber, respectively, which are common pollutants in the organic waste water. And, the thermodynamics and kinetics of the fiber in the adsorption process were studied in detailed. Because of the adsorption superposition in the functional chemistry groups and internal structure of fiber, the several kinds of synthesized fibers all have excellent adsorption capacities. Their separation abilities were not only enhanced, but also their separation speeds were obviously heightened, which consequently can establish certain foundation for its applications in correlated fields.