Study On The Immobilization Of Functional Molecule Onto Pp Non-woven Fabrics And Their Adsorption Behavior

In this paper, with polyepichlorohydrin (PECH), polyvinyl chloride (PVC) and Vinyl chloride-acetate as the raw materials, the azide group was introduced into corresponding polymer chains by substitution of chloride atom, and three kinds of polymeric azides were prepared. Several effect factors of the azidation were investigated, and some of azidated polymers were characterized by using FTIR,XPS and Thermal analysis, The results revealed that the azide group was indeed introduced into polymer chains. Gelatin was immobilized onto PP non-woven fabrics(PNF) with polymeric azides as photolinker assisted by UV radiation. the optimum condition of immobilization could be given as follow:①concentration of GAP(3) solution 8.3g/L and 12.5g/L, coating process 1+1, UV radiation for 30min, the immobilization quantity can reach 9.33g/g(L) and 3.59g/g(R), respectively.②concentration of azidated PVC(4) 10g/L, coating process 1+1, UV radiation for 30min, the immobilization quantity can reach 7.89g/g(L) and 3.81g/g(R), respectively.③concentrain of azidated Vinyl chloride-acetate(4) 10g/L, coating process 1+1, UV radiation for 30min, the immobilization quantity can reach 6.10g/g(L) and 3.41g/g(R), respectively.The content of gelatin immobilized on PNF were determined by using 3-dioxohydrindene-amino acid color spectorphotometry, and its water absorption was studied, The influence of immobilization quantity on immobilization rate, water absorption and amino acid immobilization quantity were discussed as well. It was found that the immobilization rate and amino acid immobilization quantity increase with immobilization quantity meeted positive correlation, and water absorption was reduced as the immobilization quantity increased. The adsorption of tannin by gelatin immobilized on PNF was studied in this work. When stirring 3h in 50mL tannin solution (200mg/L) at 20℃by using 0.2g GAP immobilization products(immobilization quantity 0.79g/g(R)) as adsorbent, the removal percentage of tannin and adsorption quantity Q can reach 92.4% and 0.0492g/g respectively, in the same condition,96.6% and 0.0514g/g can be achieved by using 0.2g azidated PVC immobilization products(immobilization quantity 3.12g/g(R)) as adsorbent,97.7% and 0.1300g/g by using 0.2g azidated Vinyl chloride-acetate(immobilization quantity 2.34g/g(R)) as adsorbent, but stirring for 24h at room temperature. The results show that the the adsorption quantity has obvious regularity in adsorptivity. The result indicates that the adsorption quality could be increased by the lower concentration of tannin solution, the longer adsorption time and the higher quantity of immobilization products.The gelatin immobilized on PNF and their adsorbed sample were also characterized by using FTIR, SEM, XPS and thermal analysis. The results showed that the content of azide groups(corresponding FTIR adsorbance at 2100cm-1) were significantly reduced or even disappeared after UV radiation. Chemical composition and its contribution groups were determined by XPS. The results from TG,DTG and DTA revealed that the gelatin molecules had been immobilized onto PNF. The emergence of tannin structure on the adsorbed sample confirmed that tannin had been adsorbed on the surface of gelatin immobilized on PNF. The surface morphology of PNF had been changed greatly after immobilization of gelatin, gelatin filled between PP fibers and PP fibers became thicker after adsorption, its surface was covered with adsorbate. These results revealed that tannin has been adsorbed on the surface of immobilization product.