The dialdehyde cellulose (DHBC) was abtained by oxidation of bacterial cellulose (BC) using sodium periodate at 40℃ and pH 1.0 in the dark.And then three kinds of dialdehyde bacterial cellulose-gelatin composites (DB-G) (DB-G5,DB-G10,DB-G15,respectively) were prepared by reaction of DHBC and gelatin solution at 50℃and pH 6.0±0.1.By FTIR spectra analysis,the absorption peak of CO (1 740 cm-1) of DB-G disappeared,on the contrary,and the typical bands for amide Ⅰv(CO)appeare at 1 600~1 680 cm-1and for amide Ⅱv(N-H) at 1 500~1 550 cm-1,in which the absorption peaks become hypsochromic shift and widening with the increase of bonding gelatin.According to the degradation test results in the simulated body fluid(SBF),DHBC and DB-G showed good biodegradable and the cycle of degradation are basically 60~90 d.The pore diameter of DB-G5,DB-G10 and DB-G15 gradually decrease based on the analysis and test of DB-G by specific surface area,pore diameter distribution and SEM.From the test results of pyrolytic temperature (TG/DTG),compared with the BC,the pyrolysis temperature of DHBC fall rapidly,and the maximum weight loss temperature(Tmax) drop 80.1℃.The thermal stability of DB-G was improved considerably after crosslinking with gelatin,in whichTmaxwere greater than 340℃,butTmaxof DB-G10 and DB-G15 were less than 2℃.Similarly,from tensile strength test,DB-G15 is not further improved than DB-G10 with the increase of gelatin.Comprehensive analysis,the appropriate mass ratio of DHBC and gelatin is 1:10 that DB-G10 can be as a kind of potential biomass-based tissue engineering scaffold material.
