Preparation and Properties of Bamboo-based Oxide Fiber Film Materials
In this study,for the preparation of biomass-based membrane materials with good mechanical properties and antimicrobial activity,bamboo pulp board was used to prepare dialdehyde cellulose(DAC),which contained 7.99 mmol/g aldehyde groups by sodium periodate oxidation and hot water extraction.Bamboo-based oxide fiber film materials(DAC-DGEG,DAC-G,DAC-GTE,DAC-SA)were prepared by solution casting method via adding cross-linking agents of poly diglycidyl ether of diethylene glycol(DGEG),glycerol(G),glycerin tri-glycidyl ether(GTE),and sodium alginate(SA)mixed at a mass ratio of 4∶1,respectively.Scanning electron microscopy(SEM),Fourier infrared spectroscopy(FT-IR),and mechanical testing were used to investigate the microstructure,chemical structure,mechanical properties and anti-bacterial activities of composite films.The results indicated that tensile strength and elongation at break of DAC film was 11.7 MPa and 0.46％,respectively.In the visible range,the transmittance of DAC film was 92％.Adding crosslinking agents into DAC enhanced mechanical property of composite films.Glycerol and sodium alginate could effectively improve mechanical properties of the DAC films.The corresponding composite membranes,DAC-G and DAC-SA,enhanced the tensile strength by 125％and 113％,and the elongation at break increased by 6.48 and 5.09 times,compared with those of DAC membranes.The effect of the addition of cross-linking agent on the optical properties and antimicrobial activity of the DAC membranes was not obvious,and the light transmittance of DAC-G and DAC-SA composite membranes was 90％and 88％.The aldehyde group in the composite membranes had good activity,and showed excellent inhibition of E.coli,S.aureus,C.albicans and B.subtilis.
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