竹基氧化纤维薄膜材料的制备及性能研究

Preparation and Properties of Bamboo-based Oxide Fiber Film Materials

为制备具有良好力学性能和抗菌活性的生物质基膜材料,以竹浆板为原料,经高碘酸钠氧化、热水抽提处理制备了含醛基7.99 mmol/g的二醛纤维素(DAC),按质量比4∶1分别加入交联剂聚乙二醇二缩水甘油醚(DGEG)、甘油(G)、丙三醇三缩水甘油醚(GTE)和海藻酸钠(SA),混合后通过溶液浇铸法制备竹基氧化纤维薄膜材料(DAC-DGEG、DAC-G、DAC-GTE、DAC-SA)。采用扫描电镜(SEM)、傅里叶红外光谱(FT-IR)、力学试验等方法对复合膜的微观形貌、化学结构、力学性能以及抗菌性进行了研究。结果表明:DAC膜的拉伸强度为11.7 MPa,断裂伸长率为0.46%,可见光范围透光率达到92%。交联剂的加入使复合膜的力学性能提高,其中甘油和海藻酸钠显著提高了DAC膜的力学性能,对应复合膜DAC-G和DAC-SA的拉伸强度较DAC膜分别增强了125%和113%,断裂伸长率较DAC膜分别增加了6.48倍和5.09倍。交联剂的加入对DAC膜光学性能和抗菌活性的影响不明显,DAC-G和DAC-SA复合膜透光率为90%和88%;复合膜中的醛基活性良好,对大肠杆菌、金黄色葡萄球菌、白色念珠菌和枯草芽孢杆菌均表现出优异的抑制效果。

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.