摘要
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.
Abstract
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.
基金项目
云南省科技厅应用基础研究项目(202101BD070001-076)
云南省"兴滇英才支持计划"青年人才资助项目(XDYC-QNRC-2022-0175)
国家自然科学基金资助项目(32260369)
维普
万方数据