一步法制备双醛基微纤化纤维素及其明胶复合膜  

One-step synthesis of dialdehyde microfibrillated cellulose and its composite film with gelatin

作　　者：林凤采 汪雪琴[1] 杨旋 卢贝丽 王思群[2,3] 黄彪[1] 林咏梅[1] LIN Fengcai;WANG Xueqin;YANG Xuan;LU Beili;WANG Siqun;HUANG Biao;LIN Yongmei(College of Material Engineering,Fujian Agriculture and Forestry University,Fuzhou 350108,Fujian,China;Research Institute of Wood Industry,Chinese Academy of Forestry,Beijing 100091,China;Center for Renewable Carbon,University of Tennessee,Knoxville 37996,USA)

机构地区：[1]福建农林大学材料工程学院,福建福州350108 [2]中国林业科学研究院木材工业研究所,北京100091 [3]美国田纳西大学可再生碳材料中心,美国诺克斯维尔37996

出　　处：《化工进展》2018年第4期1522-1528,共7页Chemical Industry and Engineering Progress

基　　金：林业公益性行科研专项(201504603);国家自然科学基金(31370560;21402027);福建省自然科学基金(2015J05046);福建农林大学杰出青年科研人才计划(xjq201503)项目

摘　　要：以竹浆纤维为原料,基于机械力化学法,在高碘酸钠氧化下一步法制备双醛基微纤化纤微素(dialdehyde microfibrillated cellulose,D-MFC),再与明胶交联构筑基于席夫碱键的D-MFC/明胶复合膜。采用透射电子显微镜(TEM)、傅里叶变换红外光谱分析仪(FTIR)、扫描电子显微镜(SEM)、热分析仪(TGA)和质构仪等对D-MFC和D-MFC/明胶复合膜的官能团、形貌结构、热稳定性和力学性能等进行表征与分析。结果表明,机械力化学法制备的D-MFC直径在10~50nm,长度在微米级,醛基含量为0.237mmol/g。D-MFC在复合膜中具有良好的分散性,D-MFC上的醛基与明胶中的氨基发生反应,形成席夫碱键,从而提高复合膜的热稳定性、拒水性和力学性能。当D-MFC添加量为2.0g时,其拉伸强度可达189.1MPa,最大热失重速率温度为338℃,吸湿率降低至11.14%。采用机械力化学法制备D-MFC具有工艺简便、绿色环保的优点,该生物质复合膜在生物医用材料领域具有潜在的应用价值。With bamboo pulp as the raw material and sodium periodate as the oxidant,dialdehyde microfibrillated cellulose(D-MFC)was prepared via a one-step reaction under mechanochemical conditions,and then crosslinked with gelatin to construct D-MFC/gelatin composite film based on the bond of Schiff base.The functional group,structural,morphological,thermo and mechanical properties of D-MFC and the composite film were studied using transmission electron microscopy(TEM),Fourier transformation infrared spectroscopy(FTIR),scanning electron microscopy(SEM),thermal gravimetric analyzer(TGA)and texture analyzer.The results indicated that the diameters of the obtained D-MFC ranged from 10nm to 50nm and the length was in micro level.In addition,the aldehyde content of D-MFC was determined to be 0.237mmol/g.The D-MFC particles could be well-dispersed in a composite film.The aldehyde group of the D-MFC could react with the amino group of gelatin to form a Schiff base which improved the thermal stability,water resistance and mechanical properties of the composite film.The tensile strength and the temperature corresponding to maximum weight loss of composite film with 2.0g D-MFC addition was determined to be 189.1MPa and 338℃,respectively,and the moisture content of composite film was reduced to 11.14%.This work provided a simple and environmentally benign approach to prepare dialdehyde microfibrillated cellulose and the D-MFC/gelatin composite film showed a great potential applications in the field of biomedical materials.

关 键 词：机械力化学 氧化 微纤化纤维素 生物质 复合材料 

分 类 号：TQ352[化学工程]