力学强度可调控的双醛微纤化纤维素/聚乙烯醇复合水凝胶的制备与性能研究  

Preparation and Properties of Dialdehyde Microfibrillated Cellulose/Poly(vinyl alcohol)Composite Hydrogels with Tunable Mechanical Properties

作　　者：马森森 岳英楠 刘捷[1] 邱建华 万纪强 汤克勇[1] 张军[3] 郑学晶[1] MA Sen-sen;YUE Ying-nan;LIU Jie;QIU Jian-hua;WAN Ji-qiang;TANG Ke-yong;ZHANG Jun;ZHENG Xue-jing(School of Materials Science&Engineering,Zhengzhou University,Zhengzhou 450000,China;Technology Center,China Tobacco Henan Industrial Co.,Ltd,Zhengzhou 450000,China;Institute of Chemistry,Chinese Academy of Sciences,Beijing 100190,China)

机构地区：[1]郑州大学材料科学与工程学院,郑州450000 [2]河南中烟工业有限责任公司技术中心,郑州450000 [3]中国科学院化学研究所,北京100190

出　　处：《高分子通报》2023年第9期1191-1199,共9页Polymer Bulletin

基　　金：国家自然科学基金(U2004211);河南中烟(A202014)。

摘　　要：本文探讨了可方便调控力学强度的双醛微纤化纤维素/聚乙烯醇(DAMFC/PVA)复合水凝胶。将DAMFC与PVA溶液混合,利用DAMFC上的醛基与PVA大分子链上羟基的缩醛反应制得DAMFC/PVA水凝胶,并用不同盐溶液进行浸泡。缩醛反应使增强体DAMFC与基体聚合物PVA之间以共价键方式相连接。在受到应力作用时,应力能高效地从增强体传递到基体,从而使复合水凝胶的力学强度显著提高。此外,经过盐溶液浸泡,盐析作用使PVA水凝胶的力学强度进一步提高,且阴离子种类对力学强度的影响很大。通过调控DAMFC的含量、高碘酸钠的氧化时间及盐溶液阴离子的选择,可在较大范围内调控PVA复合水凝胶的力学强度,以满足不同应用的需求。In this study,the dialdehyde microfibrillated cellulose/poly(vinyl alcohol)(DAMFC/PVA)composite hydrogels were investigated,with easily controlled mechanical strength.DAMFC/PVA hydrogels were prepared by the acetal reaction occurred between the aldehyde groups on the surface of DAMFC microfibers and the hydroxyl groups on the PVA macromolecular chains.Then the hydrogels were soaked in various salt solutions.Due to the acetal reaction,the reinforcement DAMFC and the matrix polymer PVA were connected by covalent bonds.Under the stress,the load could be efficiently transferred from the reinforcement to the matrix,so that the mechanical strength of the composite hydrogel was significantly improved.In addition,due to the salting out effect,the mechanical strength of the hydrogels was further improved by soaking in salt solutions.The anion species of the salt had a great influence on the mechanical strength.By regulating the content of DAMFC,the oxidation time of NaIO4 and the selection of anion in salt solution,the mechanical strength of PVA composite hydrogels can be regulated in a wide range to meet the needs of different applications.

关 键 词：聚乙烯醇 双醛微纤化纤维素 水凝胶 盐溶液 力学强度 

分 类 号：TQ427.26[化学工程]