从丝瓜络废料中提取纤维素纳米纤维及在聚乙烯醇超临界二氧化碳复合发泡材料中的应用  

Extraction of cellulose nanofibers from waste of loofah and application in polyvinyl alcohol supercritical carbon dioxide composite foams

作　　者：杨堃阳 邵亮[1] 崔梦媛 樊永康 姬占有 马建中 YANG Kun-yang;SHAO Liang;CUI Meng-yuan;FAN Yong-kang;JI Zhan-you;MA Jian-zhong(China Key Laboratory of Light Industry Light Chemical Auxiliaries,College of Chemistry and Chemical Engineering,Shaanxi University of Science and Technology,Xi’an 710021,China;Jihua 3513 Industrial Co.,Ltd.,Xi’an 710026,China;Xi’an Key Laboratory of Green Chemicals and Functional Materials,College of Bioresources Chemical and Materials Engineering,Shaanxi University of Science and Technology,Xi’an 710021,China)

机构地区：[1]陕西科技大学化学与化工学院中国轻工业轻化工助剂重点实验室,陕西西安710021 [2]际华三五一三实业有限公司,陕西西安710026 [3]陕西科技大学轻工科学与工程学院西安市绿色化学品与功能材料重点实验室,陕西西安710021

出　　处：《应用化工》2024年第3期525-529,共5页Applied Chemical Industry

基　　金：国家自然科学基金项目(22208202);陕西省创新能力支撑计划资助(2021TD-16);西安市科技计划项目(22GXFW0001)。

摘　　要：通过TEMPO氧化法从废弃丝瓜络中成功提取出纤维素纳米纤维(CNF),并通过超临界二氧化碳(scCO_(2))发泡技术制备聚乙烯醇(PVA)/CNF复合发泡材料。对CNF在复合材料中的结晶性进行表征,探究了CNF含量对泡孔形貌的影响以及CNF含量对发泡材料收缩性能的影响。结果表明,CNF在发泡过程中可作为异相成核点,提高成核效率,减小了平均泡孔尺寸,增加了泡孔密度,同时减少了泡孔褶皱,降低了发泡材料的收缩率。当CNF含量为2%时,平均孔径从99.96μm下降至41.96μm,泡孔密度增加了大约一个数量级,收缩率从12.19%下降至5.02%。Cellulose nanofibers(CNF)were successfully extracted from waste loofah by TEMPO oxidation,and polyvinyl alcohol(PVA)/CNF composite foam materials were prepared by supercritical carbon dioxide(scCO_(2))foaming technology.The crystallinity of CNF in composites was characterized,and the influence of CNF content on cell morphology and CNF content on shrinkage properties of foamed materials was explored.The result showed that CNF can be used as a heterogeneous nucleation point in the foaming process,which improves the nucleation efficiency,reduces the average cell size,increases the cell density,reduces the cell folds,and reduces the shrinkage rate of the foamed material.When the CNF content is 2%,the average pore size decreases from 99.96μm to 41.96μm,the cell density increases by about an order of magnitude,and the shrinkage rate decreases from 12.19%to 5.02%.

关 键 词：聚乙烯醇 纤维素纳米纤维 超临界二氧化碳 物理发泡 

分 类 号：TQ31[化学工程—高聚物工业] TQ35[理学—高分子化学] O631[理学—化学]