基于温敏改性纳米纤维素的复合水凝胶薄膜的制备及其分子透过性能  

Preparation of Temperature-sensitive Modified Nano-cellulose Composite Hydrogel Film and Its Molecular Permeability

作　　者：白永 周益名[1] 李特 薛国新[1] 孟育 童树华 BAI Yong;ZHOU Yiming;LI Te;XUE Guoxin;MENG Yu;TONG Shuhua(College of Textile Science and Engineering(International Institute of Silk),Zhejiang Sci-Tech University,Hangzhou 310018,China;Zhejiang Jinchang Specialty Co.,Ltd.,Quzhou 324404,China)

机构地区：[1]浙江理工大学纺织科学与工程学院(国际丝绸学院),浙江杭州310018 [2]浙江金昌特种纸股份有限公司,浙江衢州324404

出　　处：《材料科学与工程学报》2023年第2期186-192,268,共8页Journal of Materials Science and Engineering

基　　金：国家自然科学基金资助项目(21908202);中国博士后科学基金第67批面上资助二等资助项目(2020M671794)。

摘　　要：利用溴代—接枝两步法将N-异丙基丙烯酰胺(NIPAAm)接枝聚合到纤维素纳米微晶(CNCs)表面,制备得到PNIPAAm改性的CNCs(P-CNCs),并将该P-CNCs分散于海藻酸钠(SA)基体中,得到复合水凝胶薄膜。对改性P-CNCs进行了结构和性能的表征,并研究了P-CNCs的温度响应特性对复合水凝胶薄膜分子透过性能影响。结果表明,改性P-CNCs保持了棒状结构但相比于CNCs直径变大,晶型保持不变但是结晶度降低。当环境温度高于低临界转变温度(LCST)时,P-CNCs悬浮液的透光率增大。添加P-CNCs制备的复合水凝胶薄膜,其热稳定性相比与其他水凝胶薄膜有所提高。当环境温度≥LCST时,添加P-CNCs的复合水凝胶薄膜的水蒸气透过性相比环境温度25℃时明显提高,300 min后水蒸气透过量相比提高了17%;而相比于添加CNCs的水凝胶薄膜,其相同时间下的水蒸气透过量提高了28.6%。亚甲基蓝分子透过性实验表明,在环境温度≥LCST的条件下,添加P-CNCs的复合水凝胶薄膜其分子透过速度要显著大于添加未改性CNCs的水凝胶薄膜,且分子透过速度随着P-CNCs添加量的增大而增大。N-isopropylacrylamide(NIPAAm)was grafted onto cellulose nanocrystalline(CNCs)surface by bromo-grafting two steps methods,and PNIPAAm-modified CNCs(P-CNCs)were prepared.The P-CNCs were dispersed in sodium alginate(SA)as matrix to obtain composite hydrogel films.The structure and properties of the modified P-CNCs were characterized,and the effect of the temperature-response of P-CNCs on the molecular permeability of the composite hydrogel films was studied.The results showed that the modified P-CNCs maintained a rod-like structure,but the diameter of the modified P-CNCs was larger,and the crystallinity of the modified P-CNCs was reduced.When the ambient temperature was higher than the low critical transition temperature(LCST),the light transmittance of P-CNCs suspension increased.Compared with other hydrogel films,the thermal stability of composite hydrogel films prepared by adding P-CNCs was improved.When the ambient temperature was higher than LCST,the water vapor permeability of the composite hydrogel film with P-CNCs was significantly increased compared with that at 25℃,and the water vapor permeability increased by 17%after 300 min.Compared with the hydrogel film with CNCs,the water vapor transmittal increased by 28.6%in the same time.Methylene blue molecular permeability experiments showed that the molecular permeability of the composite hydrogel films with P-CNCs added was significantly higher than that with unmodified CNCs added at ambient temperature≥LCST,and the molecular permeability increased with the increase of P-CNCs added.

关 键 词：纳米纤维素 N-异丙基丙烯酰胺 温敏改性 水凝胶 分子透过 

分 类 号：TQ314.1[化学工程—高聚物工业]