Self-Standing Nanocellulose Janus-Type Films with Aldehyde and Carboxyl Functionalities

被引:32
|
作者
Nypelo, Tiina [1 ,2 ,3 ]
Amer, Hassan [2 ,4 ]
Konnerth, Johannes [3 ]
Potthast, Antje [2 ]
Rosenau, Thomas [2 ]
机构
[1] Chalmers Univ Technol, Div Appl Chem, Dept Chem & Chem Engn, S-41296 Gothenburg, Sweden
[2] Univ Nat Resources & Life Sci, Div Chem Renewable Resources, Dept Chem, A-1180 Vienna, Austria
[3] Univ Nat Resources & Life Sci, Inst Wood Technol & Renewable Mat, Dept Mat Sci & Proc Engn, A-1180 Vienna, Austria
[4] Natl Res Ctr, Dept Nat & Microbial Prod Chem, Giza 12622, Egypt
基金
奥地利科学基金会;
关键词
CELLULOSE NANOCRYSTALS; DIALDEHYDE CELLULOSE; PERIODATE-OXIDATION; PAPER; MICROFIBRILS; PARTICLES; STABILITY; AMINES;
D O I
10.1021/acs.biomac.7b01751
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
Nanocellulose-based self-standing films are becoming a substrate for flexible electronics, diagnostics, and sensors. Strength and surface chemistry are vital variables for these film-based endeavors, the former is one of the assets of nanocellulose. To contribute to the latter, nanocellulose films are tuned with a side-specific functionalization, having an aldehyde and a carboxyl side. The functionalities were obtained combining premodification of the film components by periodate oxidation with ozone post-treatment. Periodate oxidation of cellulose nanocrystals results in film components that interact through intra- and intermolecular hemiacetals and lead to films with an elastic modulus of 11 GPa. The ozone treatment of one film side induces conversion of the aldehyde into carboxyl functionalities. The ozone treatment on individual crystals was largely destructive. Remarkably, such degradation is not observed for the self-standing film, and the film strength at break is preserved. Preserving a physically intact film despite ozone treatment is a credit to using the dry film structure held together by interparticle covalent linkages. Additionally, gas-phase post-treatment avoids disintegration that could result from immersion into solvents. The crystalline cellulose "Janus" film is suggested as an interfacial component in biomaterial engineering, separation technology, or in layered composite materials for tunable affinity between the layers.
引用
收藏
页码:973 / 979
页数:7
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