Chemical and physical reinforcement behavior of dialdehyde nanocellulose in PVA composite film: A comparison of nanofiber and nanocrystal

被引:142
作者
Lee, Hohyun [1 ]
You, Jinhwa [1 ]
Jin, Hyoung-Joon [1 ]
Kwak, Hyo Won [2 ,3 ]
机构
[1] Inha Univ, Dept Polymer Sci & Engn, 100 Inha Ro, Incheon 22212, South Korea
[2] Seoul Natl Univ, Dept Forest Sci, 1 Gwanak Ro, Seoul 08826, South Korea
[3] Seoul Natl Univ, Res Inst Agr & Life Sci, 1 Gwanak Ro, Seoul 08826, South Korea
基金
新加坡国家研究基金会;
关键词
Nanocellulose; PVA; Aldehyde group; Crosslinking; Water stability; CELLULOSE NANOCRYSTALS; CROSS-LINKING; BARRIER PROPERTIES; POLY(VINYL ALCOHOL); PERIODATE-OXIDATION; WATER; NANOWHISKERS; ACID; GLUTARALDEHYDE; PRETREATMENT;
D O I
10.1016/j.carbpol.2019.115771
中图分类号
O69 [应用化学];
学科分类号
081704 ;
摘要
Nanocellulose can be categorized into cellulose nanofibers (CNFs) and cellulose nanocrystals (CNCs). CNFs and CNCs are oxidized by periodate oxidation to introduce dialdehyde groups, which can act as a crosslinking agent. Polyvinyl alcohol (PVA) is widely used in food packaging, however, it is vulnerable to aqueous environments. In this study, dialdehyde nanocellulose-reinforced PVA nanocomposite films were fabricated to enhance the water resistance. CNF and CNC were oxidized using varying amounts of sodium periodate and the selected fillers were designated as DCNF and DCNC, respectively. In the case of DCNF, physicochemical networking effect was induced to PVA, while DCNC showed only chemical network reinforcement effect. However, both PVA/DCNF and PVA/DCNC composite films have significantly improved vulnerabilities in moisture environment compared to PVA films. These results indicate that while physical network structures are important, the chemically formed network structures can play a crucial role in enhancing the water resistance of PVA films.
引用
收藏
页数:10
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