Tough and self-healable nanocomposite hydrogels from poly(acrylic acid) and polyacrylamide grafted cellulose nanocrystal crosslinked by coordination bonds and hydrogen bonds

编号 020025205

推送时间 20200817

研究领域 林产化工 

年份 2020 

类型 期刊 

语种 英语

标题 Tough and self-healable nanocomposite hydrogels from poly(acrylic acid) and polyacrylamide grafted cellulose nanocrystal crosslinked by coordination bonds and hydrogen bonds

来源期刊 Cellulose

期 第252期

发表时间 20190624

关键词 Poly(acrylic acid);  Cellulose nanocrystal;  Nanocomposite hydrogel;  Mechanical property;  Self-healing; 

摘要 Developing self-healable hydrogels with excellent mechanical performance is important for their potential applications. In this paper, tough and self-healable dual physically crosslinked nanocomposite hydrogels reinforced with polyacrylamide grafted cellulose nanocrystal (CNC-g-PAM) were fabricated by in situ free radical polymerization of acrylic acid (AA) monomers in the presence of FeCl3 (0.75% of AA mole) and CNC-g-PAM (1–3% of AA mass). The primary network of PAA/CNC-g-PAM nanocomposite hydrogels was constructed via coordination bonds between carboxylic groups from PAA and Fe3+ ions, while CNC-g-PAM served as both reinforcing nanofillers and physical crosslinkers via hydrogen bonds between PAA matrix and PAM chains on the surface of CNC. The nanocomposite hydrogels exhibited simultaneously improved elastic modulus, tensile strength and elongation at break with the increase of CNC-g-PAM loading. The dynamic nature of both coordination bonds and hydrogen bonds endowed the nanocomposite hydrogels with excellent energy dissipation, self-recovery ability and autonomous self-healing capacity.

服务人员 尚玮姣

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