期刊
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
卷 7, 期 7, 页码 6981-6990出版社
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.8b06691
关键词
Cellulose; Chitosan; Functional fiber; Shape memory; Environmentally benign material
资金
- Major Program of National Natural Science Foundation of China [21334005]
- Major International (Regional) Joint Research Project [21620102004]
- Funds for International Cooperation and Exchange of the National Natural Science Foundation of China [21811530006]
- National Natural Science Foundation of China [51373147]
Because of the serious pollution caused by nondegradable plastic waste, environmentally benign materials from sustainable polymers have attracted tremendous research interest. Especially, functional fibers with good mechanical properties, shape memory behavior, and biodegradability have been required in the fields of smart textiles, sensors, and intelligent robots. Here, a new solvent, 4.5 wt % LiOH/7.5 wt % KOH/11.5 wt % urea aqueous solution, was developed to prepare stable cellulose/chitosan composite solution. Subsequently, cellulose/chitosan composite (CLS) fibers were spun successfully from the mixture solution on a lab-scale spinning machine. The CLS fibers exhibited good mechanical properties with tensile strength of 3.2 cN/dtex in the dry state and 2.9 cN/dtex in the wet state, as a result of the combination of good miscibility between two components and their nanofiber self-assembly driven by self-aggregation force through hydrogen bonding interactions. Interestingly, the CLS fibers showed a two-switch shape memory behaviors under water and acid stimulations. By changing the external stimulation, the strong self-aggregation force between cellulose and chitosan could be destroyed partly and then restructured to fix and recover, resulting in a designed shape. This work provided a new method for fabricating high strength and functional fibers for industry, which will promote the development of smart textiles.
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