期刊
CHEMICAL ENGINEERING JOURNAL
卷 392, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2019.123673
关键词
Cellulose nanopaper; Shape memory; Humidity sensitivity; Cellulose nanofibrils; Chitosan
资金
- National Natural Science Foundation of China [31870568, 31700509]
- Shandong Provincial Natural Science Foundation for Distinguished Young Scholar (China) [ZR2019JQ10]
- Major Program of Shandong Province Natural Science Foundation [ZR2018ZB0208]
- Shandong Provincial Natural Science Foundation, China [ZR2018BC044]
- project of Qingdao post-doctoral application research [Y633121905]
- Foundation of Key Laboratory of Pulp and Paper Science and Technology of Ministry of Education/Shandong Province of China [KF201802]
Water-induced shape memory polymers (SMPs) are the desired candidates for the uses in the fields of surgical operation, smart textile, and aerospace. However, most of water-induced SMPs are non-biodegradable petroleum-based polymers, and a quick response to water of SMPs is usually accompanied with the loss of wet strength due to the over hydration. To address this issue, in this work, a water resistant cellulose nanopaper (CNP) was firstly prepared with the cellulose nanofibrils (CNFs) produced by formic acid hydrolysis, and then the obtained CNP was modified via immersing in chitosan (CS) for the preparation of a robust CNP with quick water and humidity responses. Results showed that the original shape of the modified CNP after folding could immediately respond to water ( < 3 s) and humidity ( < 10 min). This quick response of the modified CNP was due to the synergistic hydration of CS and CNFs network, and the presence of CNFs with ester groups could prevent the over hydration of the modified CNP. Furthermore, the strong interactions between CS and CNFs and the reduced defects of CNP after modified with CS endow the final CNP with excellent mechanical performance (particular for the robust folding resistance (over 1190 times) and high wet tensile strength (65 MPa)), high transparency, as well as good barrier properties and antibacterial properties. Hence, the resultant CNP has potential applications in the fields of surgical operation, smart textile, humidity sensor, and high-quality packaging.
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