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Water and humidity-induced shape memory cellulose nanopaper with quick response, excellent wet strength and folding resistance

[Display omitted] •A robust and water-induced shape memory CNP was prepared with CNFs and CS.•Fast response to water of the CNP is due to synergistic hydration of CS and CNFs.•The final CNP shows excellent wet strength and folding endurance.•The final CNP exhibits amazing barrier and antibacterial p...

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Published in:Chemical engineering journal (Lausanne, Switzerland : 1996) Switzerland : 1996), 2020-07, Vol.392, p.123673, Article 123673
Main Authors: Wu, Meiyan, Sukyai, Prakit, Lv, Dong, Zhang, Fang, Wang, Peidong, Liu, Chao, Li, Bin
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Language:English
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cited_by cdi_FETCH-LOGICAL-c297t-a2a721364ea5674c4606d1be25bf6a6522383893d1d1c7ff0471ffeef06d36113
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container_start_page 123673
container_title Chemical engineering journal (Lausanne, Switzerland : 1996)
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creator Wu, Meiyan
Sukyai, Prakit
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Li, Bin
description [Display omitted] •A robust and water-induced shape memory CNP was prepared with CNFs and CS.•Fast response to water of the CNP is due to synergistic hydration of CS and CNFs.•The final CNP shows excellent wet strength and folding endurance.•The final CNP exhibits amazing barrier and antibacterial properties.•The final CNP has potential use in humidity sensor, packaging, medicine, etc. 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 (
doi_str_mv 10.1016/j.cej.2019.123673
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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 (&lt;3 s) and humidity (&lt;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. 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source ScienceDirect Freedom Collection 2022-2024
subjects Cellulose nanofibrils
Cellulose nanopaper
Chitosan
Humidity sensitivity
Shape memory
title Water and humidity-induced shape memory cellulose nanopaper with quick response, excellent wet strength and folding resistance
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