Flexible and Tough Cellulose Nanocrystal/Polycaprolactone
Hybrid Aerogel Based on the Strategy of Macromolecule Cross-Linking
via Click Chemistry
Ling Zhou
Yuan-Ming Zhai
Ming-Bo Yang
Wei Yang
10.1021/acssuschemeng.9b03640.s001
https://acs.figshare.com/articles/journal_contribution/Flexible_and_Tough_Cellulose_Nanocrystal_Polycaprolactone_Hybrid_Aerogel_Based_on_the_Strategy_of_Macromolecule_Cross-Linking_via_Click_Chemistry/9755183
Cellulose nanocrystal
(CNC) aerogel suffers from inherent brittleness,
owing to the rigidity of crystals and the limited mobility between
individual crystals. Conventional small molecule based cross-linking
improves the toughness of CNC aerogel, but can hardly improve its
flexibility. In this work, a macromolecule-based click cross-linking
strategy with polycaprolactone diol as the cross-linker is employed
to fabricate the CNC-PCL hybrid aerogel with enhanced toughness and
flexibility. The molar ratio of CNC/PCL and the concentration of hydrogel
are studied as the two key factors greatly affecting the mechanical
performance of CNC-PCL aerogel. The resulted CNC-PCL hybrid aerogels
show the highest compressive strength of 595 ± 100 kPa when the
molar ratio of CNC/PCL is 1:0.1 (CP-0.1) and the highest shape recovery
rate of 96.3 ± 2.5% when the molar ratio of CNC/PCL is 1:0.25
(CP-0.25). The surface polarity of CNC-PCL aerogel behaves as amphipathic
due to the introduction of hydrophobic PCL. The thermal stability
of CNC-PCL aerogel is also improved due to the high thermal stability
of PCL. Therefore, this work provides a guidance for the preparation
of nanomaterial-based aerogel with good mechanical properties and
functionality by introducing functional polymers via click chemistry.
2019-08-30 19:43:25
shape recovery rate
Click Chemistry Cellulose nanocrystal
CNC-PCL aerogel
CP
macromolecule-based click cross-linking strategy
molar ratio