Journal
MATERIALS & DESIGN
Volume 156, Issue -, Pages 398-406Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.matdes.2018.07.004
Keywords
Chitosan aerogels; Polyvinyl alcohol; Supramolecular interaction; Shrinkage; Control
Categories
Funding
- National Natural Science Foundation of China [51302317, 51702360]
- Natural Science Foundation of Hunan Province [14JJ3008]
- Key Project of Sichuan Provincial Research and Development [2017GZ0290]
- Project of Hunan Provincial Innovation Foundation for Postgraduate [CX2016B002]
- Project of Student Science and Technology Innovation of National University of Defense Technology
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Naturally-derived materials have attracted numerous attention owing to a unique native set of properties, but the significant shrinkage of biomass aerogel, from its final wet gel to aerogel, remains a formidable challenge. Here we explore a strategy based on supramolecular interaction and covalent crosslinking to overcome the inherent large shrinkage of chitosan aerogel, by reinforcing its molecular-level structure. The introduction of linear polyvinyl alcohol (PVA) chains can adequately interpenetrate with crosslinked chitosan chains to form strong intermolecular network architecture. Chitosan aerogel trussed with PVA enables to be readily fine-tuned, simultaneously giving rise to nano-sized cellular voids inside the aerogel. Chitosan aerogel obtained shows good heat insulation, applicable compressive property and exceptional processing feature of special-shaped components. We also find an emergent phenomenon that the addition of PVA may steer desirable orientation shrinkage, and linear elasticity at low strain in terms of chitosan aerogel. (C) 2018 Elsevier Ltd. All rights reserved.
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