NDLI: Biomimetic Reversible Heat-Stiffening Polymer Nanocomposites

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Biomimetic Reversible Heat-Stiffening Polymer Nanocomposites

Content Provider	Semantic Scholar
Author	Cudjoe, Elvis Khani, Shaghayegh Way, Amanda E. Hore, Michael J. A. Maia, João Manuel Borges Rowan, Stuart J.
Copyright Year	2017
Abstract	Inspired by the ability of the sea cucumber to (reversibly) increase the stiffness of its dermis upon exposure to a stimulus, we herein report a stimuli-responsive nanocomposite that can reversibly increase its stiffness upon exposure to warm water. Nanocomposites composed of cellulose nanocrystals (CNCs) that are grafted with a lower critical solution temperature (LCST) polymer embedded within a poly(vinyl acetate) (PVAc) matrix show a dramatic increase in modulus, for example, from 1 to 350 MPa upon exposure to warm water, the hypothesis being that grafting the polymers from the CNCs disrupts the interactions between the nanofibers and minimizes the mechanical reinforcement of the film. However, exposure to water above the LCST leads to the collapse of the polymer chains and subsequent stiffening of the nanocomposite as a result of the enhanced CNC interactions. Backing up this hypothesis are energy conserving dissipative particle dynamics (EDPD) simulations which show that the attractive interactions between CNCs are switched on upon the temperature-induced collapse of the grafted polymer chains, resulting in the formation of a percolating reinforcing network.
Starting Page	886
Ending Page	894
Page Count	9
File Format	PDF HTM / HTML
PubMed reference number	28852703v1
Alternate Webpage(s)	https://doi.org/10.1021/acscentsci.7b00215
DOI	10.1021/acscentsci.7b00215
Journal	ACS central science
Volume Number	3
Language	English
Access Restriction	Open
Subject Keyword	3-Mercaptopropionic Acid Biomimetics Cellulose Diphenhydramine Hydrochloride 20 MG/ML / Zinc Acetate 1 MG/ML Topical Cream Embedding Inspiration function Nanocomposites Nanocrystalline Materials Polymers
Content Type	Text
Resource Type	Article

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