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Title: Mechanical enhancement of cellulose nanofibril (CNF) films through the addition of water-soluble polymers

Source: Cellulose

Author(s)Forti, Endrina S.; El Awad Azrak, Sami M.; Ng, Xin Y.; Cho, Whirang ; Schueneman, Gregory T.; Moon, Robert J.; Fox, Douglas M.; Youngblood, Jeffrey P.

Publication Year: 2021  View PDF »

Category: Journal Articles
Associated Research Project(s):   FPL-4707-3C

Abstract: In this work, water-soluble polymers were screened through solution casting and polyvinyl alcohol (PVA) and poly(2-ethyl-2-oxazoline) (PEOX) were found as reinforcement agents for cellulose nanofibril (CNF) films. Mechanical property increases of 99% in elastic modulus, 93% in the ultimate tensile strength (UTS) and 134% in the work of failure (WOF) were reported for TEMPO-oxidized cellulose nanofibrils (TOCNFs) with 0.44 mmol/g carboxylate groups and 15 wt% PVA. PEOX had a higher elastic modulus increase of 113%, yet lower UTS and WOF increases were found at 63% and 28%, respectively. Additionally, increases in UTS and elastic modulus were also seen in mechanically fibrillated CNFs and TOCNFs with higher carboxylate contents (1.5 mmol/ g). The toughening mechanism was attributed to the formation of strong hydrogen bonding between the CNFs and the hydrophilic polymers added. The presence of such mechanisms was indirectly confirmed by tensile testing, zeta potential and rheology.

Keywords: Cellulose nanofibers; polyvinyl alcohol; poly(2-ethyl-2-oxazoline); tensile properties; composite film

Publication Review Process: Formally Refereed

File size: 1,024 kb(s)

Date posted: 09/02/2021

This publication is also viewable on Treesearch:  view
RITS Product ID: 10232
Current FPL Scientists associated with this product (listed alphabetically)
Moon, Robert J.
Materials Research Engineer
Schueneman, Gregory
Supervisory Research Materials Engineer
 

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