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Title: Self-assembled optically transparent cellulose nanofibril films: effect of nanofibril morphology and drying procedure

Source: Cellulose, Volume 22, 2015; pp. 1094–1102.

Author(s)Qing, Yan; Sabo, Ronald; Wu, Yiqiang; Zhu, J.Y.; Cai, Zhiyong

Publication Year: 2015  View PDF »

Category: Journal Articles
Associated Research Project(s):   FPL-4706-2B   FPL-4709-2B

Abstract: Cellulose nanofibril (CNF) films currently provide great opportunity in many applications with advantages of excellent mechanical strength, high light transmittance, and good barrier properties. However, processes for preparing CNFs are typically tedious and vary, along with their properties. Here, five preparation methods using various combinations of filtration, freeze-drying, and casting are applied to produce CNF films, and their major properties are compared. Three different types of CNFs having a range of fiber diameter and aspect ratio were examined using each of these five preparation methods. Because of limited hydrogen bonds and nanofibril arrangement, the freeze-dried CNF films displayed reduced mechanical strength and light transmittance compared to the other methods, although freeze-drying was relatively fast. Some effects of film production methods on measured crystallinity were also observed with freezedried samples having lower crystallinity than films similarly produced by filtration and drying. Freestanding CNF films produced by casting at room temperature required long times and mold growth was sometimes observed, but cast films made from 2,2,6,6- tetramethylpiperidine-1-oxyl radical-oxidized CNFs had the highest light transmittance of any samples. Filtration of CNF suspensions followed by air- or oven-drying produced films with minimal defects, high mechanical strength, and good light transmittance with relatively little effort. Therefore, this filtration procedure is recommended for producing CNF films.

Keywords: Cellulose nanofibrils; Self-assembled films; Filtration; Freeze-drying; Casting; Mechanical and optical properties

Publication Review Process: Formally Refereed

File size: 1,235 kb(s)

Date posted: 04/01/2015

This publication is also viewable on Treesearch:  view
RITS Product ID: 72550
Current FPL Scientists associated with this product (listed alphabetically)
Cai, Zhiyong
Supervisory Research Materials Engineer
Sabo, Ronald C.
Research Materials Engineer
Zhu, JunYong
Research General Engineer

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