University of Oulu

Niskanen, I., Zhang, K., Karzarjeddi, M. et al. Optical Properties of Cellulose Nanofibre Films at High Temperatures. J Polym Res 29, 187 (2022).

Optical properties of cellulose nanofibre films at high temperatures

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Author: Niskanen, Ilpo1; Zhang, Kaitao2; Karzarjeddi, Mohammad2;
Organizations: 1Faculty of Technology, Structures and Construction Technology, University of Oulu, P.O. Box 7300, 90014, Oulu, Finland
2Faculty of Technology, Fibre and Particle Engineering, University of Oulu, P.O. Box 4300, 90014, Oulu, Finland
3Graduate School of Engineering, Utsunomiya University, 7-1-2 Yoto, Utsunomiya, Tochigi, 321-8585, Japan
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 2.3 MB)
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Language: English
Published: Springer Nature, 2022
Publish Date: 2022-07-01


Nanocelluloses and their different designs, such as films and nanopapers, have gained considerable interest in many application areas due to their unique properties. For many purposes, such as packaging and electronics, the thermal stability and optical properties of nanocellulose materials are crucial characteristics. In this study, the effects of heat treatment (100 ºC, 150 ºC and 200 ºC) on the optical and mechanical properties of 2,2,6,6-tetramethylpiperidinyl-1-oxy radical-oxidised cellulose nanofibre (TO-CNF) films were investigated, especially the alteration of the colour, complex refractive index and birefringence. Exposing TO-CNF films to high temperatures (> 150 ºC) induced permanent transformations in the CNF structure, leading to an increase in the refractive index, decreases in the birefringence and crystallinity index, colour darkening and significant deterioration of the mechanical properties.

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Series: Journal of polymer research
ISSN: 1022-9760
ISSN-E: 1572-8935
ISSN-L: 1022-9760
Volume: 28
Issue: 5
Article number: 187
DOI: 10.1007/s10965-022-03019-0
Type of Publication: A1 Journal article – refereed
Field of Science: 221 Nanotechnology
Funding: We gratefully acknowledge funding from Academy of Finland ACNF projects (325276). Open Access funding provided by University of Oulu including Oulu University Hospital.
Academy of Finland Grant Number: 325276
Detailed Information: 325276 (Academy of Finland Funding decision)
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