Author:
Niskanen Ilpo,Zhang Kaitao,Karzarjeddi Mohammad,Liimatainen Henrikki,Shibata Shuhei,Hagen Nathan,Heikkilä Rauno,Yoda Hidehiko,Otani Yukitoshi
Abstract
AbstractNanocelluloses 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.
Graphical abstract
Funder
University of Oulu including Oulu University Hospital
Publisher
Springer Science and Business Media LLC
Subject
Materials Chemistry,Organic Chemistry,Polymers and Plastics
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